業務背景：

機構ID：省（360000），市級（360100），區縣級（360101）

輸入一個機構ID（可能是區，也可能是市）在sys_ability_warning_rule表中查詢對應機構ID，

如：輸入360305（區縣級），

如果表中有對應ID，則直接返回360305，

如果沒有對應ID，則查詢有沒有市級ID（360300），如果有，則返回360300，

如果市級ID也沒有，則查詢省級ID（360000），如果有，則返回360000，

如果省級ID也沒有，則返回（000000）

方法一：循環法

CREATE PROCEDURE `getSchWarnRule`(IN organiz VARCHAR(20),OUT organiz_rule VARCHAR
 
(20))
BEGIN
    DECLARE sqlStr VARCHAR(4000) DEFAULT ‘‘;
    DECLARE leg INT DEFAULT 6;
    REPEAT
        SET sqlStr = CONCAT("select count(*) into @count from sys_ability_warning_rule wr where wr.organiz = ‘", organiz, "‘");
        SET @sql2 = sqlStr;
        PREPARE stat1 FROM @sql2;
        EXECUTE
 
 stat1;
        IF @count = 0 THEN
            SET leg = leg - 2;
            SET organiz = RPAD(LEFT(organiz,leg),6,0);
        END IF;
        UNTIL @count>=1 OR leg = 0
    END REPEAT;
    SET organiz_rule = organiz;
END

方法二：遞歸法

DROP PROCEDURE IF EXISTS `getSchWarnRule2`;
-- organiz 機構 
-- organiz_rule 有效機構
 

CREATE PROCEDURE getSchWarnRule2(IN organiz VARCHAR(20),OUT organiz_rule VARCHAR(20))
BEGIN
    DECLARE sqlStr VARCHAR(4000) DEFAULT ‘‘;
    DECLARE organiz_rule2 VARCHAR(20) DEFAULT ‘‘;
    DECLARE organiz2 VARCHAR(20) DEFAULT RPAD(organiz,6,0);
    IF organiz2!=‘000000‘ THEN
        SET sqlStr = CONCAT("select count(*) into @count from sys_ability_warning_rule wr where wr.organiz = ‘", organiz2, "‘");
        SET @sql2 = sqlStr;
        PREPARE stat1 FROM @sql2;
        EXECUTE stat1;
        IF @count=0 THEN
            call getSchWarnRule2(LEFT(organiz,CHAR_LENGTH(organiz)-2), organiz_rule2);
            SET organiz_rule = organiz_rule2;
        ELSEIF @count>=1 THEN
            SET organiz_rule = organiz;
        END IF;
    END IF;
END;

MyBatis調用：

WarnRuleMapper.java 接口

public interface WarnRuleMapper extends BaseMapper<SysAbilityWarningRule> {
    public String getSchWarnRule(Map map);
}

WarnRuleMapper.xml

<select id="getSchWarnRule" parameterType="java.util.Map" resultType="java.lang.String" statementType="CALLABLE" >
    {
        call getSchWarnRule(
            #{organiz,mode=IN,jdbcType=VARCHAR},
            #{organiz_rule,mode=OUT,jdbcType=VARCHAR}
        )
    }
</select>

然後再用Service層調用就OK了。

MyBatis調用MySQL存儲過程