mybatis如何遍历Map的key和value【增删改查】

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mybatis如何遍历Map的key和value

2017年11月28日 10:07:57 Joker_Ye 阅读数：4158

 

1.sql.xml

1. <?xml version="1.0" encoding="UTF-8"?>
2. <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
3. "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
4. <!--namespace必须是接口的全类名 -->
5. <mapper namespace="com.genius">
6.  
7. <!-- 1.0 查询表结构是否存在 -->
8. <select id="selectOne" parameterType="java.util.HashMap"
9. resultType="java.util.HashMap">
10. select count(*) as num from ${tableName} where seq =
11. #{seq};
12. </select>
13.  
14. <!-- 1.1 插入一条数据 -->
15. <insert id="insertOne" parameterType="java.util.Map">
16. insert into ${tableName}
17. <foreach collection="content.keys" item="key" open="(" close=")"
18. separator=",">
19. ${key}
20. </foreach>
21. values
22. <foreach collection="content.values" item="value" open="("
23. close=")" separator=",">
24. #{value}
25. </foreach>
26. </insert>
27.  
28. <!-- 1.2 更新记录 -->
29. <update id="updateOne" parameterType="java.util.Map">
30. UPDATE ${tableName} SET
31. <foreach collection="content.keys" item="key" open="" close=""
32. separator=",">
33. ${key} = #{content[${key}]}
34. </foreach>
35. where seq = #{content[seq]} and genius_uid <=
36. #{content[genius_uid]};
37. </update>
38.  
39. <!-- 1.3 删除无效数据 -->
40. <delete id="deleteOne" parameterType="java.util.Map">
41. delete from ${tableName}
42. where seq = #{content[seq]};
43. </delete>
44.  
45. </mapper>

2.java代码：

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