Spring mybatis 调用存储过程

存储过程在程序开发中常常用到。存储过程具备安全，高效，运行速度快等特色，在mybatis中能够调用存储过程。接下来的例子是根据分类ID查询当前分类下全部商品的数量

---建立存储过程，IN表示输入参数  OUT表示输出参数
DELIMITER $
CREATE PROCEDURE GetSkuCountProc (IN categoryId INT, OUT count_num INT )  
    BEGIN  
        SELECT COUNT(0) INTO count_num  
        FROM skus s INNER JOIN category  c ON s.categoryid=c.id
        WHERE c.Id=categoryId;
    END 
$

---调用存储过程
DELIMITER ;
SET @count = 0;
    CALL GetSkuCountProc(6, @count);
SELECT @count;

配置Mapper.xml文件

<select id="getSkuCount" parameterMap="getSkuCountMap" statementType="CALLABLE">
    CALL GetSkuCountProc(?,?)
</select>
<parameterMap type="java.util.Map" id="getSkuCountMap">
    <parameter property="categoryId" mode="IN" jdbcType="INTEGER"/>
    <parameter property="count_num" mode="OUT" jdbcType="INTEGER"/>
</parameterMap>

调用存储过程

@RequestMapping(value="GetSkuCount")
public String GetSkuCount()
{
    String resource = "/conf.xml";
    //加载mybatis的配置文件
    InputStream inputstream = this.getClass().getResourceAsStream(resource);
               
    SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputstream);
              
    SqlSession session = sessionFactory.openSession();
               
    String statesql= "mapping.skusMapper.getSkuCount";    //在skusMapper.xml中有命名空间+方法名
                
    Map<String, Integer> map = new HashMap<String, Integer>();
    map.put("categoryId",6);
    map.put("count_num", -1);
    session.selectOne(statesql, map);
    Integer result = map.get("count_num");
    System.out.println(result);
    
    return "index";
}