Sqring boot + Mavn + mybatis + sqlite(XML配置的方式)
Sqring boot + Mavn + mybatis + sqlite(XML配置的方式)
网上看了很多Sqring boot + Mavn + mybatis + sqlite的配置，发现了很多坑，尤其是涉及到有增删改查的问题时候,这里整理了一下，希望对大家有帮助，这里用的是Spring boot 2.2.1 release，Intellij Idea的mavn工程，有问题也可以提出，我会补充。
一、 pom.xml配置
1.8
2.1.1
3.27.2.1
org.xerial
sqlite-jdbc
${sqlite.jdbc.version}
org.mybatis.spring.boot
mybatis-spring-boot-starter
${mybatis.spring.boot.version}
properties里面是java sdk的版本，mybatis的版本和sqlite的版本
dependency是相关添加的依赖
二、 application.properties的配置
yml和这个两个格式不一样，要注意
server.port=8090
spring.datasource.driver-class-name=org.sqlite.JDBC
spring.datasource.username=
spring.datasource.password=
spring.datasource.url=jdbc:sqlite:data.db
# Mybatis配置
mybatis.mapper-locations= classpath:mybatis/mapper/*.xml
mybatis.config-location= classpath:mybatis/mybatis-config.xml
mybatis.typeAliasesPackage= com.taiyuan.railway.entity
# sql打印
logging.level.com.taiyuan.railway.mapper= debug
-
spring.datasource.url=jdbc:sqlite:data.db这句是把数据库放到了项目根目录下,上图可看到.
**注意:**resources目录下千万不要方，放了会导致增删改操作成功了，但是数据库没有看到变动
-
mybatis-config.xml是mybatis的全局配置文件
-
mybatis.mapper-locations= classpath:mybatis/mapper/*.xml指明了要配置的SQL映射文件的目录如上图所示。
-
mybatis.typeAliasesPackage= com.xx.xx.entity为实体所在的包路径(具体根据自己创建的项目包路径填写)
三、mybatis-config.xml配置
**注意：**datasource.driver等属性与第二步中的application.properties中sql的配置属性对应的
四、正式开始创建sqlite、 entity、mapper、service、controller
1、Sqlite创建
自己创建一个sqlite数据库(新键文本文档，将后缀名改为db即可,我这里创建的为data.db)
PRAGMA foreign_keys = false;
-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS "user";
CREATE TABLE "user" (
"user_id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
"user_name" varchar(15) NOT NULL,
"password" varchar(30) NOT NULL,
"age" int(2) DEFAULT NULL
);
-- ----------------------------
-- Auto increment value for user
-- ----------------------------
UPDATE "sqlite_sequence" SET seq = 14 WHERE name = 'user';
PRAGMA foreign_keys = true;
2、entity
在自己工程包路径下的entity创建一个User实体：
package com.taiyuan.railway.entity;
public class User {
private Integer userId;
private String userName;
private String password;
private Integer age;
public User() {
}
public User(Integer userId, String userName, String password, Integer age) {
this.userId = userId;
this.userName = userName;
this.password = password;
this.age = age;
}
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
3、UserMapper
UserMapper的接口定义
package com.taiyuan.railway.mapper;
import com.taiyuan.railway.entity.User;
import org.apache.ibatis.annotations.*;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
import java.util.List;
@Mapper
@Component
public interface UserMapper {
/**
* 查询所有
*/
List<User> getAllUsers();
/**
* 根据主键查询
*/
User getUserById(@Param("id") Integer id);
/**
* 添加
*/
int addUser(User user);
/**
* 删除
*/
int deleteUser(@Param("id") Integer id);
/**
* 修改
*/
int updateUser(User user);
}
注意：
@Mapper表示此接口会进行Mapper映射
@Component表示框架可以注册的组件
UserMapper的xml 映射
<mapper namespace="com.taiyuan.railway.mapper.UserMapper" >
<resultMap id="BaseResultMap" type="com.taiyuan.railway.entity.User" >
<id column="user_id" property="userId" jdbcType="INTEGER" />
<result column="user_name" property="userName" jdbcType="VARCHAR" />
<result column="password" property="password" jdbcType="VARCHAR" />
<result column="age" property="age" jdbcType="INTEGER" />
resultMap>
<select id="getAllUsers" resultMap="BaseResultMap" >
select * from user
select>
<select id="getUserById" parameterType="java.lang.Integer" resultMap="BaseResultMap" >
select * from user where user_id = #{id}
select>
<insert id="addUser" parameterType="com.taiyuan.railway.entity.User" >
insert into user values(#{userId},#{userName},#{password},#{age})
insert>
<delete id="deleteUser" parameterType="java.lang.Integer" >
delete from user where user_id = #{id}
delete>
<update id="updateUser" parameterType="com.taiyuan.railway.entity.User" >
update user set user_name=#{userName},password=#{password},age=#{age} where user_id = #{userId}
update>
mapper>
注意：
- namespace中的包路径要与具体映射的接口对应
- resultMap 中type属性要对应具体的entity，其下的子节点是entity属性的描述
- select insert delete update中的id要与映射的接口函数名对应
4、service
package com.taiyuan.railway.service;
import com.taiyuan.railway.entity.User;
import com.taiyuan.railway.mapper.UserMapper;
import org.apache.ibatis.annotations.Param;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.io.PushbackReader;
import java.util.List;
@Service
public class UserService {
@Autowired
private UserMapper userMapper;
public List<User> getAllUsers(){
return userMapper.getAllUsers();
}
public User getUserById(@Param("id") Integer id){
return userMapper.getUserById(id);
}
// @Transactional(rollbackFor = Exception.class)
@Transactional(rollbackFor = {RuntimeException.class,Exception.class})
public int addUser(User user) throws Exception
{
return userMapper.addUser(user);
}
public int deleteUser(@Param("id") Integer id)
{
return userMapper.deleteUser(id);
}
public int updateUser(User user)
{
return userMapper.updateUser(user);
}
}
注意:
@Transactional为要进行事务的函数标注(这点在这个demo中没有仔细研究，增删改，不加这个标注也能成功)框架事务默认是关闭的，要在程序入口开启@EnableTransactionManagement
我这代码示例如下:
package com.taiyuan.railway;
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.transaction.annotation.EnableTransactionManagement;
@SpringBootApplication
@EnableTransactionManagement
public class RailwayApplication {
public static void main(String[] args) {
SpringApplication.run(RailwayApplication.class, args);
}
}
5、controller
package com.taiyuan.railway.controller;
import com.taiyuan.railway.entity.User;
import com.taiyuan.railway.service.UserService;
import io.swagger.annotations.Api;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping("User")
@Api(tags = "SqlLiteMybatisTest")
public class UserController {
@Autowired
private UserService userService;
@GetMapping("/getAllUsers")
public List<User> getAllUsers() {
return userService.getAllUsers();
}
@GetMapping("/getUser/{id}")
public User getUserById(Integer id) {
return userService.getUserById(id);
}
/**
*
* 请使用接口测试工具进行测试
*/
@PostMapping("/addUser")
@ResponseStatus(HttpStatus.CREATED)
public Boolean addUser(@RequestBody User user) {
int temp = 0;
try{
temp = userService.addUser(user);
}catch (Exception e)
{
e.printStackTrace();
}
return temp > 0;
}
@DeleteMapping("/deleteUser")
public String deleteUser(@RequestParam Integer id){
int i = userService.deleteUser(id);
if (i>0){
return "删除成功";
}else {
return "删除失败";
}
}
@PutMapping("/updateUser")
public String updateUser(){
User user = userService.getUserById(1);
user.setUserName("zxp");
user.setPassword("999");
user.setAge(24);
int i = userService.updateUser(user);
if (i>0){
return "修改成功";
}else {
return "修改失败";
}
}
}
select和增加的log结果
2019-11-25 16:49:23.796 INFO 8036 --- [nio-8090-exec-1] com.zaxxer.hikari.HikariDataSource : HikariPool-2 - Starting...
2019-11-25 16:49:23.797 INFO 8036 --- [nio-8090-exec-1] com.zaxxer.hikari.HikariDataSource : HikariPool-2 - Start completed.
2019-11-25 16:49:23.797 DEBUG 8036 --- [nio-8090-exec-1] c.t.r.mapper.UserMapper.getAllUsers : ==> Preparing: select * from user
2019-11-25 16:49:23.797 DEBUG 8036 --- [nio-8090-exec-1] c.t.r.mapper.UserMapper.getAllUsers : ==> Parameters:
2019-11-25 16:49:23.798 DEBUG 8036 --- [nio-8090-exec-1] c.t.r.mapper.UserMapper.getAllUsers : <== Total: 6
2019-11-25 18:03:33.114 DEBUG 8036 --- [nio-8090-exec-1] c.t.railway.mapper.UserMapper.addUser : ==> Preparing: insert into user values(?,?,?,?)
2019-11-25 18:03:33.115 DEBUG 8036 --- [nio-8090-exec-1] c.t.railway.mapper.UserMapper.addUser : ==> Parameters: 41(Integer), string(String), string(String), 0(Integer)
2019-11-25 18:03:33.115 DEBUG 8036 --- [nio-8090-exec-1] c.t.railway.mapper.UserMapper.addUser : <== Updates: 1