2019-01-22_Mybatis关于mysql简单操作学习

Mybatis关于mysql简单操作学习
1.概述
对mybatis常用的操作命令做一下总结,数据库基于mysql。后面章节会涉及数据的批量插入、批量更新和更新后返回主键ID等内容。
1.数据库信息
1.1.表结构定义
CREATE TABLE users (
id int(11) NOT NULL AUTO_INCREMENT,
NAME varchar(20) DEFAULT NULL,
age int(11) DEFAULT NULL,
remark varchar(200) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=682 DEFAULT CHARSET=utf8;
1.2.数据库配置db.properties
mysql.driver=com.mysql.jdbc.Driver
需要开启多行执行功能 jdbc:mysql://localhost:3306/mybatis?userUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&autoReconnect=true&failOverReadOnly=false" jdbc:mysql://localhost:3306/mybatis?userUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=UTC&allowMultiQueries=true" mysql.url=jdbc:mysql://localhost:3306/mybatis?userUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
mysql.username=root
mysql.password=123456
1.3.实体类
package com.tech.ability.mybatis.Entity;
/**

  • Created by kikop on 2019/1/17.
    */
    public class MyUser {
    //实体类的属性和表的字段名称一一对应
    private int id;
    private String name;
    private int age;
    public String getRemark() {
    return remark;
    }
    public void setRemark(String remark) {
    this.remark = remark;
    }
    private String remark;
    public int getId() {
    return id;
    }
    public void setId(int id) {
    this.id = id;
    }
    public String getName() {
    return name;
    }
    public void setName(String name) {
    this.name = name;
    }
    public int getAge() {
    return age;
    }
    public void setAge(int age) {
    this.age = age;
    }
    @Override
    public String toString() {
    return "MyUser{" +
    "age=" + age +
    ", id=" + id +
    ", name='" + name + ''' +
    ", remark='" + remark + ''' +
    '}';
    }
}
2.mybatis mapper接口文件
package com.tech.ability.mybatis.Mapper;
import com.alibaba.fastjson.JSONObject;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.SelectKey;
import org.springframework.data.repository.query.Param;
/**
  • Created by kikop on 2019/5/19.
    */
    public interface MyUserMapper {
}
3.mybatis sqlmap映射文件








select * from users where id=#{intid}

select * from users where id in (#{strQueryIds})select * from users where id in #{id} select * from users where id in ${id}


4.mybatis工具类
package com.tech.ability.mybatis;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.InputStream;
/**
  • Created by kikop on 2019/5/19.
    */
    public class mybatisUtils {
    //mybatis核心配置文件
    private static final String mybatis_configPath = "mybatisconfig.xml";
/** * 读取SqlSession * * @return */ public static SqlSession getSqlSession(ExecutorType execType, boolean isAutoCommit) {SqlSession sqlSession = null; try { //1.读取mybatis的配置文件 //String resource = "mybatisconfig.xml"; //2.构建sqlSession的工厂 //使用类加载器加载 mybatis 的 classspath中配置文件 InputStream inputStream = null;

// InputStream inputStream = mybatisTest.class.getClassLoader().getResourceAsStream(resource);
inputStream = Resources.getResourceAsStream(mybatis_configPath);
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
//2.构建sqlSession的工厂 //使用MyBatis提供的Resources类加载mybatis的配置文件(它也加载关联的映射文件) //Reader reader = Resources.getResourceAsReader(resource); //SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader); //3.创建能执行映射文件中sql的sqlSession

// sqlSession = sessionFactory.openSession(isAutoCommit);
sqlSession = sessionFactory.openSession(execType, isAutoCommit);
} catch (IOException e) { e.printStackTrace(); }return sqlSession; }/** * 关闭session(回收连接池必须) * * @param session */ public static void closeSqlSession(SqlSession session) { session.close(); }/** * 关闭inputStream * * @param inputStream */ public static void closeInputSream(InputStream inputStream) { try { inputStream.close(); } catch (IOException e) { e.printStackTrace(); } }

}
5.测试代码
5.1.测试1
package com.tech.ability.mybatis;
import com.alibaba.fastjson.JSONObject;
import com.tech.ability.mybatis.Entity.MyUser;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.SqlSession;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import java.util.ArrayList;
import java.util.List;
/**
  • Created by kikop on 2019/1/17.
    */
    public class mybatisTest {
    private static final Logger logger = LogManager.getLogger(mybatisTest.class);
    /**
    • getUserInfoByIDTest
      */
      public static void getUserInfoByIDTest() {
      //1.构建sqlSession
      SqlSession session = mybatisUtils.getSqlSession(ExecutorType.SIMPLE, false);
      //2.映射sql的标识字符串
      //String statement = "com.skill.tech.mybatis.Mapper.MyUserMapper.getUserInfoByID"; //映射sql的标识字符串
      StringBuffer statement = new StringBuffer();
      statement.append("com.tech.ability.mybatis.Mapper.MyUserMapper"); //mapper标签的namespace属性的值
      statement.append(".getUserInfoByID"); //select标签的id属性值
      //3.定义查询条件
      int intid = 2;
      //4.执行查询返回一个唯一user对象的sql
      MyUser myUser = session.selectOne(statement.toString(), intid);
      mybatisUtils.closeSqlSession(session);
      //5.输出结果
      System.out.println(myUser);
    【2019-01-22_Mybatis关于mysql简单操作学习】}
    5.2.测试2
    /**
    • getUserInfoByInTest
      */
      private static void getUserInfoByInTest() {
      //1.构建sqlSession
      SqlSession session = mybatisUtils.getSqlSession(ExecutorType.SIMPLE, false);
      //2.映射sql的标识字符串
      StringBuffer statement = new StringBuffer();
      statement.append("com.tech.ability.mybatis.Mapper.MyUserMapper"); //mapper标签的namespace属性的值
      statement.append(".getUserInfoByIn"); //select标签的id属性值
      //3.定义查询条件
      String strQueryIds = "1,2";
      //4.执行查询返回一个唯一user对象的sql
      List myUser = session.selectList(statement.toString(), strQueryIds);
      mybatisUtils.closeSqlSession(session);
      //5.输出结果
      System.out.println(myUser);
    }
    5.3.测试3
    /**
    • getUserInfoByInnerForeachTest
      */
      private static void getUserInfoByInnerForeachTest() {
      //1.构建sqlSession
      SqlSession session = mybatisUtils.getSqlSession(ExecutorType.SIMPLE, false);
      //3.映射sql的标识字符串
      StringBuffer statement = new StringBuffer();
      statement.append("com.tech.ability.mybatis.Mapper.MyUserMapper"); //mapper标签的namespace属性的值
      statement.append(".getUserInfoByInnerForeach"); //select标签的id属性值
      //3.定义查询条件
      JSONObject jsonObject = new JSONObject();
      List idList = new ArrayList<>();
      idList.add(1);
      idList.add(11);
      jsonObject.put("idList", idList);
      //4.执行查询返回一个唯一user对象的sql
      List myUser = session.selectList(statement.toString(), jsonObject);
      mybatisUtils.closeSqlSession(session);
      //5.输出结果
      System.out.println(myUser);
      }
      5.1.测试4
    /**
    • getUserInfoByInnerForeachRetJsonTest
      */
      private static void getUserInfoByInnerForeachRetJsonTest() {
      //1.构建sqlSession
      SqlSession session = mybatisUtils.getSqlSession(ExecutorType.SIMPLE, false);
      //2.映射sql的标识字符串
      StringBuffer statement = new StringBuffer();
      statement.append("com.tech.ability.mybatis.Mapper.MyUserMapper"); //mapper标签的namespace属性的值
      statement.append(".getUserInfoByInnerForeachRetJson"); //select标签的id属性值
      //3.定义查询条件
      JSONObject jsonObject = new JSONObject();
      List idList = new ArrayList<>();
      idList.add(1);
      idList.add(92);
      jsonObject.put("idList", idList);
      //4.执行查询返回一个唯一user对象的sql
      List myUser = session.selectList(statement.toString(), jsonObject);
      mybatisUtils.closeSqlSession(session);
      //5.输出结果
      System.out.println(myUser);
      }
6.调用
public static void main(String[] args) throws Exception {
//getUserInfoByIDTest();
//getUserInfoByInTest();
//getUserInfoByInnerForeachTest();
//batchUpdateUserInfoListManualTest();
//batchUpdateUserInfoListAutoTest();
//batchInsertUserInfoListByUnionAllTest();
//batchInsertUserInfoListByExecutorBachTest2();
//insertUserXmlTest();
batchInsertUserInfoListByUnionAllTest();
}
}
总结
1.数据库连接时,设置运行多行查询。
2.多条语句,用“;”隔开即可。

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