利用mybatis框架构建一个maven项目
本文是基于Windows 10系统环境,利用mybatis框架构建一个maven项目
- Windows 10
- IntelliJ
一、构建过程(简单入门)
(1) 打开IntelliJ,创建一个新项目
(2) 选择“maven”工程,然后点击“next”
(3) 填写公司ID等信息,然后点击“next”
(4) 填写项目名称等信息,然后点击“finish”
(5) 点击“pom.xml”文件,然后填写各种依赖的坐标
<?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.inspur</groupId>
<artifactId>day01_eesy_02mybatis_annotation</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.12</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
</dependency>
</dependencies>
</project>
(6) 创建一个User类,然后生成相应的属性和方法
package com.inspur.domain;
import java.io.Serializable;
import java.util.Date;
public class User implements Serializable{
private Integer id;
private String username;
private Date birthday;
private String sex;
private String address;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", birthday=" + birthday +
", sex='" + sex + '\'' +
", address='" + address + '\'' +
'}';
}
}
(7) 创建一个User类的持久层接口类
package com.inspur.dao;
import com.inspur.domain.User;
import java.util.List;
public interface IUserDao {
List<User> findAll();
}
(8) 创建一个主配置文件SqlMapConfig.xml配置文件
<?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">
<!-- mybatis的主配置文件 -->
<configuration>
<!-- 配置环境 -->
<environments default="mysql">
<!-- 配置mysql环境 -->
<environment id="mysql">
<!-- 配置事务类型 -->
<transactionManager type="JDBC"></transactionManager>
<!-- 配置数据源(连接池) -->
<dataSource type="POOLED">
<!-- 配置连接数据库的基本信息 -->
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://172.30.12.59:3306/eesy_mybatis"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
<!-- 指定映射配置文件的位置,映射配置文件指的是每个dao独立的配置文件 -->
<mappers>
<mapper resource="com/inspur/dao/IUserDao.xml"/>
</mappers>
</configuration>
(9) 创建一个指定类IUserDao的配置文件IUserDao.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.inspur.dao.IUserDao">
<!-- 配置查询所有 -->
<select id="findAll" resultType="com.inspur.domain.User">
select * from user
</select>
</mapper>
(10) 写一个测试类,测试查询结果
package com.inspur.test;
import java.io.InputStream;
import java.util.List;
import com.inspur.dao.IUserDao;
import com.inspur.domain.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class MybatisTest {
public static void main(String[] args) throws Exception{
//1.读取配置文件
InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
//2.创建SqlSessionFactory工厂
SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
SqlSessionFactory factory = builder.build(in);
//3.使用工厂生产SqlSession对象
SqlSession session = factory.openSession();
//4.使用SqlSession对象创建Dao接口的代理对象
IUserDao userDao = session.getMapper(IUserDao.class);
//5.使用代理对象执行方法
List<User> users = userDao.findAll();
for (User user : users){
System.out.println(user);
}
//6.释放资源
session.close();
in.close();
}
}
二、基于注解的构建过程
(1) 打开IntelliJ,创建一个新项目
(2) 选择“maven”工程,然后点击“next”
(3) 填写公司ID等信息,然后点击“next”
(4) 填写项目名称等信息,然后点击“finish”
(5) 点击“pom.xml”文件,然后填写各种依赖的坐标
<?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.inspur</groupId>
<artifactId>day01_eesy_02mybatis_annotation</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.12</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
</dependency>
</dependencies>
</project>
(6) 创建一个User类,然后生成相应的属性和方法
package com.inspur.domain;
import java.io.Serializable;
import java.util.Date;
public class User implements Serializable{
private Integer id;
private String username;
private Date birthday;
private String sex;
private String address;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", birthday=" + birthday +
", sex='" + sex + '\'' +
", address='" + address + '\'' +
'}';
}
}
(7) 创建一个User类的持久层接口类,并添加注解
package com.inspur.dao;
import com.inspur.domain.User;
import java.util.List;
public interface IUserDao {
@Select("select * from user")
List<User> findAll();
}
(8) 创建一个主配置文件SqlMapConfig.xml配置文件
<?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">
<!-- mybatis的主配置文件 -->
<configuration>
<!-- 配置环境 -->
<environments default="mysql">
<!-- 配置mysql环境 -->
<environment id="mysql">
<!-- 配置事务类型 -->
<transactionManager type="JDBC"></transactionManager>
<!-- 配置数据源(连接池) -->
<dataSource type="POOLED">
<!-- 配置连接数据库的基本信息 -->
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://172.30.12.59:3306/eesy_mybatis"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
<!-- 指定映射配置文件的位置,映射配置文件指的是每个dao独立的配置文件
如果是用注解来配置,此处应该使用class属性指定被注解的dao全限定类名-->
<mappers>
<mapper class="com.inspur.dao.IUserDao"/>
</mappers>
</configuration>
(9) 写一个测试类,测试查询结果
package com.inspur.test;
import java.io.InputStream;
import java.util.List;
import com.inspur.dao.IUserDao;
import com.inspur.domain.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class MybatisTest {
public static void main(String[] args) throws Exception{
//1.读取配置文件
InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
//2.创建SqlSessionFactory工厂
SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
SqlSessionFactory factory = builder.build(in);
//3.使用工厂生产SqlSession对象
SqlSession session = factory.openSession();
//4.使用SqlSession对象创建Dao接口的代理对象
IUserDao userDao = session.getMapper(IUserDao.class);
//5.使用代理对象执行方法
List<User> users = userDao.findAll();
for (User user : users){
System.out.println(user);
}
//6.释放资源
session.close();
in.close();
}
}