文章目录
1 概述源码:
https://github.com/lixiang007666/user_curd_mybatis
给个Star哦~~~~
1.1 Maven
Maven项目对象模型(POM),可以通过一小段描述信息来管理项目的构建,报告和文档的项目管理工具软件。
Maven 除了以程序构建能力为特色之外,还提供高级项目管理工具。由于 Maven 的缺省构建规则有较高的可重用性,所以常常用两三行 Maven 构建脚本就可以构建简单的项目。由于 Maven 的面向项目的方法,许多 Apache Jakarta 项目发文时使用 Maven,而且公司项目采用 Maven 的比例在持续增长。
举例:
注意:Maven的项目在idea中,src中的xml等文件是不会编译到claases中的,需要自行配置。
1.2 Mybatis(ORM)
MyBatis 是一款优秀的持久层框架,它支持自定义 SQL、存储过程以及高级映射。MyBatis 免除了几乎所有的 JDBC 代码以及设置参数和获取结果集的工作。MyBatis 可以通过简单的 XML 或注解来配置和映射原始类型、接口和 Java POJO(Plain Old Java Objects,普通老式 Java 对象)为数据库中的记录。
2 Mybatis开发指南4.1 目录结构
4.2 详细步骤
日志文件:
# Global logging configuration
log4j.rootLogger=ERROR, stdout
# MyBatis logging configuration...
log4j.logger.top.lixiang007=DEBUG
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
mybatis总配置文件:
<?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">
<configuration>
<!--1.配置环境 ,默认的环境id为mysql-->
<environments default="mysql">
<!--1.2.配置id为mysql的数据库环境 -->
<environment id="mysql">
<!-- 使用JDBC的事务管理 -->
<transactionManager type="JDBC" />
<!--数据库连接池 -->
<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="lixiang666" />
</dataSource>
</environment>
</environments>
<!--2.配置Mapper的位置 -->
<mappers>
<mapper resource="top/lixiang007/mapper/CustomerMapper.xml" />
</mappers>
</configuration>
mapper文件:
<?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">
<!-- namespace表示命名空间 -->
<mapper namespace="top.lixiang007.mapper.CustomerMapper">
<!--根据客户编号获取客户信息 -->
<select id="findCustomerById" parameterType="Integer"
resultType="top.lixiang007.po.Customer">
select * from t_customer where id = #{id}
</select>
<!--根据客户名模糊查询客户信息列表-->
<select id="findCustomerByName" parameterType="String"
resultType="top.lixiang007.po.Customer">
<!-- select * from t_customer where username like '%${value}%' -->
select * from t_customer where username like concat('%',#{value},'%')
</select>
<!-- 添加客户信息 -->
<insert id="addCustomer" parameterType="top.lixiang007.po.Customer">
insert into t_customer(username,jobs,phone)
values(#{username},#{jobs},#{phone})
</insert>
<!-- 更新客户信息 -->
<update id="updateCustomer" parameterType="top.lixiang007.po.Customer">
update t_customer set
username=#{username},jobs=#{jobs},phone=#{phone}
where id=#{id}
</update>
<!-- 删除客户信息 -->
<delete id="deleteCustomer" parameterType="Integer">
delete from t_customer where id=#{id}
</delete>
</mapper>
实体类:
package top.lixiang007.po;
/**
* 客户持久化类
*/
public class Customer {
private Integer id; // 主键id
private String username; // 客户名称
private String jobs; // 职业
private String phone; // 电话
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 String getJobs() {
return jobs;
}
public void setJobs(String jobs) {
this.jobs = jobs;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
@Override
public String toString() {
return "Customer [id=" + id + ", username=" + username +
", jobs=" + jobs + ", phone=" + phone + "]";
}
}
测试类:
package top.lixiang007.test;
import java.io.InputStream;
import java.util.List;
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 top.lixiang007.po.Customer;
/**
* 入门程序测试类
*/
public class MybatisTest {
/**
* 根据客户编号查询客户信息
*/
@Test
public void findCustomerByIdTest() throws Exception {
// 1、读取配置文件
String resource = "mybatis-config.xml";
InputStream inputStream =
Resources.getResourceAsStream(resource);
// 2、根据配置文件构建SqlSessionFactory
SqlSessionFactory sqlSessionFactory =
new SqlSessionFactoryBuilder().build(inputStream);
// 3、通过SqlSessionFactory创建SqlSession
SqlSession sqlSession = sqlSessionFactory.openSession();
// 4、SqlSession执行映射文件中定义的SQL,并返回映射结果
Customer customer = sqlSession.selectOne("top.lixiang007.mapper"
+ ".CustomerMapper.findCustomerById", 1);
// 打印输出结果
System.out.println(customer.toString());
// 5、关闭SqlSession
sqlSession.close();
}
/**
* 根据用户名称来模糊查询用户信息列表
*/
@Test
public void findCustomerByNameTest() throws Exception{
// 1、读取配置文件
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
// 2、根据配置文件构建SqlSessionFactory
SqlSessionFactory sqlSessionFactory =
new SqlSessionFactoryBuilder().build(inputStream);
// 3、通过SqlSessionFactory创建SqlSession
SqlSession sqlSession = sqlSessionFactory.openSession();
// 4、SqlSession执行映射文件中定义的SQL,并返回映射结果
List<Customer> customers = sqlSession.selectList("top.lixiang007.mapper"
+ ".CustomerMapper.xml.findCustomerByName", "j");
for (Customer customer : customers) {
//打印输出结果集
System.out.println(customer);
}
// 5、关闭SqlSession
sqlSession.close();
}
/**
* 添加客户
*/
@Test
public void addCustomerTest() throws Exception{
// 1、读取配置文件
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
// 2、根据配置文件构建SqlSessionFactory
SqlSessionFactory sqlSessionFactory =
new SqlSessionFactoryBuilder().build(inputStream);
// 3、通过SqlSessionFactory创建SqlSession
SqlSession sqlSession = sqlSessionFactory.openSession();
// 4、SqlSession执行添加操作
// 4.1创建Customer对象,并向对象中添加数据
Customer customer = new Customer();
customer.setUsername("rose");
customer.setJobs("student");
customer.setPhone("13333533092");
// 4.2执行SqlSession的插入方法,返回的是SQL语句影响的行数
int rows = sqlSession.insert("top.lixiang007.mapper"
+ ".CustomerMapper.xml.addCustomer", customer);
// 4.3通过返回结果判断插入操作是否执行成功
if(rows > 0){
System.out.println("您成功插入了"+rows+"条数据!");
}else{
System.out.println("执行插入操作失败!!!");
}
// 4.4提交事务
sqlSession.commit();
// 5、关闭SqlSession
sqlSession.close();
}
/**
* 更新客户
*/
@Test
public void updateCustomerTest() throws Exception{
// 1、读取配置文件
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
// 2、根据配置文件构建SqlSessionFactory
SqlSessionFactory sqlSessionFactory =
new SqlSessionFactoryBuilder().build(inputStream);
// 3、通过SqlSessionFactory创建SqlSession
SqlSession sqlSession = sqlSessionFactory.openSession();
// 4、SqlSession执行更新操作
// 4.1创建Customer对象,对对象中的数据进行模拟更新
Customer customer = new Customer();
customer.setId(4);
customer.setUsername("rose");
customer.setJobs("programmer");
customer.setPhone("13311111111");
// 4.2执行SqlSession的更新方法,返回的是SQL语句影响的行数
int rows = sqlSession.update("top.lixiang007.mapper"
+ ".CustomerMapper.xml.updateCustomer", customer);
// 4.3通过返回结果判断更新操作是否执行成功
if(rows > 0){
System.out.println("您成功修改了"+rows+"条数据!");
}else{
System.out.println("执行修改操作失败!!!");
}
// 4.4提交事务
sqlSession.commit();
// 5、关闭SqlSession
sqlSession.close();
}
/**
* 删除客户
*/
@Test
public void deleteCustomerTest() throws Exception{
// 1、读取配置文件
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
// 2、根据配置文件构建SqlSessionFactory
SqlSessionFactory sqlSessionFactory =
new SqlSessionFactoryBuilder().build(inputStream);
// 3、通过SqlSessionFactory创建SqlSession
SqlSession sqlSession = sqlSessionFactory.openSession();
// 4、SqlSession执行删除操作
// 4.1执行SqlSession的删除方法,返回的是SQL语句影响的行数
int rows = sqlSession.delete("top.lixiang007.mapper"
+ ".CustomerMapper.xml.deleteCustomer", 4);
// 4.2通过返回结果判断删除操作是否执行成功
if(rows > 0){
System.out.println("您成功删除了"+rows+"条数据!");
}else{
System.out.println("执行删除操作失败!!!");
}
// 4.3提交事务
sqlSession.commit();
// 5、关闭SqlSession
sqlSession.close();
}
}
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>top.lixiang007</groupId>
<artifactId>user_curd_mybatis</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>user_curd_mybatis Maven Webapp</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>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>user_curd_mybatis</finalName>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_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-war-plugin</artifactId>
<version>3.2.2</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>
</plugins>
</pluginManagement>
<resources>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
</resources>
</build>
</project>
5 附录