文章目錄

• • • 0、創建mybatis 數據庫
    • 1、在mybatis數據庫下創建employee數據表
    • 2、創建Employee對象
    • 3、創建EmployeeMapper接口
    • 4、創建pom.xml
    • 5、創建mybatis-config.xml主配置文件
    • 6、創建EmployeeMapper.xml
    • 7、創建TestMybatis測試類

0、創建mybatis 數據庫

CREATE SCHEMA `mybatis` DEFAULT CHARACTER SET utf8mb4 ;

1、在mybatis數據庫下創建employee數據表

create table employee( id int primary key auto_increment, name varchar(50), gender varchar(1) );

2、創建Employee對象

package com.mi.pojo;public class Employee {private int id;private String name;private String gender;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 String getGender() {return gender;}public void setGender(String gender) {this.gender = gender;}@Overridepublic String toString() {return "Employee{" +"id=" + id +", name='" + name + '\'' +", gender='" + gender + '\'' +'}';} }

3、創建EmployeeMapper接口

package com.mi.dao;import com.mi.pojo.Employee;public interface EmployeeMapper {public Employee getEmployeeById(int id); }

4、創建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.mi</groupId><artifactId>mybatis</artifactId><version>1.0-SNAPSHOT</version><dependencies><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.2</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.6</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>RELEASE</version><scope>test</scope></dependency></dependencies></project>

5、創建mybatis-config.xml主配置文件

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration><environments default="development"><environment id="development"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="com.mysql.jdbc.Driver"/><property name="url" value="jdbc:mysql://localhost:3306/mybatis"/><property name="username" value="root"/><property name="password" value="root"/></dataSource></environment></environments><mappers><mapper resource="mapper/EmployeeMapper.xml"/></mappers> </configuration>

6、創建EmployeeMapper.xml

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <!--指定為接口的全類名--> <mapper namespace="com.mi.dao.EmployeeMapper"><!--id 為接口的方法名--><select id="getEmployeeById" resultType="com.mi.pojo.Employee">select * from employee where id = #{id}</select> </mapper>

7、創建TestMybatis測試類

package com.mi.test;import com.mi.dao.EmployeeMapper; import com.mi.pojo.Employee; 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.io.InputStream;public class TestMybatis {public SqlSessionFactory getSqlSessionFactory() throws IOException {String resource = "mybatis-config.xml";InputStream inputStream = Resources.getResourceAsStream(resource);return new SqlSessionFactoryBuilder().build(inputStream);}@Testpublic void test() throws IOException {//1、獲取SqlSessionFactory對象SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();//2、獲取Sqlsesion對象SqlSession sqlSession = sqlSessionFactory.openSession();try {//3、獲取接口的實現類對象//會為接口自動創建一個代理對象，代理對象去執行增刪改查方法EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);Employee employee = mapper.getEmployeeById(1);System.out.println(employee);}finally {sqlSession.close();}} }

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