如何使用 Dynamic Sql 遍历模式中的表

Question

我有一个 table 的数据库，我想在 3 种不同的模式中遍历每个 table，一次一个模式。

我想我需要一些类似的东西：

DECLARE @tableName varchar(50)

DECLARE @schemaName varchar(50)

现在让我们调用模式 "A" "B" 和 "C".

我可以使用以下方法从每个模式中获取 table 的列表：

SELECT t.name 
  FROM sys.tables AS t
  INNER JOIN sys.schemas AS s
  ON t.[schema_id] = s.[schema_id]
  WHERE s.name = N'schema_name';

但我不确定如何遍历该列表（我喜欢将值一个一个地插入到每个 table 中，并且它们取决于 table 的列的数据类型所以我不能只在所有声明中做一揽子插入）。

Answer 1

DECLARE @SchemaName SYSNAME = 'dbo'

DECLARE @TableName SYSNAME
--note sysname is the same thing as NVARCHAR()

DECLARE CursorName CURSOR FOR
SELECT t.name 
  FROM sys.tables AS t
  INNER JOIN sys.schemas AS s
  ON t.[schema_id] = s.[schema_id]
  WHERE s.name = @SchemaName;

OPEN CursorName

FETCH NEXT FROM CursorName
INTO @TableName

    WHILE @@FETCH_STATUS = 0
    BEGIN

       DECLARE @Columns NVARCHAR(MAX)
       SET @Columns = 
       STUFF(
          (SELECT
             ',' + QUOTENAME(name)
          FROM
             sys.columns
          WHERE
             object_id = OBJECT_ID(QUOTENAME(@SchemaName) + '.' + QUOTENAME(@TableName))
          FOR XML PATH(''))
          ,1,1,'')

        DECLARE @SQL AS NVARCHAR(MAX)
        SET @SQL = 'INSERT INTO ' + QUOTENAME(@SchemaName) + '.' + QUOTENAME(@TableName) + 
                    ' (' + @Columns + ') VALUES (' + 
                    'YOU MAKE REST DEPENDING ON YOUR NEEDS'

        --use print to view and copy your dynamic sql string to see if you have formed it correctly
        PRINT @SQL
        --EXECUTE (@SQL)

        FETCH NEXT FROM CursorName
        INTO @TableName
    END

CLOSE CursorName
DEALLOCATE CursorName

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