循环打印视图(学习WHILE循环)

Posted 2020-10-17 Li Essay

--按变量赋值方式
DECLARE @ViewName VARCHAR(50)  --视图名
DECLARE @RowCount INT = 0      --总视图数
DECLARE @i INT = 0             --循环次数

SELECT @RowCount = COUNT(NAME) FROM sysobjects WHERE  xtype = ‘v‘

WHILE @i < @RowCount
BEGIN
    SELECT @ViewName = t1.NAME FROM(SELECT ROW_NUMBER() OVER(ORDER BY NAME) AS RowNum, NAME FROM sysobjects WHERE  xtype = ‘v‘ ) AS t1 WHERE  t1.RowNum = @i
    PRINT @ViewName
    SET @i = @i + 1
END

 

--按拼接Sql语句方式
DECLARE @ViewName VARCHAR(50)  --视图名
DECLARE @RowCount INT = 0      --总视图数
DECLARE @i INT = 0               --循环次数
DECLARE @sql VARCHAR(MAX)=‘‘

SELECT @RowCount = COUNT(NAME) FROM sysobjects WHERE  xtype = ‘v‘

WHILE @i < 10  --@RowCount
BEGIN
    SET @sql = ‘select t1.NAME FROM( SELECT ROW_NUMBER() OVER(ORDER BY NAME) AS RowNum, NAME FROM sysobjects WHERE  xtype = ‘+ ‘‘‘v‘+‘‘‘)t1 WHERE  t1.RowNum = ‘+ cast(@i AS VARCHAR)
    EXEC (@sql)
    SET @i = @i + 1
END