将不同的表程序转换为IF

Question

我想根据每个参数接收的值选择一个表。是否有可能与我的代码类似？谢谢。

/ * PROCEDURE * /

BEGIN
    DECLARE text varchar(30);

    IF (type = 1) THEN  
        SET text = 'table1';
    ELSEIF (type  = 2) THEN
        SET text = 'table2';        
    ELSEIF (type  = 3) THEN
        SET text = 'table3';        
    ELSEIF (type  = 4) THEN
        SET text = 'table4';                
    END IF;

    Select * from text where `fee type` = var2;

END

Answer 1

查询与表的名称连接并在PREPARE中使用。

/ * PROCEDURE * /

BEGIN
    DECLARE text varchar(30);

    IF (type = 1) THEN  
        SET text = 'table1';
    ELSEIF (type  = 2) THEN
        SET text = 'table2';        
    ELSEIF (type  = 3) THEN
        SET text = 'table3';        
    ELSEIF (type  = 4) THEN
        SET text = 'table4';                
    END IF;

    SET @s = CONCAT('Select * from ',text,' where `fee type` = ?')
    PREPARE sentence FROM @s;
    SET @var1 = 2;
    EXECUTE sentence USING @var1;
    DEALLOCATE PREPARE sentence ;

END