Goto语句是微软的SQL Server关系数据库提供了非常实用的编程控制语句,可以帮助开发人员实现复杂的逻辑控制。它有三种用法,分别是“跳转到指定标记”,“跳转到当前请求域”和“跳转到新请求域”。 Goto语句可用于提高存储过程、触发器和脚本的可读性,简化编程模型,减少冗余代码,实现数据库逻辑控制等。Goto语句有助于减少...
存储过程是一组 Transact-SQL 语句,它们只需编译一次,以后即可多次执行。因为 Transact-SQL 语句不需要重新编译,所以执行存储过程可以提高性能。 触发器是一种特殊的存储过程,不由用户直接调用。创建触发器时,将其定义为在对特定表或列进行特定类型的数据修改时激发。 存储过程的设计规则 CREATE PROCEDURE 定义自身可以...
以mssql为例,通过下列通用命令可以方便查询出数据库结构: usepubsgo--查询数据库全部表名SELECTTABLE_NAMEFROMINFORMATION_SCHEMA.TABLESWHERETABLE_TYPE='BASE TABLE'--查询数据库全部视图名SELECTTABLE_NAMEFROMINFORMATION_SCHEMA.TABLESWHERETABLE_TYPE='VIEW'--查询数据库全部表和视图字段的设置SELECT--TABLE_CATALOG ...
T-SQL陈述式中有几个有用的程序设计结构关键词,能用来控制程序流程。这些结构可用于批处理(一次执行一组T-SQL陈述式)、预存程序、指令码和特别的查询(本节范例会使用pubs数据库)。 IF...ELSE IF...ELSE结构利用条件以决定将执行那一条T-SQL陈述式,语法如下: IFBoolean_expression T-SQL_statement | block_o...
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(ByVal Sh As Object, ByVal Target...ActiveSheet.UsedRange.Interior.ColorIndex = 0 Target.Interior.ColorIndex = 6 End If End Sub 在单元格里回车...{ Do | For | Function | Property | Select | Sub | Try | While } 参见 Exit Statement (Visual Basic) 参考 VBA...Converting Data Types ...
(ByVal Sh As Object, ByVal Target...ActiveSheet.UsedRange.Interior.ColorIndex = 0 Target.Interior.ColorIndex = 6 End If End Sub 在单元格里回车...{ Do | For | Function | Property | Select | Sub | Try | While } 参见 Exit Statement (Visual Basic) 参考 VBA...Converting Data Types ...
2.1.475 Part 1 Section 17.16.5.23, GOTOBUTTON 2.1.476 Part 1 Section 17.16.5.24, GREETINGLINE 2.1.477 Part 1 Section 17.16.5.25, HYPERLINK 2.1.478 Part 1 Section 17.16.5.26, IF 2.1.479 Part 1 Section 17.16.5.28, INCLUDETEXT 2.1.480 Part 1 Section 17.16.5.29, INDEX 2.1.481 Part ...
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