SpringBoot mybatis配置

Posted 2021-02-15 小传风

首先pom.xml

 <!-- mybatis 配置 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

application.properties

#mysql配置
spring.datasource.chen.jdbc-url=jdbc:mysql://localhost:3306/chen?serverTimezone=Asia/Shanghai
spring.datasource.chen.username=root
spring.datasource.chen.password=root
#mysql-connector-java 6中的
spring.datasource.chen.driver-class-name=com.mysql.cj.jdbc.Driver

配置DataSource

package com.example.demo.configuration;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

@Configuration
public class DataSourceConfig {

    @Bean(name = "dataSource")
    @ConfigurationProperties(prefix = "spring.datasource.chen")
    public DataSource chenDataSource() {
        return DataSourceBuilder.create().build();
    }
}

新增DTO实体类

package com.example.demo.biz.dto;

public class User {

    private int id;

    private String userName;

    private String passWord;

    private String gender;

    private String email;

    private String mobile;

    private String identity;

    private String nationality;

    private String description;

    private String address;

    public int getId() {
        return id;
    }

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

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getUserName() {
        return userName;
    }

    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }

    public String getGender() {
        return gender;
    }

    public String getEmail() {
        return email;
    }

    public String getMobile() {
        return mobile;
    }

    public String getIdentity() {
        return identity;
    }

    public String getNationality() {
        return nationality;
    }

    public String getDescription() {
        return description;
    }

    public String getAddress() {
        return address;
    }

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

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

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

    public void setIdentity(String identity) {
        this.identity = identity;
    }

    public void setNationality(String nationality) {
        this.nationality = nationality;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", userName=\'" + userName + \'\\\'\' +
                ", passWord=\'" + passWord + \'\\\'\' +
                ", gender=\'" + gender + \'\\\'\' +
                ", email=\'" + email + \'\\\'\' +
                ", mobile=\'" + mobile + \'\\\'\' +
                ", identity=\'" + identity + \'\\\'\' +
                ", nationality=\'" + nationality + \'\\\'\' +
                ", description=\'" + description + \'\\\'\' +
                ", address=\'" + address + \'\\\'\' +
                \'}\';
    }
}

View Code

新增DAO层：

package com.example.demo.biz.dao;

import com.example.demo.biz.dto.User;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * xml  形式配置
 */
@Repository
public interface UserMapper {
    List<User> getAll();
    User getOne(int id);
    void insertUser(User user);
    void deleteUserById(int id);

    /**
     * 动态sql
     * @param sql
     * @return
     */
    List<User> queyrUserList(String sql);

    /**
     * 动态sql
     * @param sql
     * @return
     */
    List<User> queyrUserList2(@Param("querySql") String sql);
}

添加xml方式配置

#mybatis xml配置
mybatis.config-location=classpath:mybatis/mybatis-config.xml
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

添加sqlmap.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>
    <settings>
        <!--当返回行的所有列都是空时，MyBatis默认返回null  注意pom.xml ：mybatis 1.3.0-->
        <setting name="returnInstanceForEmptyRow" value="true"/>
        <!-- 显示查询语句 -->
        <setting name="logImpl" value="STDOUT_LOGGING" />
        <!--是否使用缓存-->
        <setting name="cacheEnabled" value="true" />
        <!-- 懒加载 -->
        <setting name="lazyLoadingEnabled" value="true" />
        <!--是否允许单条sql 返回多个数据集  (取决于驱动的兼容性) default:true-->
        <setting name="multipleResultSetsEnabled" value="true"/>
        <!--是否可以使用列的别名 (取决于驱动的兼容性) default:true-->
        <setting name="useColumnLabel" value="true"/>
    </settings>

    <!--
      3.typeAliases:起别名的标签
          typeAlias:为某个java类型起别名
              type:指定要起别名的全类名，默认别名就是类小写，(但是其实他是不区分大小写的，也就是说你全部大写也没问题)
              alias:新的别名
          package:为某个包下的类批量起别名(这个会存在的一个问题就是可能会重复，重复的情况下还可以用@Alias来解决)
              name:指定包名(这个就相当于是为这个包下的所有的类都创建了一个默认的别名)
      当然还有一个起别名的方式就是在实体上使用@Alias来起别名
      注：起别名看自己的情况，推荐还是在mapper文件中使用全类名
  -->
    <typeAliases>
        <typeAlias alias="Integer" type="java.lang.Integer" />
        <typeAlias alias="Long" type="java.lang.Long" />
        <typeAlias alias="HashMap" type="java.util.HashMap" />
        <typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap" />
        <typeAlias alias="ArrayList" type="java.util.ArrayList" />
        <typeAlias alias="LinkedList" type="java.util.LinkedList" />
    </typeAliases>
</configuration>

<?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.example.demo.biz.dao.UserMapper">

    <resultMap id="BaseResultMap" type="com.example.demo.biz.dto.User" >
        <id column="id" property="id" jdbcType="INTEGER" />
        <result column="username" property="userName" jdbcType="VARCHAR" />
        <result column="pwd" property="passWord" jdbcType="VARCHAR" />
        <result column="gender" property="gender" jdbcType="VARCHAR"/>
        <result column="email" property="email" jdbcType="VARCHAR" />
        <result column="mobile" property="mobile" jdbcType="VARCHAR" />
        <result column="identity" property="identity" jdbcType="VARCHAR" />
        <result column="nationality" property="nationality" jdbcType="VARCHAR" />
        <result column="description" property="description" jdbcType="VARCHAR" />
        <result column="address" property="address" jdbcType="VARCHAR" />
    </resultMap>

    <sql id="Base_Column_List">
        id, username, pwd, gender, email,mobile,identity,address
    </sql>

    <select id="getAll" resultMap="BaseResultMap">
        SELECT
        <include refid="Base_Column_List"/>
        FROM c_tbl_users
    </select>

    <select id="getOne" parameterType="java.lang.Long" resultMap="BaseResultMap" >
        SELECT
        <include refid="Base_Column_List"/>
        FROM c_tbl_users
        WHERE id = #{id}
    </select>

    <insert id="insertUser" parameterType="com.example.demo.biz.dto.User">
       insert into c_tbl_users (username,pwd,gender,email,mobile,identity,address)
       values(#{userName},#{passWord},#{gender},#{email},#{mobile},#{identity},#{address})
    </insert>

    <delete id="deleteUserById" parameterType="Integer">
        delete t from c_tbl_users t where t.id=#{id}
    </delete>

    <select id="queyrUserList" parameterType="java.lang.String" resultMap="BaseResultMap">
        ${value1}
    </select>

    <select id="queyrUserList2" parameterType="java.lang.String" resultMap="BaseResultMap">
        ${querySql}
    </select>

</mapper>

 注意：dao包扫描

@SpringBootApplication
//@EnableScheduling
@MapperScan("com.example.demo.biz.dao")
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

测试：

package com.example.demo.biz;

import com.example.demo.biz.dao.UserMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import javax.sql.DataSource;
@RunWith(SpringRunner.class)
@SpringBootTest
public class UserTest {

    @Autowired
    protected UserMapper userMapper;

    @Autowired
    DataSource dataSource;

    @Test
    public void test1(){
        System.out.println("dataSource = "+dataSource);
    }

    @Test
    public void test2(){
        System.out.println(userMapper.getAll());
    }
}

运行test2: