Can I have a primary key as a non-unique column Can I pass parameter to an ALTER DATABASE command Can I prevent deadlock during concurrent delete Can I print to file using T- SQL Can I sort an SQL table? Can I sort row without order by clause Can I UPDATE, then INSERT if no rec...
cmd.CommandType = commandType; cmd.Parameters.AddRange(parameters); conn.Open(); return cmd.ExecuteNonQuery(); } } } // Set the connection, command, and then execute the command and only return one value. public static Object ExecuteScalar(String connectionString, String commandText, CommandType ...
SQL Server 维护关联统计信息,其中 FOREIGN KEY 约束链接数据库中的任意两个表,并且这些表具有 datetime 列。 OFF 不会维护相关统计信息。 若要将 DATE_CORRELATION_OPTIMIZATION 设置为 ON,则除执行 ALTER DATABASE 语句的连接以外,该数据库还必须没有其他活动连接。 以后会支持多个连接。 可通过查看 is_date_corr...
CreateTableCustTest ( CustIDintprimarykey, CustNamevarchar(20) )InsertintoCustTestvalues(1,'John') 代码示例 1:自动生成的命令 SELECT如果检索用于填充 aDataSet的数据的语句基于单个数据库表,则可以利用CommandBuilder该对象自动生成UpdateCommandDeleteCommandInsertCommand和属性。DataAdapter这简化了和减少执行INSERT、...
(SELECT name from sys.certificates WHERE name = @sqlserver_certificate_name) BEGIN PRINT (@create_sqlserver_certificate_command) -- Execute the query to create SQL Server certificate for the instance link EXEC sp_executesql @stmt = @create_sqlserver_certificate_command END ELSE PR...
Can't connect to SQL Server Integration Services Can't deploy SSIS Package due to "deploy_project_internal" Can't see my user variables in Connection Manager cannot change Run64bitRuntime Cannot change SQL command text in Data Flow Task Cannot convert 'System.String' to 'System.Boolean' Canno...
insertedKey.Direction = ParameterDirection.Output; e.Command.Parameters.Add(insertedKey); }privatevoidOn_Inserted(Object sender, SqlDataSourceStatusEventArgs e){ DbCommand command = e.Command;// The label displays the primary key of the recently inserted row.Label1.Text = command.Parameters["@PK_...
insertedKey.Direction = ParameterDirection.Output; e.Command.Parameters.Add(insertedKey); }privatevoidOn_Inserted(Object sender, SqlDataSourceStatusEventArgs e){ DbCommand command = e.Command;// The label displays the primary key of the recently inserted row.Label1.Text = command.Parameters["@PK_...
PK = PRIMARY KEY 约束(类型是 K) RF = 复制筛选存储过程 S = 系统表 TF = 表函数 TR = 触发器 U = 用户表 UQ = UNIQUE 约束(类型是 K) V = 视图 X = 扩展存储过程 查询所有的数据库名: selectnamefrommaster.dbo.sysdatabases; 查询字段 ...
报错:DELETE command denied to user 'userName'@'*.*.*.*' for table 'table_name' 报错:java.io.EOFException: SSL peer shut down incorrectly 报错:binlog probably contains events generated with statement or mixed based replication format 报错:java.lang.ClassCastException: org.codehaus.janino.Compiler...