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MyBatis入门实例（Idea）

2020-02-29 12:04:13  阅读：165  来源： 互联网

标签：return String void Idea private MyBatis import public 入门


开发环境：Idea2018
数据库：mysql 8.0.16
目的：学习Mybatis

  1. 数据库准备
    本次实例使用数据库mysql 8.0.16，用户名root ，密码123456
    创建数据库并建立测试表单：
/*创建数据库*/
CREATE DATABASE tms default character set utf8;

/*创建数据表单*/
CREATE TABLE `t_members` (
    ->   `id` mediumint(8) unsigned NOT NULL AUTO_INCREMENT,
    ->   `nickname` varchar(255) DEFAULT NULL COMMENT '昵称',
    ->   `password` char(32) NOT NULL DEFAULT '' COMMENT '密码',
    ->   `realname` varchar(36) NOT NULL DEFAULT '' COMMENT '真实姓名',
    ->   `gender` enum('MALE','FEMALE','NONE') NOT NULL DEFAULT 'NONE' COMMENT '姓名',
    ->   `rank` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT '会员等级',
    ->   `email` char(50) NOT NULL DEFAULT '' COMMENT '邮箱',
    ->   `mobile` varchar(15) NOT NULL DEFAULT '' COMMENT '手机号',
    ->   `safequestion` varchar(255) NOT NULL DEFAULT '0' COMMENT '安全问题',
    ->   `safeanswer` char(30) NOT NULL DEFAULT '' COMMENT '安全答案',
    ->   `createdTime` datetime DEFAULT NULL COMMENT '创建时间',
    ->   PRIMARY KEY (`id`)
    -> ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 COMMENT='会员表';
    
/*插入测试数据*/
INSERT INTO `t_members` VALUES ('2', 'tom', '123456', 'Tom Hanks', 'MALE', '1', 'e123@t.com', '13588888888', '1+1=?', '3', 'now()');
INSERT INTO `t_members` VALUES ('3', 'andy', '123789', 'Andy Zhou', 'FEMALE', '1', 'e456@t.com', '13699999999', '2+2=?', '5', now());

  1. 项目创建
    File -> New Project, 选择Maven，勾选Create from architype, 选择maven-archetype-quickstart, 点击按钮Next
    选择项目类型
    输入GroupId和ArtifactId, 继续Next
    GroupId和项目名称
    然后继续Next，直到Finish。

  2. 先展示一下项目完成时的整体结构，然后再介绍各种文件的创建过程。新建了的项目缺少的文件夹和Package，自己添加就好。
    整体结构

  3. 新建项目后首先添加必要的依赖到pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.gbs</groupId>
  <artifactId>Members</artifactId>
  <version>1.0-SNAPSHOT</version>

  <name>Members</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.2.8</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.11</version>
    </dependency>

  </dependencies>

  <build>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-jar-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
        <!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
        <plugin>
          <artifactId>maven-site-plugin</artifactId>
          <version>3.7.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-project-info-reports-plugin</artifactId>
          <version>3.0.0</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>
  1. 创建实体类Member
package com.gbs.dao.entity;

import java.io.Serializable;
import java.util.Date;

public class Member implements Serializable {
    private static final long serialVersionUID = 6948864912341044105L;
    private Integer id;
    private String nickname;
    private String password;
    private String realname;
    private String gender;
    private String email;
    private String mobile;
    private Integer rank=0;
    private String safequestion;
    private String safeanswer;
    private Date createdTime;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getRealname() {
        return realname;
    }

    public void setRealname(String realname) {
        this.realname = realname;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getMobile() {
        return mobile;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile;
    }

    public Integer getRank() {
        return rank;
    }

    public void setRank(Integer rank) {
        this.rank = rank;
    }

    public String getSafequestion() {
        return safequestion;
    }

    public void setSafequestion(String safequestion) {
        this.safequestion = safequestion;
    }

    public String getSafeanswer() {
        return safeanswer;
    }

    public void setSafeanswer(String safeanswer) {
        this.safeanswer = safeanswer;
    }

    public Date getCreatedTime() {
        return createdTime;
    }

    public void setCreatedTime(Date createdTime) {
        this.createdTime = createdTime;
    }

    @Override
    public String toString() {
        return "Member{" +
                "id=" + id +
                ", nickname='" + nickname + '\'' +
                ", password='" + password + '\'' +
                ", realname='" + realname + '\'' +
                ", gender='" + gender + '\'' +
                ", email='" + email + '\'' +
                ", mobile='" + mobile + '\'' +
                ", rank=" + rank +
                ", safequestion='" + safequestion + '\'' +
                ", safeanswer='" + safeanswer + '\'' +
                ", createdTime=" + createdTime.toString() +
                '}';
    }
}
  1. Dao层接口实现 MemberDao
package com.gbs.dao;

import com.gbs.dao.entity.Member;
import java.util.List;

public interface MemberDao {
    List<Member> findPageObjects();
}
  1. 创建映射文件MemberMapper.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">

<mapper namespace="com.gbs.dao.MemberDao">

    <select id="findPageObjects" resultType="com.gbs.dao.entity.Member">
        select * from t_members
    </select>
</mapper>
  1. 编写jdbc.properties
jdbc.DriverClassName=com.mysql.cj.jdbc.Driver
jdbc.url =jdbc:mysql://localhost:3306/tms?serverTimezone=UTC&useSSL=false
jdbc.username=root
jdbc.password=123456
  1. 编写mybatis-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <properties resource="jdbc.properties">
    </properties>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.DriverClassName}" />
                <property name="url"
                          value="${jdbc.url}" />
                <property name="username" value="${jdbc.username}" />
                <property name="password" value="${jdbc.password}" />
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper resource="mapper/MemberMapper.xml" />
    </mappers>

</configuration>
  1. 主体代码已经完成，先写测试代码TestMybatis
package com.gbs;

import com.gbs.dao.MemberDao;
import com.gbs.dao.entity.Member;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import java.io.IOException;
import java.util.List;

public class TestMybatis {
    /**查询测试方法*/
    @Test
    public void testFindPageObjects() throws IOException {
        //定义配置文件的路径
        String resource="mybatis-config.xml";
        //通过SqlSessionFactoryBuilder创建SqlSessionFactory
        SqlSessionFactory factory=new SqlSessionFactoryBuilder()
                .build(Resources.getResourceAsStream(resource));
        //通过SqlSessionFactory创建SqlSession
        SqlSession session=factory.openSession();
        //执行dao对象
        MemberDao dao=session.getMapper(MemberDao.class);
        //得到结果集
        List<Member> list=dao.findPageObjects();
        //输出结果集
        System.out.println(list);
        //关闭连接
        session.close();
    }
}
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标签：return,String,void,Idea,private,MyBatis,import,public,入门
来源： https://blog.csdn.net/taylor_gao/article/details/104566221

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