Interface ISelect0<TSelect, T1>

Namespace: FreeSql
Assembly: FreeSql.dll
Syntax
public interface ISelect0<TSelect, T1> : ISelect0
Type Parameters
Name Description
TSelect
T1

Methods

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Any()

执行SQL查询，是否有记录

Declaration
bool Any()
Returns
Type Description
System.Boolean
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AnyAsync(CancellationToken)

Declaration
Task<bool> AnyAsync(CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<System.Boolean>
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AsAlias(Func<Type, String, String>)

设置别名规则，可用于拦截表别名，实现类似 sqlserver 的 with(nolock) 需求

如：select.AsAlias((_, old) => $"{old} with(lock)")

Declaration
TSelect AsAlias(Func<Type, string, string> aliasRule)
Parameters
Type Name Description
System.Func<System.Type, System.String, System.String> aliasRule
Returns
Type Description
TSelect
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AsTable(Func<Type, String, String>)

设置表名规则，可用于分库/分表，参数1：实体类型；参数2：默认表名；返回值：新表名；

设置多次，可查询分表后的多个子表记录，以 UNION ALL 形式执行。

如：select.AsTable((type, oldname) => "table_1").AsTable((type, oldname) => "table_2").AsTable((type, oldname) => "table_3").ToSql(a => a.Id);

select * from (SELECT a."Id" as1 FROM "table_1" a) ftb

UNION ALL select * from (SELECT a."Id" as1 FROM "table_2" a) ftb

UNION ALL select * from (SELECT a."Id" as1 FROM "table_3" a) ftb

还可以这样：select.AsTable((a, b) => "(select * from tb_topic where clicks > 10)").Page(1, 10).ToList()

Declaration
TSelect AsTable(Func<Type, string, string> tableRule)
Parameters
Type Name Description
System.Func<System.Type, System.String, System.String> tableRule
Returns
Type Description
TSelect
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AsType(Type)

动态Type，在使用 Select<object> 后使用本方法，指定实体类型

Declaration
TSelect AsType(Type entityType)
Parameters
Type Name Description
System.Type entityType
Returns
Type Description
TSelect
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Cancel(Func<Boolean>)

控制取消本次查询

  • 不会产生额外的异常

  • 取消成功，则不执行 SQL 命令

  • 取消成功，直接返回没有记录时候的返回值

  • 取消成功，如 List<T> 返回 0 元素列表，不是 null，仍然是旧机制

Declaration
TSelect Cancel(Func<bool> cancel)
Parameters
Type Name Description
System.Func<System.Boolean> cancel

返回 true，则不会执行 SQL 命令
Returns
Type Description
TSelect
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CommandTimeout(Int32)

命令超时设置(秒)

Declaration
TSelect CommandTimeout(int timeout)
Parameters
Type Name Description
System.Int32 timeout
Returns
Type Description
TSelect
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Count()

查询的记录数量

Declaration
long Count()
Returns
Type Description
System.Int64
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Count(out Int64)

查询的记录数量，以参数out形式返回

Declaration
TSelect Count(out long count)
Parameters
Type Name Description
System.Int64 count

返回的变量
Returns
Type Description
TSelect
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CountAsync(CancellationToken)

Declaration
Task<long> CountAsync(CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<System.Int64>
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DisableGlobalFilter(String[])

禁用全局过滤功能，不传参数时将禁用所有

Declaration
TSelect DisableGlobalFilter(params string[] name)
Parameters
Type Name Description
System.String[] name

零个或多个过滤器名字
Returns
Type Description
TSelect
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Distinct()

查询数据前，去重

.Distinct().ToList(x => x.GroupName) 对指定字段去重

.Distinct().ToList() 对整个查询去重

Declaration
TSelect Distinct()
Returns
Type Description
TSelect
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First()

执行SQL查询，返回 T1 实体所有字段的第一条记录，记录不存在时返回 null

Declaration
T1 First()
Returns
Type Description
T1
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FirstAsync(CancellationToken)

Declaration
Task<T1> FirstAsync(CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<T1>
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ForUpdate(Boolean)

排他更新锁

注意：务必在开启事务后使用该功能

MySql: for update

SqlServer: With(UpdLock, RowLock, NoWait)

PostgreSQL: for update nowait

Oracle: for update nowait

Sqlite: 无效果

达梦: for update nowait

人大金仓: for update nowait

神通: for update

Declaration
TSelect ForUpdate(bool nowait = false)
Parameters
Type Name Description
System.Boolean nowait

noawait
Returns
Type Description
TSelect
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GroupBy(String, Object)

按原生sql语法分组，GroupBy("concat(name, @cc)&quot;, new { cc = 1 })

提示：parms 参数还可以传 Dictionary<string, object>

Declaration
TSelect GroupBy(string sql, object parms = null)
Parameters
Type Name Description
System.String sql

sql语法
System.Object parms

参数
Returns
Type Description
TSelect
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Having(String, Object)

按原生sql语法聚合条件过滤，Having("count(name) = @cc&quot;, new { cc = 1 })

提示：parms 参数还可以传 Dictionary<string, object>

Declaration
TSelect Having(string sql, object parms = null)
Parameters
Type Name Description
System.String sql

sql语法条件
System.Object parms

参数
Returns
Type Description
TSelect
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InnerJoin(Expression<Func<T1, Boolean>>)

联接查询，使用导航属性自动生成SQL

Declaration
TSelect InnerJoin(Expression<Func<T1, bool>> exp)
Parameters
Type Name Description
System.Linq.Expressions.Expression<System.Func<T1, System.Boolean>> exp

表达式
Returns
Type Description
TSelect
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InnerJoin(String, Object)

联接查询，使用原生sql语法，InnerJoin("type b on b.id = a.id and b.clicks > @clicks&quot;, new { clicks = 1 })

提示：parms 参数还可以传 Dictionary<string, object>

Declaration
TSelect InnerJoin(string sql, object parms = null)
Parameters
Type Name Description
System.String sql

sql语法条件
System.Object parms

参数
Returns
Type Description
TSelect
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InnerJoin<T2>(Expression<Func<T1, T2, Boolean>>)

联接查询，指定关联的实体类型

Declaration
TSelect InnerJoin<T2>(Expression<Func<T1, T2, bool>> exp)
Parameters
Type Name Description
System.Linq.Expressions.Expression<System.Func<T1, T2, System.Boolean>> exp

表达式
Returns
Type Description
TSelect
Type Parameters
Name Description
T2

关联的实体类型
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LeftJoin(Expression<Func<T1, Boolean>>)

左联查询，使用导航属性自动生成SQL

Declaration
TSelect LeftJoin(Expression<Func<T1, bool>> exp)
Parameters
Type Name Description
System.Linq.Expressions.Expression<System.Func<T1, System.Boolean>> exp

表达式
Returns
Type Description
TSelect
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LeftJoin(String, Object)

左联查询，使用原生sql语法，LeftJoin("type b on b.id = a.id and b.clicks > @clicks&quot;, new { clicks = 1 })

提示：parms 参数还可以传 Dictionary<string, object>

Declaration
TSelect LeftJoin(string sql, object parms = null)
Parameters
Type Name Description
System.String sql

sql语法条件
System.Object parms

参数
Returns
Type Description
TSelect
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LeftJoin<T2>(Expression<Func<T1, T2, Boolean>>)

左联查询，指定关联的实体类型

Declaration
TSelect LeftJoin<T2>(Expression<Func<T1, T2, bool>> exp)
Parameters
Type Name Description
System.Linq.Expressions.Expression<System.Func<T1, T2, System.Boolean>> exp

表达式
Returns
Type Description
TSelect
Type Parameters
Name Description
T2

关联的实体类型
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Limit(Int32)

查询多少条数据

Declaration
TSelect Limit(int limit)
Parameters
Type Name Description
System.Int32 limit
Returns
Type Description
TSelect
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Master()

指定从主库查询（默认查询从库）

Declaration
TSelect Master()
Returns
Type Description
TSelect
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Offset(Int32)

查询向后偏移行数

Declaration
TSelect Offset(int offset)
Parameters
Type Name Description
System.Int32 offset

行数
Returns
Type Description
TSelect
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OrderBy(Boolean, String, Object)

按原生sql语法排序，OrderBy(true, "count(name) + @cc desc", new { cc = 1 })

提示：parms 参数还可以传 Dictionary<string, object>

Declaration
TSelect OrderBy(bool condition, string sql, object parms = null)
Parameters
Type Name Description
System.Boolean condition

true 时生效
System.String sql

sql语法
System.Object parms

参数
Returns
Type Description
TSelect
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OrderBy(String, Object)

按原生sql语法排序，OrderBy("count(name) + @cc desc", new { cc = 1 })

提示：parms 参数还可以传 Dictionary<string, object>

Declaration
TSelect OrderBy(string sql, object parms = null)
Parameters
Type Name Description
System.String sql

sql语法
System.Object parms

参数
Returns
Type Description
TSelect
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OrderByPropertyName(String, Boolean)

按属性名字符串排序（支持导航属性）

属性名：Name

导航属性：Parent.Name

多表：b.Name

Declaration
TSelect OrderByPropertyName(string property, bool isAscending = true)
Parameters
Type Name Description
System.String property

属性名：Name

导航属性：Parent.Name

多表：b.Name
System.Boolean isAscending

顺序 | 倒序
Returns
Type Description
TSelect
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OrderByPropertyNameIf(Boolean, String, Boolean)

按属性名字符串排序（支持导航属性）

属性名：Name

导航属性：Parent.Name

多表：b.Name

Declaration
TSelect OrderByPropertyNameIf(bool condition, string property, bool isAscending = true)
Parameters
Type Name Description
System.Boolean condition

true 时生效
System.String property

属性名：Name

导航属性：Parent.Name

多表：b.Name
System.Boolean isAscending

顺序 | 倒序
Returns
Type Description
TSelect
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Page(BasePagingInfo)

分页

Declaration
TSelect Page(BasePagingInfo pagingInfo)
Parameters
Type Name Description
BasePagingInfo pagingInfo

分页信息
Returns
Type Description
TSelect
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Page(Int32, Int32)

分页

Declaration
TSelect Page(int pageNumber, int pageSize)
Parameters
Type Name Description
System.Int32 pageNumber

第几页
System.Int32 pageSize

每页多少
Returns
Type Description
TSelect
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RawJoin(String)

在 JOIN 位置插入 SQL 内容

如：.RawJoin("OUTER APPLY ( select id from t2 ) b")

Declaration
TSelect RawJoin(string sql)
Parameters
Type Name Description
System.String sql
Returns
Type Description
TSelect
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RightJoin(Expression<Func<T1, Boolean>>)

右联查询，使用导航属性自动生成SQL

Declaration
TSelect RightJoin(Expression<Func<T1, bool>> exp)
Parameters
Type Name Description
System.Linq.Expressions.Expression<System.Func<T1, System.Boolean>> exp

表达式
Returns
Type Description
TSelect
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RightJoin(String, Object)

右联查询，使用原生sql语法，RightJoin("type b on b.id = a.id and b.clicks > @clicks&quot;, new { clicks = 1 })

提示：parms 参数还可以传 Dictionary<string, object>

Declaration
TSelect RightJoin(string sql, object parms = null)
Parameters
Type Name Description
System.String sql

sql语法条件
System.Object parms

参数
Returns
Type Description
TSelect
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RightJoin<T2>(Expression<Func<T1, T2, Boolean>>)

右联查询，指定关联的实体类型

Declaration
TSelect RightJoin<T2>(Expression<Func<T1, T2, bool>> exp)
Parameters
Type Name Description
System.Linq.Expressions.Expression<System.Func<T1, T2, System.Boolean>> exp

表达式
Returns
Type Description
TSelect
Type Parameters
Name Description
T2

关联的实体类型
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Skip(Int32)

查询向后偏移行数

Declaration
TSelect Skip(int offset)
Parameters
Type Name Description
System.Int32 offset
Returns
Type Description
TSelect
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Take(Int32)

查询多少条数据

Declaration
TSelect Take(int limit)
Parameters
Type Name Description
System.Int32 limit
Returns
Type Description
TSelect
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ToChunk(Int32, Action<FetchCallbackArgs<List<T1>>>, Boolean)

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(int size, Action<FetchCallbackArgs<List<T1>>> done, bool includeNestedMembers = false)
Parameters
Type Name Description
System.Int32 size

数据块的大小
System.Action<FetchCallbackArgs<System.Collections.Generic.List<T1>>> done

处理数据块
System.Boolean includeNestedMembers

false: 返回 2级 LeftJoin/InnerJoin/RightJoin 对象；true: 返回所有 LeftJoin/InnerJoin/RightJoin 的导航数据
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ToDataTable(String)

执行SQL查询，返回 DataTable

Declaration
DataTable ToDataTable(string field = null)
Parameters
Type Name Description
System.String field
Returns
Type Description
System.Data.DataTable
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ToDataTableAsync(String, CancellationToken)

Declaration
Task<DataTable> ToDataTableAsync(string field = null, CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.String field
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<System.Data.DataTable>
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ToDataTableByPropertyName(String[])

执行SQL查询，返回 properties 指定的实体类属性，并以 DataTable 接收

Declaration
DataTable ToDataTableByPropertyName(string[] properties)
Parameters
Type Name Description
System.String[] properties

属性名：Name

导航属性：Parent.Name

多表：b.Name
Returns
Type Description
System.Data.DataTable
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ToDataTableByPropertyNameAsync(String[], CancellationToken)

Declaration
Task<DataTable> ToDataTableByPropertyNameAsync(string[] properties, CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.String[] properties
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<System.Data.DataTable>
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ToDelete()

将查询转为删除对象，以便支持导航对象或其他查询功能删除数据，如下：

fsql.Select<T1>().Where(a => a.Options.xxx == 1).ToDelete().ExecuteAffrows()

注意：此方法不是将数据查询到内存循环删除，上面的代码产生如下 SQL 执行：

DELETE FROM T1 WHERE id in (select a.id from T1 a left join Options b on b.t1id = a.id where b.xxx = 1)

复杂删除使用该方案的好处：

1、删除前可预览测试数据，防止错误删除操作；

2、支持更加复杂的删除操作（IDelete 默认只支持简单的操作）；

Declaration
IDelete<T1> ToDelete()
Returns
Type Description
IDelete<T1>
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ToDictionary<TKey>(Func<T1, TKey>)

以字典的形式返回查询结果

注意：字典的特点会导致返回的数据无序

Declaration
Dictionary<TKey, T1> ToDictionary<TKey>(Func<T1, TKey> keySelector)
Parameters
Type Name Description
System.Func<T1, TKey> keySelector
Returns
Type Description
System.Collections.Generic.Dictionary<TKey, T1>
Type Parameters
Name Description
TKey
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ToDictionary<TKey, TElement>(Func<T1, TKey>, Func<T1, TElement>)

Declaration
Dictionary<TKey, TElement> ToDictionary<TKey, TElement>(Func<T1, TKey> keySelector, Func<T1, TElement> elementSelector)
Parameters
Type Name Description
System.Func<T1, TKey> keySelector
System.Func<T1, TElement> elementSelector
Returns
Type Description
System.Collections.Generic.Dictionary<TKey, TElement>
Type Parameters
Name Description
TKey
TElement
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ToDictionaryAsync<TKey>(Func<T1, TKey>, CancellationToken)

Declaration
Task<Dictionary<TKey, T1>> ToDictionaryAsync<TKey>(Func<T1, TKey> keySelector, CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.Func<T1, TKey> keySelector
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<TKey, T1>>
Type Parameters
Name Description
TKey
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ToDictionaryAsync<TKey, TElement>(Func<T1, TKey>, Func<T1, TElement>, CancellationToken)

Declaration
Task<Dictionary<TKey, TElement>> ToDictionaryAsync<TKey, TElement>(Func<T1, TKey> keySelector, Func<T1, TElement> elementSelector, CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.Func<T1, TKey> keySelector
System.Func<T1, TElement> elementSelector
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<System.Collections.Generic.Dictionary<TKey, TElement>>
Type Parameters
Name Description
TKey
TElement
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ToList()

执行SQL查询，返回 T1 实体所有字段的记录，记录不存在时返回 Count 为 0 的列表

注意：

1、ToList(a => a) 可以返回 a 所有实体

2、ToList(a => new { a }) 这样也可以

3、ToList((a, b, c) => new { a, b, c }) 这样也可以

4、abc 怎么来的？请试试 fsql.Select<T1, T2, T3>()

Declaration
List<T1> ToList()
Returns
Type Description
System.Collections.Generic.List<T1>
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ToList(Boolean)

执行SQL查询，返回 T1 实体、以及 LeftJoin/InnerJoin/RightJoin 对象

Declaration
List<T1> ToList(bool includeNestedMembers)
Parameters
Type Name Description
System.Boolean includeNestedMembers

false: 返回 2级 LeftJoin/InnerJoin/RightJoin 对象；true: 返回所有 LeftJoin/InnerJoin/RightJoin 的导航数据
Returns
Type Description
System.Collections.Generic.List<T1>
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ToList<TTuple>(String)

执行SQL查询，返回 field 指定字段的记录，并以元组或基础类型(int,string,long)接收，记录不存在时返回 Count 为 0 的列表

Declaration
List<TTuple> ToList<TTuple>(string field)
Parameters
Type Name Description
System.String field
Returns
Type Description
System.Collections.Generic.List<TTuple>
Type Parameters
Name Description
TTuple
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ToListAsync(Boolean, CancellationToken)

Declaration
Task<List<T1>> ToListAsync(bool includeNestedMembers, CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.Boolean includeNestedMembers
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<System.Collections.Generic.List<T1>>
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ToListAsync(CancellationToken)

Declaration
Task<List<T1>> ToListAsync(CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<System.Collections.Generic.List<T1>>
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ToListAsync<TTuple>(String, CancellationToken)

Declaration
Task<List<TTuple>> ToListAsync<TTuple>(string field, CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.String field
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<System.Collections.Generic.List<TTuple>>
Type Parameters
Name Description
TTuple
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ToOne()

执行SQL查询，返回 T1 实体所有字段的第一条记录，记录不存在时返回 null

Declaration
T1 ToOne()
Returns
Type Description
T1
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ToOneAsync(CancellationToken)

Declaration
Task<T1> ToOneAsync(CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<T1>
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ToSql(String)

返回即将执行的SQL语句

Declaration
string ToSql(string field = null)
Parameters
Type Name Description
System.String field

指定字段
Returns
Type Description
System.String
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ToUpdate()

将查询转为更新对象，以便支持导航对象或其他查询功能更新数据，如下：

fsql.Select<T1>().Where(a => a.Options.xxx == 1).ToUpdate().Set(a => a.Title, "111").ExecuteAffrows()

注意：此方法不是将数据查询到内存循环更新，上面的代码产生如下 SQL 执行：

UPDATE T1 SET Title = '111' WHERE id in (select a.id from T1 a left join Options b on b.t1id = a.id where b.xxx = 1)

复杂更新使用该方案的好处：

1、更新前可预览测试数据，防止错误更新操作；

2、支持更加复杂的更新操作（IUpdate 默认只支持简单的操作）；

Declaration
IUpdate<T1> ToUpdate()
Returns
Type Description
IUpdate<T1>
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TrackToList(Action<Object>)

审核或跟踪 ToList 即将返回的数据

Declaration
TSelect TrackToList(Action<object> action)
Parameters
Type Name Description
System.Action<System.Object> action
Returns
Type Description
TSelect
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Where(String, Object)

原生sql语法条件，Where("id = @id&quot;, new { id = 1 })

提示：parms 参数还可以传 Dictionary<string, object>

Declaration
TSelect Where(string sql, object parms = null)
Parameters
Type Name Description
System.String sql

sql语法条件
System.Object parms

参数
Returns
Type Description
TSelect
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WhereDynamicFilter(DynamicFilterInfo)

动态过滤条件

Declaration
TSelect WhereDynamicFilter(DynamicFilterInfo filter)
Parameters
Type Name Description
DynamicFilterInfo filter
Returns
Type Description
TSelect
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WhereIf(Boolean, String, Object)

原生sql语法条件，WhereIf(true, "id = @id&quot;, new { id = 1 })

提示：parms 参数还可以传 Dictionary<string, object>

Declaration
TSelect WhereIf(bool condition, string sql, object parms = null)
Parameters
Type Name Description
System.Boolean condition

true 时生效
System.String sql

sql语法条件
System.Object parms

参数
Returns
Type Description
TSelect
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WithConnection(DbConnection)

指定连接对象

Declaration
TSelect WithConnection(DbConnection connection)
Parameters
Type Name Description
System.Data.Common.DbConnection connection
Returns
Type Description
TSelect
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WithParameters(List<DbParameter>)

使用自定义参数化，UnionALL 或者 ToSql 可能有需要

Declaration
TSelect WithParameters(List<DbParameter> parameters)
Parameters
Type Name Description
System.Collections.Generic.List<System.Data.Common.DbParameter> parameters
Returns
Type Description
TSelect
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WithTransaction(DbTransaction)

指定事务对象

Declaration
TSelect WithTransaction(DbTransaction transaction)
Parameters
Type Name Description
System.Data.Common.DbTransaction transaction
Returns
Type Description
TSelect