批量更改数据库指定字段类型

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* * Decription: 用于修改处理数据表字段类型 *    1) 要求先删除对应字段的默认约束 *       2) 修改字段类型，重新添加默认约束 *    3) 修改配置表的信息为 INPUT 类型
ALTER TABLE PdStandardArtMain DROP CONSTRAINT DF_PdStandardArtMain_Is_TransferAXGOALTER TABLE PdStandardArtMain ALTER COLUMN Is_TransferAX INT GOALTER TABLE PdStandardArtMain ADD CONSTRAINT DF_PdStandardArtMain_Is_TransferAX DEFAULT 0 FOR Is_TransferAX  GO
********** 需要处理的数据库 ********** * 请手动更改 USE 下的几个数据库
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USE DB
GO
DECLARE @Table_Name   NVARCHAR(50) = N''DECLARE @Column_Name  NVARCHAR(50) = N'Is_TransferAX'DECLARE @Constraint_Name NVARCHAR(100) = N''DECLARE @SQLCMD    NVARCHAR(2000) = N''DECLARE @strCRLF   NVARCHAR(10)   = NCHAR(13) + NCHAR(10)
--查找当前数据库下所有表 Is_TransferAX 字段的类型SELECT ST.[name] AS "Table_Name", SC.[name] AS "Column_Name", SD.definition AS "Default_Value", SD.[name] AS "Constraint_Name"  INTO #tmp_ReTypeColumn FROM sys.tables ST INNER JOIN sys.syscolumns SC ON ST.[object_id] = SC.[id]   INNER JOIN sys.default_constraints SD ON ST.[object_id] = SD.[parent_object_id] AND SC.colid = SD.parent_column_id  WHERE SC.NAME = 'Is_TransferAX'   ORDER BY ST.[name], SC.colid
--用一个本地游标来处理DECLARE cur_ReTypeColumn CURSOR LOCAL FOR SELECT Table_Name, Column_Name, Constraint_Name FROM #tmp_ReTypeColumn
OPEN cur_ReTypeColumn fetch next from cur_ReTypeColumn INTO @Table_Name, @Column_Name, @Constraint_Namewhile @@fetch_Status=0 begin SET @SQLCMD += N' ALTER TABLE dbo.' + @Table_Name +           N' DROP CONSTRAINT ' + @Constraint_Name +        N' ;' + @strCRLF +       N' ALTER TABLE dbo.' + @Table_Name +        N' ALTER COLUMN ' + @Column_Name + N' INT ' +        N' ;' + @strCRLF +       N' ALTER TABLE dbo.' + @Table_Name +        N' ADD CONSTRAINT DF_' + @Table_Name + @Column_Name + N' DEFAULT 0 FOR ' + @Column_Name + N';' + @strCRLF +       N' ' + @strCRLF    fetch next from cur_ReTypeColumn INTO @Table_Name, @Column_Name, @Constraint_Nameend
CLOSE cur_ReTypeColumn DEALLOCATE cur_ReTypeColumn
--开始更新到正式库BEGIN TRANEXEC (@SQLCMD)
--同步配置表的信息为普通类型，不是CheckBox类型UPDATE systemdb..pbTableFieldList SET Type='INPUT' WHERE Table_Name='pbYarnBasalProcess' AND Field_Name = 'Is_TransferAX'UPDATE systemdb..pbTableFieldList SET Type='INPUT' WHERE Table_Name='pbYarnProcessList' AND Field_Name = 'Is_TransferAX' UPDATE systemdb..pbTableFieldList SET Type='INPUT' WHERE Table_Name='pbYarnBasalComp' AND Field_Name = 'Is_TransferAX'UPDATE systemdb..pbTableFieldList SET Type='INPUT' WHERE Table_Name='pbYarnCompList' AND Field_Name = 'Is_TransferAX'
UPDATE systemdb..pbTableFieldList SET Type='INPUT' WHERE Table_Name='pbYarnProductList' AND Field_Name = 'Is_TransferAX'UPDATE systemdb..pbTableFieldList SET Type='INPUT' WHERE Table_Name='pbYarnTypeMapping' AND Field_Name = 'Is_TransferAX' UPDATE systemdb..pbTableFieldList SET Type='INPUT' WHERE Table_Name='pbYarnContentList' AND Field_Name = 'Is_TransferAX'UPDATE systemdb..pbTableFieldList SET Type='INPUT' WHERE Table_Name='pbYarnCountList' AND Field_Name = 'Is_TransferAX'
IF @@ERROR<>0 BEGIN   ROLLBACK   PRINT N'更新过程中出现错误，请检查....'  + @strCRLF   PRINT @strCRLF + @SQLCMD + @strCRLF   ENDELSEBEGIN  COMMIT PRINT @strCRLF + N'处理完成....'END
DROP TABLE #tmp_ReTypeColumn
RETURN