IRelationalCommand.ExecuteScalar 方法
定义
重要
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重载
ExecuteScalar(RelationalCommandParameterObject)
使用单个标量结果执行命令。
public object ExecuteScalar (Microsoft.EntityFrameworkCore.Storage.RelationalCommandParameterObject parameterObject);public object? ExecuteScalar (Microsoft.EntityFrameworkCore.Storage.RelationalCommandParameterObject parameterObject);abstract member ExecuteScalar : Microsoft.EntityFrameworkCore.Storage.RelationalCommandParameterObject -> objPublic Function ExecuteScalar (parameterObject As RelationalCommandParameterObject) As Object参数
- parameterObject
- RelationalCommandParameterObject
此方法的参数。
返回
命令的结果。
适用于
ExecuteScalar(IRelationalConnection, IReadOnlyDictionary<String,Object>)
使用单个标量结果执行命令。
public object ExecuteScalar (Microsoft.EntityFrameworkCore.Storage.IRelationalConnection connection, System.Collections.Generic.IReadOnlyDictionary<string,object> parameterValues);abstract member ExecuteScalar : Microsoft.EntityFrameworkCore.Storage.IRelationalConnection * System.Collections.Generic.IReadOnlyDictionary<string, obj> -> objPublic Function ExecuteScalar (connection As IRelationalConnection, parameterValues As IReadOnlyDictionary(Of String, Object)) As Object参数
- connection
- IRelationalConnection
要对其执行的连接。
- parameterValues
- IReadOnlyDictionary<String,Object>
参数的值。
返回
命令的结果。
适用于
ExecuteScalar(IRelationalConnection, IReadOnlyDictionary<String,Object>, Boolean)
注意
Use overload without 'manageConnection' parameter
使用单个标量结果执行命令。
public object ExecuteScalar (Microsoft.EntityFrameworkCore.Storage.IRelationalConnection connection, System.Collections.Generic.IReadOnlyDictionary<string,object> parameterValues = default, bool manageConnection = true);[System.Obsolete("Use overload without 'manageConnection' parameter")]
public object ExecuteScalar (Microsoft.EntityFrameworkCore.Storage.IRelationalConnection connection, System.Collections.Generic.IReadOnlyDictionary<string,object> parameterValues, bool manageConnection);abstract member ExecuteScalar : Microsoft.EntityFrameworkCore.Storage.IRelationalConnection * System.Collections.Generic.IReadOnlyDictionary<string, obj> * bool -> obj[<System.Obsolete("Use overload without 'manageConnection' parameter")>]
abstract member ExecuteScalar : Microsoft.EntityFrameworkCore.Storage.IRelationalConnection * System.Collections.Generic.IReadOnlyDictionary<string, obj> * bool -> objPublic Function ExecuteScalar (connection As IRelationalConnection, Optional parameterValues As IReadOnlyDictionary(Of String, Object) = Nothing, Optional manageConnection As Boolean = true) As ObjectPublic Function ExecuteScalar (connection As IRelationalConnection, parameterValues As IReadOnlyDictionary(Of String, Object), manageConnection As Boolean) As Object参数
- connection
- IRelationalConnection
要对其执行的连接。
- parameterValues
- IReadOnlyDictionary<String,Object>
参数的值。
- manageConnection
- Boolean
一个 值，该值指示是否根据需要打开和关闭连接。
返回
命令的结果。
- 属性
