SpringCloud(第 044 篇)鏈接Mysql數據庫簡單的集成Mybatis框架採用MapperXml訪問數據庫
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一、大致介紹
1、前面章節講解的是在方法上面添加sql語句操作,雖然說僅僅只是一種簡單的操作,在測試期間可以多試試;
2、但是對於複雜的操作,那種簡單也僅僅只是簡單的自己用用而已,複雜的還是得采用xml配置;
3、因此本章節就試試採用Mybatis框架通過mapperxml進行對數據的操作;
二、實現步驟
2.1 添加 maven 引用包
<?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>
<artifactId>springms-provider-user-mysql-mybatis-mapper</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>com.springms.cloud</groupId>
<artifactId>springms-spring-cloud</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<dependencies>
<!-- 訪問數據庫模塊 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- web模塊 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- MYSQL -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- Mybatis依賴 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.1</version>
</dependency>
<!-- Mysql分頁PageHelper -->
<!--<dependency>-->
<!--<groupId>com.github.pagehelper</groupId>-->
<!--<artifactId>pagehelper</artifactId>-->
<!--</dependency>-->
</dependencies>
</project>
2.2 添加應用配置文件(springms-provider-user-mysql-mybatis-mapper\src\main\resources\application.yml)
server:
port: 8330
spring:
application:
name: springms-provider-user-mysql-mybatis-mapper #全部小寫
#####################################################################################################
# mysql 屬性配置
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://ip:3306/hmilyylimh
username: username
password: password
# jpa:
# hibernate:
# #ddl-auto: create #ddl-auto:設爲create表示每次都重新建表
# ddl-auto: update #ddl-auto:設爲update表示每次都不會重新建表
# show-sql: true
#####################################################################################################
#####################################################################################################
# mybatis mapper xml 配置
mybatis:
# mybatis.type-aliases-package:指定domain類的基包,即指定其在*Mapper.xml文件中可以使用簡名來代替全類名(看後邊的UserMapper.xml介紹)
type-aliases-package:
mapper-locations: classpath:mybatis/mapper/*.xml
config-location: classpath:mybatis/mybatis-config.xml
#####################################################################################################
#####################################################################################################
# 打印日誌
logging:
level:
root: INFO
org.hibernate: INFO
org.hibernate.type.descriptor.sql.BasicBinder: TRACE
org.hibernate.type.descriptor.sql.BasicExtractor: TRACE
com.springms: DEBUG
#####################################################################################################
2.3 添加mybatis配置文件(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/entity/User.java)
<?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>
<settings>
<setting name="callSettersOnNulls" value="true"/>
<setting name="cacheEnabled" value="true"/>
<setting name="lazyLoadingEnabled" value="true"/>
<setting name="aggressiveLazyLoading" value="true"/>
<setting name="multipleResultSetsEnabled" value="true"/>
<setting name="useColumnLabel" value="true"/>
<setting name="useGeneratedKeys" value="false"/>
<setting name="autoMappingBehavior" value="PARTIAL"/>
<setting name="defaultExecutorType" value="SIMPLE"/>
<setting name="mapUnderscoreToCamelCase" value="true"/>
<setting name="localCacheScope" value="SESSION"/>
<setting name="jdbcTypeForNull" value="NULL"/>
</settings>
<typeAliases>
<typeAlias alias="Integer" type="java.lang.Integer" />
<typeAlias alias="Long" type="java.lang.Long" />
<typeAlias alias="HashMap" type="java.util.HashMap" />
<typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap" />
<typeAlias alias="ArrayList" type="java.util.ArrayList" />
<typeAlias alias="LinkedList" type="java.util.LinkedList" />
<typeAlias alias="User" type="com.springms.cloud.entity.User"/>
</typeAliases>
</configuration>
2.4 添加用戶mapperxml映射文件(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/entity/User.java)
<?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.springms.cloud.mapper.IUserMapper">
<resultMap id="result" type="User">
<id column="id" property="id" jdbcType="BIGINT"/>
<result column="username" property="username" jdbcType="VARCHAR"/>
<result column="name" property="name" jdbcType="VARCHAR"/>
<result column="age" property="age" jdbcType="TINYINT"/>
<result column="balance" property="balance" jdbcType="VARCHAR"/>
</resultMap>
<!-- 若不需要自動返回主鍵,將useGeneratedKeys="true" keyProperty="id"去掉即可(當然如果不需要自動返回主鍵,直接用註解即可) -->
<insert id="insertUser" parameterType="User" useGeneratedKeys="false" keyProperty="id" >
<![CDATA[
INSERT INTO user
(
username,
name,
age,
balance
)
VALUES
(
#{username, jdbcType=VARCHAR},
#{name, jdbcType=VARCHAR},
#{age, jdbcType=TINYINT},
#{balance, jdbcType=VARCHAR}
)
]]>
</insert>
<select id="findUserById" resultMap="result" parameterType="Long">
select * from user
where id = #{id,jdbcType=BIGINT}
</select>
<select id="findAllUsers" resultMap="result">
select * from user
</select>
</mapper>
2.5 添加實體用戶類User(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/entity/User.java)
package com.springms.cloud.entity;
public class User {
private Long id;
private String username;
private String name;
private Integer age;
private String balance;
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
public String getUsername() {
return this.username;
}
public void setUsername(String username) {
this.username = username;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return this.age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getBalance() {
return this.balance;
}
public void setBalance(String balance) {
this.balance = balance;
}
}
2.6 添加用戶mapper接口(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/mapper/IUserMapper.java)
package com.springms.cloud.mapper;
import com.springms.cloud.entity.User;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
/**
* 用戶 mybatis 接口文件。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017-10-19
*
*/
public interface IUserMapper {
User findUserById(Long id);
List<User> findAllUsers();
int insertUser(User user);
}
2.7 添加用戶DAO接口類(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/dao/IUserDao.java)
package com.springms.cloud.dao;
import com.springms.cloud.entity.User;
import java.util.List;
/**
* 簡單用戶鏈接Mysql數據庫微服務(通過@Repository註解標註該類爲持久化操作對象)。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017-10-19
*
*/
public interface IUserDao {
User findUserById(Long id);
List<User> findAllUsers();
int insertUser(User user);
}
2.8 添加用戶DAO接口類實現類(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/dao/impl/UserDaoImpl.java)
package com.springms.cloud.dao.impl;
import com.springms.cloud.dao.IUserDao;
import com.springms.cloud.entity.User;
import com.springms.cloud.mapper.IUserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import java.util.List;
/**
* 簡單用戶鏈接Mysql數據庫微服務(通過@Repository註解標註該類爲持久化操作對象)。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017-10-19
*
*/
@Repository
public class UserDaoImpl implements IUserDao {
@Autowired
private IUserMapper iUserMapper;
@Override
public User findUserById(Long id) {
return iUserMapper.findUserById(id);
}
@Override
public List<User> findAllUsers() {
return iUserMapper.findAllUsers();
}
@Override
public int insertUser(User user) {
return iUserMapper.insertUser(user);
}
}
2.9 添加用戶Service接口類(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/service/IUserService.java)
package com.springms.cloud.service;
import com.springms.cloud.entity.User;
import java.util.List;
/**
* 簡單用戶鏈接Mysql數據庫微服務(通過@Service註解標註該類爲持久化操作對象)。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017-10-19
*
*/
public interface IUserService {
User findUserById(Long id);
List<User> findAllUsers();
int insertUser(User user);
}
2.10 添加用戶Service接口實現類(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/service/impl/UserServiceImpl.java)
package com.springms.cloud.service.impl;
import com.springms.cloud.dao.IUserDao;
import com.springms.cloud.entity.User;
import com.springms.cloud.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* 簡單用戶鏈接Mysql數據庫微服務(通過@Service註解標註該類爲持久化操作對象)。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017-10-19
*
*/
@Service
public class UserServiceImpl implements IUserService {
@Autowired
IUserDao iUserDao;
@Override
public User findUserById(Long id) {
return iUserDao.findUserById(id);
}
@Override
public List<User> findAllUsers() {
return iUserDao.findAllUsers();
}
@Override
public int insertUser(User user) {
return iUserDao.insertUser(user);
}
}
2.11 添加用戶Web訪問層Controller(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/controller/ProviderUserMysqlMybatisMapperController.java)
package com.springms.cloud.controller;
import com.springms.cloud.entity.User;
import com.springms.cloud.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
/**
* 用戶微服務Controller。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017-10-19
*
*/
@RestController
public class ProviderUserMysqlMybatisMapperController {
@Autowired
private IUserService iUserService;
@GetMapping("/simple/{id}")
public User findUserById(@PathVariable Long id) {
return this.iUserService.findUserById(id);
}
@GetMapping("/simple/list")
public List<User> findUserList() {
return this.iUserService.findAllUsers();
}
/**
* 添加一個student,使用postMapping接收post請求
*
* http://localhost:8330/simple/addUser?username=user11&age=11&balance=11
*
* @return
*/
@PostMapping("/simple/addUser")
public User addUser(@RequestParam(value = "username", required=false) String username, @RequestParam(value = "age", required=false) Integer age, @RequestParam(value = "balance", required=false) String balance){
User user=new User();
user.setUsername(username);
user.setName(username);
user.setAge(age);
user.setBalance(balance);
int result = iUserService.insertUser(user);
if(result > 0){
return user;
}
user.setId(0L);
user.setName(null);
user.setUsername(null);
user.setBalance(null);
return user;
}
}
2.12 添加微服務啓動類(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/MsProviderUserMysqlMybatisMapperApplication.java)
package com.springms.cloud;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* 鏈接Mysql數據庫簡單的集成Mybatis框架採用MapperXml訪問數據庫。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017-10-19
*
*/
@SpringBootApplication
@MapperScan("com.springms.cloud.mapper.**")
public class MsProviderUserMysqlMybatisMapperApplication {
public static void main(String[] args) {
SpringApplication.run(MsProviderUserMysqlMybatisMapperApplication.class, args);
System.out.println("【【【【【【 鏈接MysqlMybatisMapperXml數據庫微服務 】】】】】】已啓動.");
}
}
三、測試
/****************************************************************************************
注意:Mybatis 需要加上 entity 等註解纔可以使用,不然啓動都會報錯;
@MapperScan("com.springms.cloud.mapper.**") 或者在每個 Mapper 接口文件上添加 @Mapper 也可以;
一、簡單用戶鏈接Mysql數據庫微服務(通過 mybatis 鏈接 mysql 並用 MapperXml 編寫數據訪問):
1、啓動 springms-provider-user-mysql-mybatis-mapper 模塊服務,啓動1個端口;
2、在瀏覽器輸入地址 http://localhost:8330/simple/10 可以看到用戶ID=10的信息成功的被打印出來;
3、使用 IDEA 自帶工具 Test Restful WebService 發送 HTTP POST 請求,並添加 username、age、balance三個參數,然後執行請求,並去 mysql 數據庫查看數據是否存在,正常情況下 mysql 數據庫剛剛插入的數據成功了:
4、使用 REST Client 執行 "/simple/list" 接口,也正常將 mysql 數據庫中所有的用戶信息打印出來了;
****************************************************************************************/
四、下載地址
https://gitee.com/ylimhhmily/SpringCloudTutorial.git
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