大概介绍下流程：
- 借助idea实现mybatis逆向工程
- 用xml配置实现整合
- 用cmd命令行实现mybatis逆向工程
- 用mapping.xml配置实现数据交互
- 用注解的方式实现数据交互
首先我的开发环境：
jdk1.8+maven3+IDEA
1. mybatis逆向攻城
逆向工程方式很多，我目前接触到的就两种，一种是借助于ide开发工具，一种是在cmd中执行命令。（其实二者原理都一样，都是执行maven的generator命令，具体请看下文）。
1. 完善pom文件
<?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>springboot-mybatis</groupId> <artifactId>springboot-mybatis</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot-mybatis</name> <description>Demo project for Spring Boot</description> <parent> <groupId>springboot-integration</groupId> <artifactId>springboot-integration</artifactId> <version>1.0-SNAPSHOT</version> </parent> <!-- Add typical dependencies for a web application --> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.0</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.35</version> </dependency> <!-- alibaba的druid数据库连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.11</version> </dependency> <!-- alibaba的druid数据库连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.0</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <scope>test</scope> </dependency> <!-- 分页插件 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>5.0.4</version> </dependency> </dependencies> <!-- Package as an executable jar --> <build> <finalName>springboot-mybatis</finalName> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-surefire-plugin</artifactId> <configuration> <testFailureIgnore>true</testFailureIgnore> </configuration> </plugin> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.2</version> <configuration> <verbose>true</verbose> <overwrite>true</overwrite> </configuration> </plugin> </plugins> </build> </project>
2. 逆向所需配置文件generatorConfig.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"> <generatorConfiguration> <!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包--> <classPathEntry location="E:libmysql_drivermysql-connector-java-5.1.26-bin.jar"/> <context id="DB2Tables" targetRuntime="MyBatis3"> <commentGenerator> <property name="suppressDate" value="true"/> <!-- 是否去除自动生成的注释 true：是 ： false:否 --> <property name="suppressAllComments" value="true"/> </commentGenerator> <!--数据库链接URL，用户名、密码 --> <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1/user" userId="root" password="root"></jdbcConnection> <javaTypeResolver> <property name="forceBigDecimals" value="false"/> </javaTypeResolver> <!-- 生成模型的包名和位置--> <javaModelGenerator targetPackage="com.fantj.sbmybatis.model" targetProject="src/main/java"> <property name="enableSubPackages" value="true"/> <property name="trimStrings" value="true"/> </javaModelGenerator> <!-- 生成映射文件的包名和位置--> <sqlMapGenerator targetPackage="mapping" targetProject="src/main/resources"> <property name="enableSubPackages" value="true"/> </sqlMapGenerator> <!-- 生成DAO的包名和位置--> <javaClientGenerator type="XMLMAPPER" targetPackage="com.fantj.sbmybatis.mapper" targetProject="src/main/java"> <property name="enableSubPackages" value="true"/> </javaClientGenerator> <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名--> <table tableName="user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table> </context> </generatorConfiguration>
3. 利用IDE创建逆向工程启动类
4. add一个Maven configuration
5. 我的数据库和表结构
6. application配置文件
server:port: 8080
spring:
datasource:
name: test
url: jdbc:mysql://127.0.0.1:3306/user
username: root
password: root
# druid 连接池
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
filters: stat
maxActive: 20
initialSize: 1
maxWait: 60000
minIdle: 1
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: select 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
maxOpenPreparedStatements: 20
mybatis:
mapper-locations: classpath:mapping/*.xml
type-aliases-package: com.fant.model
#pagehelper分页插件
pagehelper:
helperDialect: mysql
reasonable: true
supportMethodsArguments: true
params: count=countSql
运行generator工程 自动生成代码
生成的文件
User.java
package com.fantj.model;
import java.util.Date;
public class User {
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 == null ? null : username.trim();
}
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 == null ? null : sex.trim();
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address == null ? null : address.trim();
}
}
UserMapper .java
package com.fantj.mapper; import com.fantj.model.User; import java.util.List; public interface UserMapper { int deleteByPrimaryKey(Integer id); int insert(User record); int insertSelective(User record); User selectByPrimaryKey(Integer id); int updateByPrimaryKeySelective(User record); int updateByPrimaryKey(User record); List<User> selectAll(); }
UserMapper.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.fantj.mapper.UserMapper"> <resultMap id="BaseResultMap" type="com.fantj.model.User"> <id column="id" property="id" jdbcType="INTEGER"/> <result column="username" property="username" jdbcType="VARCHAR"/> <result column="birthday" property="birthday" jdbcType="DATE"/> <result column="sex" property="sex" jdbcType="CHAR"/> <result column="address" property="address" jdbcType="VARCHAR"/> </resultMap> <sql id="Base_Column_List"> id, username, birthday, sex, address </sql> <select id="selectAll" resultMap="BaseResultMap">select <include refid="Base_Column_List"/> from user </select> <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer">select <include refid="Base_Column_List"/> from user where id = #{id,jdbcType=INTEGER} </select> <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer"> delete from user where id = #{id,jdbcType=INTEGER} </delete> <insert id="insert" parameterType="com.fantj.model.User"> insert into user (id, username, birthday, sex, address) values (#{id,jdbcType=INTEGER}, #{username,jdbcType=VARCHAR}, #{birthday,jdbcType=DATE}, #{sex,jdbcType=CHAR}, #{address,jdbcType=VARCHAR}) </insert> <insert id="insertSelective" parameterType="com.fantj.model.User">insert into user <trim prefix="(" suffix=")" suffixOverrides=","> <if test="id != null">id,</if> <if test="username != null">username,</if> <if test="birthday != null">birthday,</if> <if test="sex != null">sex,</if> <if test="address != null">address,</if> </trim> <trim prefix="values (" suffix=")" suffixOverrides=","> <if test="id != null">#{id,jdbcType=INTEGER},</if> <if test="username != null">#{username,jdbcType=VARCHAR},</if> <if test="birthday != null">#{birthday,jdbcType=DATE},</if> <if test="sex != null">#{sex,jdbcType=CHAR},</if> <if test="address != null">#{address,jdbcType=VARCHAR},</if> </trim> </insert> <update id="updateByPrimaryKeySelective" parameterType="com.fantj.model.User">update user <set> <if test="username != null">username = #{username,jdbcType=VARCHAR},</if> <if test="birthday != null">birthday = #{birthday,jdbcType=DATE},</if> <if test="sex != null">sex = #{sex,jdbcType=CHAR},</if> <if test="address != null">address = #{address,jdbcType=VARCHAR},</if> </set> where id = #{id,jdbcType=INTEGER} </update> <update id="updateByPrimaryKey" parameterType="com.fantj.model.User"> update user set username = #{username,jdbcType=VARCHAR}, birthday = #{birthday,jdbcType=DATE}, sex = #{sex,jdbcType=CHAR}, address = #{address,jdbcType=VARCHAR} where id = #{id,jdbcType=INTEGER} </update> </mapper>
修改启动类
逆向生成代码后，我们还需要在启动类上添加一个@MapperScan("com.fantj.mapper")注解，告诉我们的Mapper需要扫描的包，这样就不用每个Mapper上都添加@Mapper注解了
package com.fantj;
import com.fantj.util.Params;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@SpringBootApplication
@MapperScan("com.fantj.mapper")
public class MybatisApplication {
public static void main(String[] args) {
SpringApplication.run(MybatisApplication.class, args);
}
}
完善controller和service
UserController.java
package com.fantj.controller; import com.fantj.model.User; import com.fantj.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; import javax.jws.soap.SOAPBinding; import java.util.Date; import java.util.List; @RestController @RequestMapping("/user") public class UserController { @Autowired private UserService userService; @RequestMapping(method = RequestMethod.GET, value = "/delete/{id}") public void delete(@PathVariable("id") int id) { userService.delete(id); } @RequestMapping(method = RequestMethod.POST, value = "/insert") public void insert(User user) { userService.insert(user); } @RequestMapping(method = RequestMethod.POST, value = "/update/{id}") public void update(@RequestParam User user) { userService.update(user); } @RequestMapping(method = RequestMethod.GET, value = "/{id}/select") public User select(@PathVariable("id") int id) { return userService.selectById(id); } @RequestMapping(method = RequestMethod.GET, value = "/selectAll/{pageNum}/{pageSize}") public List<User> selectAll(@PathVariable("pageNum") int pageNum, @PathVariable("pageSize") int pageSize) { return userService.selectAll(pageNum, pageSize); } }
UserService.java
package com.fantj.service; import com.fantj.model.User; import java.util.List; public interface UserService { /** * 删除 */ public void delete(int id); /** * 增加 */ public void insert(User user); /** * 更新 */ public int update(User user); /** * 查询单个 */ public User selectById(int id); /** * 查询全部列表 */ public List<User> selectAll(int pageNum, int pageSize); }
UserServiceImpl .java
package com.fantj.service.impl; import com.fantj.mapper.UserMapper; import com.fantj.model.User; import com.fantj.service.UserService; import com.github.pagehelper.PageHelper; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; @Service public class UserServiceImpl implements UserService { @Autowired private UserMapper userMapper; /** * 删除 * * @param id */ @Override public void delete(int id) { userMapper.deleteByPrimaryKey(id); } /** * 增加 * * @param user */ @Override public void insert(User user) { userMapper.insert(user); } /** * 更新 * * @param user */ @Override public int update(User user) { return userMapper.updateByPrimaryKey(user); } /** * 查询单个 * * @param id */ @Override public User selectById(int id) { return userMapper.selectByPrimaryKey(id); } /** * 查询全部列表,并做分页 * * @param pageNum 开始页数 * @param pageSize 每页显示的数据条数 */ @Override public List<User> selectAll(int pageNum, int pageSize) { //将参数传给这个方法就可以实现物理分页了，非常简单。 PageHelper.startPage(pageNum,pageSize); return userMapper.selectAll(); } }