Interface ISelect<T1>
Assembly: FreeSql.dll
Syntax
public interface ISelect<T1> : ISelect0<ISelect<T1>, T1>, ISelect0
Type Parameters
Methods
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Aggregate<TReturn>(Expression<Func<ISelectGroupingAggregate<T1>, TReturn>>, out TReturn)
执行SQL查询，返回指定字段的聚合结果给 output 参数
fsql.Select<T>()
.Aggregate(a => new { count = a.Count, sum = a.Sum(a.Key.Price) }, out var agg)
.Page(1, 10).ToList();
Declaration
ISelect<T1> Aggregate<TReturn>(Expression<Func<ISelectGroupingAggregate<T1>, TReturn>> select, out TReturn result)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<ISelectGroupingAggregate<T1>, TReturn>> |
select |
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| TReturn |
result |
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Returns
Type Parameters
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Any(Expression<Func<T1, Boolean>>)
Declaration
bool Any(Expression<Func<T1, bool>> exp)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, System.Boolean>> |
exp |
lambda表达式
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Returns
| Type |
Description |
| System.Boolean |
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AnyAsync(Expression<Func<T1, Boolean>>, CancellationToken)
Declaration
Task<bool> AnyAsync(Expression<Func<T1, bool>> exp, CancellationToken cancellationToken = default(CancellationToken))
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, System.Boolean>> |
exp |
|
| System.Threading.CancellationToken |
cancellationToken |
|
Returns
| Type |
Description |
| System.Threading.Tasks.Task<System.Boolean> |
|
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As(String)
Declaration
ISelect<T1> As(string alias = "a")
Parameters
| Type |
Name |
Description |
| System.String |
alias |
别名
|
Returns
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Avg<TMember>(Expression<Func<T1, TMember>>)
Declaration
double Avg<TMember>(Expression<Func<T1, TMember>> column)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TMember>> |
column |
列
|
Returns
| Type |
Description |
| System.Double |
|
Type Parameters
| Name |
Description |
| TMember |
返回类型
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AvgAsync<TMember>(Expression<Func<T1, TMember>>, CancellationToken)
Declaration
Task<double> AvgAsync<TMember>(Expression<Func<T1, TMember>> column, CancellationToken cancellationToken = default(CancellationToken))
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TMember>> |
column |
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| System.Threading.CancellationToken |
cancellationToken |
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Returns
| Type |
Description |
| System.Threading.Tasks.Task<System.Double> |
|
Type Parameters
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First<TDto>()
执行SQL查询，返回 TDto 映射的字段，记录不存在时返回 Dto 默认值
Declaration
Returns
Type Parameters
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First<TReturn>(Expression<Func<T1, TReturn>>)
执行SQL查询，返回指定字段的记录的第一条记录，记录不存在时返回 TReturn 默认值
Declaration
TReturn First<TReturn>(Expression<Func<T1, TReturn>> select)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TReturn>> |
select |
选择列
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Returns
Type Parameters
| Name |
Description |
| TReturn |
返回类型
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FirstAsync<TReturn>(Expression<Func<T1, TReturn>>, CancellationToken)
Declaration
Task<TReturn> FirstAsync<TReturn>(Expression<Func<T1, TReturn>> select, CancellationToken cancellationToken = default(CancellationToken))
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TReturn>> |
select |
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| System.Threading.CancellationToken |
cancellationToken |
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Returns
| Type |
Description |
| System.Threading.Tasks.Task<TReturn> |
|
Type Parameters
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FirstAsync<TDto>(CancellationToken)
Declaration
Task<TDto> FirstAsync<TDto>(CancellationToken cancellationToken = default(CancellationToken))
Parameters
| Type |
Name |
Description |
| System.Threading.CancellationToken |
cancellationToken |
|
Returns
| Type |
Description |
| System.Threading.Tasks.Task<TDto> |
|
Type Parameters
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From<T2>(Expression<Func<ISelectFromExpression<T1>, T2, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2> From<T2>(Expression<Func<ISelectFromExpression<T1>, T2, ISelectFromExpression<T1>>> exp = null)
where T2 : class
Parameters
Returns
Type Parameters
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From<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> From<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class where T10 : class where T11 : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, ISelectFromExpression<T1>>> |
exp |
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Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> |
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Type Parameters
| Name |
Description |
| T2 |
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| T3 |
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| T4 |
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| T5 |
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| T6 |
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| T7 |
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| T8 |
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| T9 |
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| T10 |
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| T11 |
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From<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> From<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class where T10 : class where T11 : class where T12 : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, ISelectFromExpression<T1>>> |
exp |
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Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> |
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Type Parameters
| Name |
Description |
| T2 |
|
| T3 |
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| T4 |
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| T5 |
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| T6 |
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| T7 |
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| T8 |
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| T9 |
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| T10 |
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| T11 |
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| T12 |
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From<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13> From<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class where T10 : class where T11 : class where T12 : class where T13 : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, ISelectFromExpression<T1>>> |
exp |
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Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13> |
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Type Parameters
| Name |
Description |
| T2 |
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| T3 |
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| T4 |
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| T5 |
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| T6 |
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| T7 |
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| T8 |
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| T9 |
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| T10 |
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| T11 |
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| T12 |
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| T13 |
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From<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14> From<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class where T10 : class where T11 : class where T12 : class where T13 : class where T14 : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, ISelectFromExpression<T1>>> |
exp |
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Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14> |
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Type Parameters
| Name |
Description |
| T2 |
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| T3 |
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| T4 |
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| T5 |
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| T6 |
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| T7 |
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| T8 |
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| T9 |
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| T10 |
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| T11 |
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| T12 |
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| T13 |
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| T14 |
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From<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15> From<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class where T10 : class where T11 : class where T12 : class where T13 : class where T14 : class where T15 : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, ISelectFromExpression<T1>>> |
exp |
|
Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15> |
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Type Parameters
| Name |
Description |
| T2 |
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| T3 |
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| T4 |
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| T5 |
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| T6 |
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| T7 |
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| T8 |
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| T9 |
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| T10 |
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| T11 |
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| T12 |
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| T13 |
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| T14 |
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| T15 |
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From<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16> From<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class where T10 : class where T11 : class where T12 : class where T13 : class where T14 : class where T15 : class where T16 : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, ISelectFromExpression<T1>>> |
exp |
|
Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16> |
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Type Parameters
| Name |
Description |
| T2 |
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| T3 |
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| T4 |
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| T5 |
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| T6 |
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| T7 |
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| T8 |
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| T9 |
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| T10 |
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| T11 |
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| T12 |
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| T13 |
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| T14 |
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| T15 |
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| T16 |
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From<T2, T3>(Expression<Func<ISelectFromExpression<T1>, T2, T3, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3> From<T2, T3>(Expression<Func<ISelectFromExpression<T1>, T2, T3, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class
Parameters
Returns
| Type |
Description |
| ISelect<T1, T2, T3> |
|
Type Parameters
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From<T2, T3, T4>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3, T4> From<T2, T3, T4>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class where T4 : class
Parameters
Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4> |
|
Type Parameters
| Name |
Description |
| T2 |
|
| T3 |
|
| T4 |
|
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From<T2, T3, T4, T5>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3, T4, T5> From<T2, T3, T4, T5>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class where T4 : class where T5 : class
Parameters
Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4, T5> |
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Type Parameters
| Name |
Description |
| T2 |
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| T3 |
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| T4 |
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| T5 |
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From<T2, T3, T4, T5, T6>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3, T4, T5, T6> From<T2, T3, T4, T5, T6>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class
Parameters
Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4, T5, T6> |
|
Type Parameters
| Name |
Description |
| T2 |
|
| T3 |
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| T4 |
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| T5 |
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| T6 |
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From<T2, T3, T4, T5, T6, T7>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3, T4, T5, T6, T7> From<T2, T3, T4, T5, T6, T7>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class
Parameters
Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4, T5, T6, T7> |
|
Type Parameters
| Name |
Description |
| T2 |
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| T3 |
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| T4 |
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| T5 |
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| T6 |
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| T7 |
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From<T2, T3, T4, T5, T6, T7, T8>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3, T4, T5, T6, T7, T8> From<T2, T3, T4, T5, T6, T7, T8>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class
Parameters
Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4, T5, T6, T7, T8> |
|
Type Parameters
| Name |
Description |
| T2 |
|
| T3 |
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| T4 |
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| T5 |
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| T6 |
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| T7 |
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| T8 |
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From<T2, T3, T4, T5, T6, T7, T8, T9>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9> From<T2, T3, T4, T5, T6, T7, T8, T9>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class
Parameters
Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9> |
|
Type Parameters
| Name |
Description |
| T2 |
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| T3 |
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| T4 |
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| T5 |
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| T6 |
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| T7 |
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| T8 |
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| T9 |
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From<T2, T3, T4, T5, T6, T7, T8, T9, T10>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, ISelectFromExpression<T1>>>)
Declaration
ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> From<T2, T3, T4, T5, T6, T7, T8, T9, T10>(Expression<Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, ISelectFromExpression<T1>>> exp = null)
where T2 : class where T3 : class where T4 : class where T5 : class where T6 : class where T7 : class where T8 : class where T9 : class where T10 : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<ISelectFromExpression<T1>, T2, T3, T4, T5, T6, T7, T8, T9, T10, ISelectFromExpression<T1>>> |
exp |
|
Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> |
|
Type Parameters
| Name |
Description |
| T2 |
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| T3 |
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| T4 |
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| T5 |
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| T6 |
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| T7 |
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| T8 |
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| T9 |
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| T10 |
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FromQuery<T2>(ISelect<T2>)
Declaration
ISelect<T1, T2> FromQuery<T2>(ISelect<T2> select2)
where T2 : class
Parameters
| Type |
Name |
Description |
| ISelect<T2> |
select2 |
|
Returns
Type Parameters
|
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FromQuery<T2, T3>(ISelect<T2>, ISelect<T3>)
Declaration
ISelect<T1, T2, T3> FromQuery<T2, T3>(ISelect<T2> select2, ISelect<T3> select3)
where T2 : class where T3 : class
Parameters
Returns
| Type |
Description |
| ISelect<T1, T2, T3> |
|
Type Parameters
|
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FromQuery<T2, T3, T4>(ISelect<T2>, ISelect<T3>, ISelect<T4>)
Declaration
ISelect<T1, T2, T3, T4> FromQuery<T2, T3, T4>(ISelect<T2> select2, ISelect<T3> select3, ISelect<T4> select4)
where T2 : class where T3 : class where T4 : class
Parameters
Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4> |
|
Type Parameters
| Name |
Description |
| T2 |
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| T3 |
|
| T4 |
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FromQuery<T2, T3, T4, T5>(ISelect<T2>, ISelect<T3>, ISelect<T4>, ISelect<T5>)
Declaration
ISelect<T1, T2, T3, T4, T5> FromQuery<T2, T3, T4, T5>(ISelect<T2> select2, ISelect<T3> select3, ISelect<T4> select4, ISelect<T5> select5)
where T2 : class where T3 : class where T4 : class where T5 : class
Parameters
Returns
| Type |
Description |
| ISelect<T1, T2, T3, T4, T5> |
|
Type Parameters
| Name |
Description |
| T2 |
|
| T3 |
|
| T4 |
|
| T5 |
|
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GroupBy<TKey>(Expression<Func<T1, TKey>>)
按选择的列分组，GroupBy(a => a.Name) | GroupBy(a => new{a.Name,a.Time})
Declaration
ISelectGrouping<TKey, T1> GroupBy<TKey>(Expression<Func<T1, TKey>> exp)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TKey>> |
exp |
|
Returns
Type Parameters
|
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Include<TNavigate>(Expression<Func<T1, TNavigate>>)
贪婪加载导航属性，如果查询中已经使用了 a.Parent.Parent 类似表达式，则可以无需此操作
Declaration
ISelect<T1> Include<TNavigate>(Expression<Func<T1, TNavigate>> navigateSelector)
where TNavigate : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TNavigate>> |
navigateSelector |
选择一个导航属性
|
Returns
Type Parameters
| Name |
Description |
| TNavigate |
|
|
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IncludeByPropertyName(String)
按属性名字符串进行 Include/IncludeMany 操作
Declaration
ISelect<T1> IncludeByPropertyName(string property)
Parameters
| Type |
Name |
Description |
| System.String |
property |
|
Returns
|
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IncludeByPropertyName(String, Expression<Action<ISelect<Object>>>)
Declaration
ISelect<T1> IncludeByPropertyName(string property, Expression<Action<ISelect<object>>> then)
Parameters
| Type |
Name |
Description |
| System.String |
property |
|
| System.Linq.Expressions.Expression<System.Action<ISelect<System.Object>>> |
then |
|
Returns
|
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IncludeByPropertyNameIf(Boolean, String)
按属性名字符串进行 Include/IncludeMany 操作
Declaration
ISelect<T1> IncludeByPropertyNameIf(bool condition, string property)
Parameters
| Type |
Name |
Description |
| System.Boolean |
condition |
true 时生效
|
| System.String |
property |
|
Returns
|
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IncludeByPropertyNameIf(Boolean, String, Expression<Action<ISelect<Object>>>)
Declaration
ISelect<T1> IncludeByPropertyNameIf(bool condition, string property, Expression<Action<ISelect<object>>> then)
Parameters
| Type |
Name |
Description |
| System.Boolean |
condition |
|
| System.String |
property |
|
| System.Linq.Expressions.Expression<System.Action<ISelect<System.Object>>> |
then |
|
Returns
|
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IncludeIf<TNavigate>(Boolean, Expression<Func<T1, TNavigate>>)
贪婪加载导航属性，如果查询中已经使用了 a.Parent.Parent 类似表达式，则可以无需此操作
Declaration
ISelect<T1> IncludeIf<TNavigate>(bool condition, Expression<Func<T1, TNavigate>> navigateSelector)
where TNavigate : class
Parameters
| Type |
Name |
Description |
| System.Boolean |
condition |
true 时生效
|
| System.Linq.Expressions.Expression<System.Func<T1, TNavigate>> |
navigateSelector |
选择一个导航属性
|
Returns
Type Parameters
| Name |
Description |
| TNavigate |
|
|
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IncludeMany<TNavigate>(Expression<Func<T1, IEnumerable<TNavigate>>>, Action<ISelect<TNavigate>>)
贪婪加载集合的导航属性，其实是分两次查询，ToList 后进行了数据重装
文档：https://github.com/dotnetcore/FreeSql/wiki/%E8%B4%AA%E5%A9%AA%E5%8A%A0%E8%BD%BD
Declaration
ISelect<T1> IncludeMany<TNavigate>(Expression<Func<T1, IEnumerable<TNavigate>>> navigateSelector, Action<ISelect<TNavigate>> then = null)
where TNavigate : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, System.Collections.Generic.IEnumerable<TNavigate>>> |
navigateSelector |
选择一个集合的导航属性，如： .IncludeMany(a => a.Tags)
可以 .Where 设置临时的关系映射，如： .IncludeMany(a => a.Tags.Where(tag => tag.TypeId == a.Id))
可以 .Take(5) 每个子集合只取5条，如： .IncludeMany(a => a.Tags.Take(5))
可以 .Select 设置只查询部分字段，如： (a => new TNavigate { Title = a.Title })
|
| System.Action<ISelect<TNavigate>> |
then |
即能 ThenInclude，还可以二次过滤（这个 EFCore 做不到？）
|
Returns
Type Parameters
| Name |
Description |
| TNavigate |
|
|
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InsertInto<TTargetEntity>(String, Expression<Func<T1, TTargetEntity>>)
将查询转换为 INSERT INTO tableName SELECT ... FROM t 执行插入
Declaration
int InsertInto<TTargetEntity>(string tableName, Expression<Func<T1, TTargetEntity>> select)
where TTargetEntity : class
Parameters
| Type |
Name |
Description |
| System.String |
tableName |
指定插入的表名，若为 null 则使用 TTargetEntity 实体表名
|
| System.Linq.Expressions.Expression<System.Func<T1, TTargetEntity>> |
select |
选择列
|
Returns
| Type |
Description |
| System.Int32 |
返回影响的行数
|
Type Parameters
| Name |
Description |
| TTargetEntity |
|
|
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InsertIntoAsync<TTargetEntity>(String, Expression<Func<T1, TTargetEntity>>, CancellationToken)
Declaration
Task<int> InsertIntoAsync<TTargetEntity>(string tableName, Expression<Func<T1, TTargetEntity>> select, CancellationToken cancellationToken = default(CancellationToken))
where TTargetEntity : class
Parameters
| Type |
Name |
Description |
| System.String |
tableName |
|
| System.Linq.Expressions.Expression<System.Func<T1, TTargetEntity>> |
select |
|
| System.Threading.CancellationToken |
cancellationToken |
|
Returns
| Type |
Description |
| System.Threading.Tasks.Task<System.Int32> |
|
Type Parameters
| Name |
Description |
| TTargetEntity |
|
|
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Max<TMember>(Expression<Func<T1, TMember>>)
Declaration
TMember Max<TMember>(Expression<Func<T1, TMember>> column)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TMember>> |
column |
列
|
Returns
Type Parameters
| Name |
Description |
| TMember |
返回类型
|
|
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MaxAsync<TMember>(Expression<Func<T1, TMember>>, CancellationToken)
Declaration
Task<TMember> MaxAsync<TMember>(Expression<Func<T1, TMember>> column, CancellationToken cancellationToken = default(CancellationToken))
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TMember>> |
column |
|
| System.Threading.CancellationToken |
cancellationToken |
|
Returns
| Type |
Description |
| System.Threading.Tasks.Task<TMember> |
|
Type Parameters
|
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Min<TMember>(Expression<Func<T1, TMember>>)
Declaration
TMember Min<TMember>(Expression<Func<T1, TMember>> column)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TMember>> |
column |
列
|
Returns
Type Parameters
| Name |
Description |
| TMember |
返回类型
|
|
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MinAsync<TMember>(Expression<Func<T1, TMember>>, CancellationToken)
Declaration
Task<TMember> MinAsync<TMember>(Expression<Func<T1, TMember>> column, CancellationToken cancellationToken = default(CancellationToken))
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TMember>> |
column |
|
| System.Threading.CancellationToken |
cancellationToken |
|
Returns
| Type |
Description |
| System.Threading.Tasks.Task<TMember> |
|
Type Parameters
|
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OrderBy<TMember>(Boolean, Expression<Func<T1, TMember>>)
按列排序，OrderBy(true, a => a.Time)
Declaration
ISelect<T1> OrderBy<TMember>(bool condition, Expression<Func<T1, TMember>> column)
Parameters
| Type |
Name |
Description |
| System.Boolean |
condition |
true 时生效
|
| System.Linq.Expressions.Expression<System.Func<T1, TMember>> |
column |
|
Returns
Type Parameters
|
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OrderBy<TMember>(Expression<Func<T1, TMember>>)
按列排序，OrderBy(a => a.Time)
Declaration
ISelect<T1> OrderBy<TMember>(Expression<Func<T1, TMember>> column)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TMember>> |
column |
|
Returns
Type Parameters
|
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OrderByDescending<TMember>(Boolean, Expression<Func<T1, TMember>>)
按列倒向排序，OrderByDescending(true, a => a.Time)
Declaration
ISelect<T1> OrderByDescending<TMember>(bool condition, Expression<Func<T1, TMember>> column)
Parameters
| Type |
Name |
Description |
| System.Boolean |
condition |
true 时生效
|
| System.Linq.Expressions.Expression<System.Func<T1, TMember>> |
column |
列
|
Returns
Type Parameters
|
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OrderByDescending<TMember>(Expression<Func<T1, TMember>>)
按列倒向排序，OrderByDescending(a => a.Time)
Declaration
ISelect<T1> OrderByDescending<TMember>(Expression<Func<T1, TMember>> column)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TMember>> |
column |
列
|
Returns
Type Parameters
|
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OrderByIf<TMember>(Boolean, Expression<Func<T1, TMember>>, Boolean)
按列排序，OrderByIf(true, a => a.Time)
Declaration
ISelect<T1> OrderByIf<TMember>(bool condition, Expression<Func<T1, TMember>> column, bool descending = false)
Parameters
| Type |
Name |
Description |
| System.Boolean |
condition |
true 时生效
|
| System.Linq.Expressions.Expression<System.Func<T1, TMember>> |
column |
|
| System.Boolean |
descending |
true: DESC, false: ASC
|
Returns
Type Parameters
|
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Sum<TMember>(Expression<Func<T1, TMember>>)
Declaration
decimal Sum<TMember>(Expression<Func<T1, TMember>> column)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TMember>> |
column |
列
|
Returns
| Type |
Description |
| System.Decimal |
|
Type Parameters
| Name |
Description |
| TMember |
返回类型
|
|
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SumAsync<TMember>(Expression<Func<T1, TMember>>, CancellationToken)
Declaration
Task<decimal> SumAsync<TMember>(Expression<Func<T1, TMember>> column, CancellationToken cancellationToken = default(CancellationToken))
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TMember>> |
column |
|
| System.Threading.CancellationToken |
cancellationToken |
|
Returns
| Type |
Description |
| System.Threading.Tasks.Task<System.Decimal> |
|
Type Parameters
|
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ToAggregate<TReturn>(Expression<Func<ISelectGroupingAggregate<T1>, TReturn>>)
Declaration
TReturn ToAggregate<TReturn>(Expression<Func<ISelectGroupingAggregate<T1>, TReturn>> select)
Parameters
Returns
Type Parameters
|
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ToAggregateAsync<TReturn>(Expression<Func<ISelectGroupingAggregate<T1>, TReturn>>, CancellationToken)
Declaration
Task<TReturn> ToAggregateAsync<TReturn>(Expression<Func<ISelectGroupingAggregate<T1>, TReturn>> select, CancellationToken cancellationToken = default(CancellationToken))
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<ISelectGroupingAggregate<T1>, TReturn>> |
select |
|
| System.Threading.CancellationToken |
cancellationToken |
|
Returns
| Type |
Description |
| System.Threading.Tasks.Task<TReturn> |
|
Type Parameters
|
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ToChunk<TReturn>(Expression<Func<T1, TReturn>>, Int32, Action<FetchCallbackArgs<List<TReturn>>>)
执行SQL查询，分块返回数据，可减少内存开销。比如读取10万条数据，每次返回100条处理。
Declaration
void ToChunk<TReturn>(Expression<Func<T1, TReturn>> select, int size, Action<FetchCallbackArgs<List<TReturn>>> done)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TReturn>> |
select |
选择列
|
| System.Int32 |
size |
数据块的大小
|
| System.Action<FetchCallbackArgs<System.Collections.Generic.List<TReturn>>> |
done |
处理数据块
|
Type Parameters
| Name |
Description |
| TReturn |
返回类型
|
|
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ToDataTable<TReturn>(Expression<Func<T1, TReturn>>)
Declaration
DataTable ToDataTable<TReturn>(Expression<Func<T1, TReturn>> select)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TReturn>> |
select |
|
Returns
| Type |
Description |
| System.Data.DataTable |
|
Type Parameters
|
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ToDataTableAsync<TReturn>(Expression<Func<T1, TReturn>>, CancellationToken)
Declaration
Task<DataTable> ToDataTableAsync<TReturn>(Expression<Func<T1, TReturn>> select, CancellationToken cancellationToken = default(CancellationToken))
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TReturn>> |
select |
|
| System.Threading.CancellationToken |
cancellationToken |
|
Returns
| Type |
Description |
| System.Threading.Tasks.Task<System.Data.DataTable> |
|
Type Parameters
|
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ToList<TDto>()
执行SQL查询，返回 TDto 映射的字段，记录不存在时返回 Count 为 0 的列表
Declaration
List<TDto> ToList<TDto>()
Returns
| Type |
Description |
| System.Collections.Generic.List<TDto> |
|
Type Parameters
|
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ToList<TReturn>(Expression<Func<T1, TReturn>>)
执行SQL查询，返回指定字段的记录，记录不存在时返回 Count 为 0 的列表
Declaration
List<TReturn> ToList<TReturn>(Expression<Func<T1, TReturn>> select)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TReturn>> |
select |
选择列
|
Returns
| Type |
Description |
| System.Collections.Generic.List<TReturn> |
|
Type Parameters
| Name |
Description |
| TReturn |
返回类型
|
|
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ToListAsync<TReturn>(Expression<Func<T1, TReturn>>, CancellationToken)
Declaration
Task<List<TReturn>> ToListAsync<TReturn>(Expression<Func<T1, TReturn>> select, CancellationToken cancellationToken = default(CancellationToken))
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TReturn>> |
select |
|
| System.Threading.CancellationToken |
cancellationToken |
|
Returns
| Type |
Description |
| System.Threading.Tasks.Task<System.Collections.Generic.List<TReturn>> |
|
Type Parameters
|
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ToListAsync<TDto>(CancellationToken)
Declaration
Task<List<TDto>> ToListAsync<TDto>(CancellationToken cancellationToken = default(CancellationToken))
Parameters
| Type |
Name |
Description |
| System.Threading.CancellationToken |
cancellationToken |
|
Returns
| Type |
Description |
| System.Threading.Tasks.Task<System.Collections.Generic.List<TDto>> |
|
Type Parameters
|
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ToOne<TDto>()
执行SQL查询，返回 TDto 映射的字段，记录不存在时返回 Dto 默认值
Declaration
Returns
Type Parameters
|
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ToOne<TReturn>(Expression<Func<T1, TReturn>>)
执行SQL查询，返回指定字段的记录的第一条记录，记录不存在时返回 TReturn 默认值
Declaration
TReturn ToOne<TReturn>(Expression<Func<T1, TReturn>> select)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TReturn>> |
select |
选择列
|
Returns
Type Parameters
| Name |
Description |
| TReturn |
返回类型
|
|
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ToOneAsync<TReturn>(Expression<Func<T1, TReturn>>, CancellationToken)
Declaration
Task<TReturn> ToOneAsync<TReturn>(Expression<Func<T1, TReturn>> select, CancellationToken cancellationToken = default(CancellationToken))
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TReturn>> |
select |
|
| System.Threading.CancellationToken |
cancellationToken |
|
Returns
| Type |
Description |
| System.Threading.Tasks.Task<TReturn> |
|
Type Parameters
|
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ToOneAsync<TDto>(CancellationToken)
Declaration
Task<TDto> ToOneAsync<TDto>(CancellationToken cancellationToken = default(CancellationToken))
Parameters
| Type |
Name |
Description |
| System.Threading.CancellationToken |
cancellationToken |
|
Returns
| Type |
Description |
| System.Threading.Tasks.Task<TDto> |
|
Type Parameters
|
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ToSql<TReturn>(Expression<Func<T1, TReturn>>, FieldAliasOptions)
Declaration
string ToSql<TReturn>(Expression<Func<T1, TReturn>> select, FieldAliasOptions fieldAlias = FieldAliasOptions.AsIndex)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TReturn>> |
select |
选择列
|
| FieldAliasOptions |
fieldAlias |
字段别名
|
Returns
| Type |
Description |
| System.String |
|
Type Parameters
| Name |
Description |
| TReturn |
返回类型
|
|
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UnionAll(ISelect<T1>[])
Declaration
ISelect<T1> UnionAll(params ISelect<T1>[] querys)
Parameters
| Type |
Name |
Description |
| ISelect<T1>[] |
querys |
|
Returns
|
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Where(Expression<Func<T1, Boolean>>)
查询条件，Where(a => a.Id > 10)，支持导航对象查询，Where(a => a.Author.Email == "2881099@qq.com")
Declaration
ISelect<T1> Where(Expression<Func<T1, bool>> exp)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, System.Boolean>> |
exp |
lambda表达式
|
Returns
|
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Where<T2>(Expression<Func<T2, Boolean>>)
Declaration
ISelect<T1> Where<T2>(Expression<Func<T2, bool>> exp)
where T2 : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T2, System.Boolean>> |
exp |
lambda表达式
|
Returns
Type Parameters
|
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Where<T2>(Expression<Func<T1, T2, Boolean>>)
Declaration
ISelect<T1> Where<T2>(Expression<Func<T1, T2, bool>> exp)
where T2 : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, T2, System.Boolean>> |
exp |
lambda表达式
|
Returns
Type Parameters
|
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Where<T2, T3>(Expression<Func<T1, T2, T3, Boolean>>)
Declaration
ISelect<T1> Where<T2, T3>(Expression<Func<T1, T2, T3, bool>> exp)
where T2 : class where T3 : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, T2, T3, System.Boolean>> |
exp |
lambda表达式
|
Returns
Type Parameters
|
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Where<T2, T3, T4>(Expression<Func<T1, T2, T3, T4, Boolean>>)
Declaration
ISelect<T1> Where<T2, T3, T4>(Expression<Func<T1, T2, T3, T4, bool>> exp)
where T2 : class where T3 : class where T4 : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, T2, T3, T4, System.Boolean>> |
exp |
lambda表达式
|
Returns
Type Parameters
| Name |
Description |
| T2 |
|
| T3 |
|
| T4 |
|
|
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Where<T2, T3, T4, T5>(Expression<Func<T1, T2, T3, T4, T5, Boolean>>)
Declaration
ISelect<T1> Where<T2, T3, T4, T5>(Expression<Func<T1, T2, T3, T4, T5, bool>> exp)
where T2 : class where T3 : class where T4 : class where T5 : class
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, T2, T3, T4, T5, System.Boolean>> |
exp |
lambda表达式
|
Returns
Type Parameters
| Name |
Description |
| T2 |
|
| T3 |
|
| T4 |
|
| T5 |
|
|
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WhereCascade(Expression<Func<T1, Boolean>>)
多表查询时，该方法标记后，表达式条件将对所有表进行附加
例如：软删除、租户，每个表都给条件，挺麻烦的
fsql.Select<T1>().LeftJoin<T2>(...).Where<T2>((t1, t2 => t1.IsDeleted == false && t2.IsDeleted == false)
修改：fsql.Select<T1>().LeftJoin<T2>(...).WhereCascade(t1 => t1.IsDeleted == false)
当其中的实体可附加表达式才会进行，表越多时收益越大
Declaration
ISelect<T1> WhereCascade(Expression<Func<T1, bool>> exp)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, System.Boolean>> |
exp |
|
Returns
|
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WhereDynamic(Object, Boolean)
传入动态条件，如：主键值 | new[]{主键值1,主键值2} | TEntity1 | new[]{TEntity1,TEntity2} | new{id=1}
Declaration
ISelect<T1> WhereDynamic(object dywhere, bool not = false)
Parameters
| Type |
Name |
Description |
| System.Object |
dywhere |
主键值、主键值集合、实体、实体集合、匿名对象、匿名对象集合
|
| System.Boolean |
not |
是否标识为NOT
|
Returns
|
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WhereIf(Boolean, Expression<Func<T1, Boolean>>)
查询条件，Where(true, a => a.Id > 10)，支导航对象查询，Where(true, a => a.Author.Email == "2881099@qq.com")
Declaration
ISelect<T1> WhereIf(bool condition, Expression<Func<T1, bool>> exp)
Parameters
| Type |
Name |
Description |
| System.Boolean |
condition |
true 时生效
|
| System.Linq.Expressions.Expression<System.Func<T1, System.Boolean>> |
exp |
lambda表达式
|
Returns
|
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WithMemory(IEnumerable<T1>)
实现 select .. from ( select .. UNION ALL select .. ) a 这样的功能（基于内存数据）
Declaration
ISelect<T1> WithMemory(IEnumerable<T1> source)
Parameters
| Type |
Name |
Description |
| System.Collections.Generic.IEnumerable<T1> |
source |
内存数据
|
Returns
|
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WithSql(String, Object)
实现 select .. from ( select ... from t ) a 这样的功能
使用 AsTable 方法也可以达到效果
示例：WithSql("select * from id=@id", new { id = 1 })
提示：parms 参数还可以传 Dictionary<string, object>
Declaration
ISelect<T1> WithSql(string sql, object parms = null)
Parameters
| Type |
Name |
Description |
| System.String |
sql |
SQL语句
|
| System.Object |
parms |
参数
|
Returns
|
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WithTempQuery<TDto>(Expression<Func<T1, TDto>>)
嵌套查询 select * from ( select ... from table ... ) a
Declaration
ISelect<TDto> WithTempQuery<TDto>(Expression<Func<T1, TDto>> selector)
Parameters
| Type |
Name |
Description |
| System.Linq.Expressions.Expression<System.Func<T1, TDto>> |
selector |
|
Returns
Type Parameters
Extension Methods
FreeSqlGlobalExtensions.OrderByRandom<TSelect, T1>(FreeSql.ISelect0<TSelect, T1>)