SQL基础：通过T-SQL语句创建游标与实现数据库加解密功能

通过动态SQL语句创建游标

DECLARE @sql varchar(100);
DECLARE @TableName varchar(32);
DECLARE @FieldName varchar(32);
DECLARE @PrimaryKey varchar(32);
DECLARE @DbValue varchar(32);
DECLARE @PKey int;

–赋值
set @TableName=’Student’;
SET @FieldName=’Name’;
SET @PrimaryKey=’Id’;
–创建动态游标
set @sql = ‘declare rowCursor cursor For select ‘+@PrimaryKey+’ as PKey , ‘+@FieldName
+’ as DbValue from ‘+@TableName;
EXEC(@sql);
–打开游标
OPEN rowCursor;
–取值
fetch next from rowCursor into @PKey,@DbValue;
–循环
while(@@FETCH_STATUS=0)
begin
declare @ExecSql varchar(100);
set @ExecSql=’Update ‘+@TableName +’ set ‘+@FieldName+’ = 234324324′;
PRINT @ExecSql
EXEC(@ExecSql)
fetch next from rowCursor into @PKey,@DbValue;
end
–关闭游标
close rowCursor;
–释放游标控件
deallocate rowCursor;