mybatis如何遍历Map的key和value代码,Java代码库,德仔网

代码语言

代码分类

【Java】 mybatis如何遍历Map的key和value

作者:壮壮 / 发布于2018/4/24/ 638

1.sql.xml

<?xml version="1.0" encoding="UTF-8"?>  
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"   
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">  
<!--namespace必须是接口的全类名 -->  
<mapper namespace="com.genius">  
  
    <!-- 1.0 查询表结构是否存在 -->  
    <select id="selectOne" parameterType="java.util.HashMap"  
        resultType="java.util.HashMap">  
        select count(*) as num from ${tableName} where seq =  
        #{seq};  
    </select>  
  
    <!-- 1.1 插入一条数据 -->  
    <insert id="insertOne" parameterType="java.util.Map">  
        insert into ${tableName}  
        <foreach collection="content.keys" item="key" open="(" close=")"  
            separator=",">  
            ${key}  
        </foreach>  
        values  
        <foreach collection="content.values" item="value" open="("  
            close=")" separator=",">  
            #{value}  
        </foreach>  
    </insert>  
  
    <!-- 1.2 更新记录 -->  
    <update id="updateOne" parameterType="java.util.Map">  
        UPDATE ${tableName} SET  
        <foreach collection="content.keys" item="key" open="" close=""  
            separator=",">  
            ${key} = #{content[${key}]}  
        </foreach>  
        where seq = #{content[seq]} and genius_uid <=  
        #{content[genius_uid]};  
    </update>  
  
    <!-- 1.3 删除无效数据 -->  
    <delete id="deleteOne" parameterType="java.util.Map">  
        delete from ${tableName}  
        where seq = #{content[seq]};  
    </delete>  
  
</mapper>  


2.java代码：

SqlSession session = MyBatisConnectionFactory.getSession("pg");  
                HashMap<String, Object> params = new HashMap<>(); //传入的参数  
                params.put("content", tableContent);  
                params.put("tableName", tableName);  
                params.put("seq", seq);  
int flag = session.delete("deleteOne", params); //删除记录  
HashMap<String, Object> map = session.selectOne("selectOne", params); //查询记录是否存在  
flag = session.update("updateOne", params) > 0 ? true : false; //更新  
flag = session.insert("insertOne", params) > 0 ? true : false; //新增

试试其它关键字

同语言下

可能有用的

壮壮贡献的其它代码(8)