解决的方法是在remove之前释放掉QSqlQuery和QSqlDatabase这些个资源,最好的方式就是像上面一样让其工作在一个作用域,离开这个作用域就会自动释放了。 {QSqlDatabase db=QSqlDatabase::database("sales");QSqlQueryquery("SELECT NAME, DOB FROM EMPLOYEES",db);}/
Delete From Statement The DELETE FROM statement in SQL is used to remove records from a table. Please note that the DELETE FROM command cannot delete any rows of data that would violate FOREIGN KEY or other constraints. SyntaxThe syntax for the DELETE FROM statement is as follows: ...
Using SQL Server Management Studio Using Transact-SQL Follow Up: Removing Database Mirroring Show 2 more Applies to: SQL Server This topic describes how to remove database mirroring from a database in SQL Server by using SQL Server Management Studio or Transact-SQL. At any time, the data...
QSqlDatabase db = QSqlDatabase::database("sales"); QSqlQuery query("SELECT NAME, DOB FROM EMPLOYEES", db); QSqlDatabase::removeDatabase("sales");// will output a warning // "db" is now a dangling invalid database connection, // "query" contains an invalid result set The correct ...
Remove-SqlAvailabilityDatabase cmdlet 从其可用性组中删除可用性数据库。 InputObject 或 Path 参数指定可用性数据库。 如果在承载主副本的服务器实例上运行此 cmdlet,该 cmdlet 将从可用性组中删除主数据库和所有相应的辅助数据库。 如果在托管辅助副本
从SQL Server 的可用性组中删除一个或多个 SharePoint 数据库。语法PowerShell 复制 Remove-DatabaseFromAvailabilityGroup [-AGName] <String> [-AssignmentCollection <SPAssignmentCollection>] -DatabaseName <String> [-Force] [-KeepSecondaryData] [<CommonParameters>]...
:removeDatabase: connection 'myConnectionName‘仍在使用中，所有查询将停止工作import csv from ...
QSqlDatabase db = QSqlDatabase::database("sales"); 1. QSqlQuery query("SELECT NAME, DOB FROM EMPLOYEES", db); 1. } 1. // Both "db" and "query" are destroyed because they are out of scope 1. QSqlDatabase::removeDatabase("sales"); // correct ...
Using SQL Server Management Studio Using Transact-SQL Show 3 more Applies to: SQL Server This topic describes how to remove both the primary database and the corresponding secondary database(s) from an Always On availability group by using SQL Server Management Studio, Transact-SQL, or Power...
Remove-AzureRmSqlDatabase cmdlet 删除 Azure SQL 数据库。 Azure 上的 SQL Server Stretch Database 服务也支持此 cmdlet。