Sql 动态游标和WHERE子句Teradata

我试图编写一个过程，其中数据库名是动态的，并且取自where子句。 到目前为止，我已经做到了：

CREATE PROCEDURE Test

(IN DBName VARCHAR(100), OUT RowCount DEC(10,2))

BEGIN

DECLARE SqlStr VARCHAR(1000);

DECLARE C1 CURSOR FOR S1;

SET SqlStr = 'SELECT count(*) FROM '|| DBNAME || '.MyTable ';

PREPARE S1 FROM SqlStr;

OPEN C1 USING DBName;

FETCH C1 INTO RowCount;

CLOSE C1;

END;

我现在需要添加如下内容：

WHERE DBName = (SELECT 'firstpart||EnvName||' FROM EnvTable 
WHERE EnvName = (SELECT EnvName FROM EnvTable WHERE Flag = 1 AND Priority = (SELECT MIN(Priority) FROM EnvTable))

---

有什么想法吗？我可以在调用过程时添加这个吗？

听起来您只需要一个变量就可以使其更具动态性：

CREATE PROCEDURE Test

(OUT RowCount DEC(10,2))

BEGIN

    DECLARE SqlStr VARCHAR(1000);
    DECLARE DBName VARCHAR(100);
    DECLARE C1 CURSOR FOR S1;

    /*Get your DBName variable loaded using SELECT INTO*/   
    SELECT 'firstpart' || EnvName INTO DBName
    FROM EnvTable 
    WHERE Flag = 1 AND Priority = (SELECT MIN(Priority) FROM EnvTable);

    /*and continue what you were doing*/
    SET SqlStr = 'SELECT count(*) FROM '|| DBName || '.MyTable ';

    PREPARE S1 FROM SqlStr;

    OPEN C1 USING DBName;

        FETCH C1 INTO RowCount;

    CLOSE C1;

END;

---

我不知道你想用

firstpart | | envname

做什么，但这应该会让你明白。基本上，您只需要编写一条sql语句，使您的

dbname

变量成为变量，然后在第二次查询中使用它。

您想这样做吗？非常感谢，这非常有用：）