springboot整合mybatisPlus+多資料來源的實現示例
阿新 • • 發佈：2020-12-28
該專案主要實現mybatisplus、多資料來源、lombok、druid的整合
主要參考 https://mp.baomidou.com/guide/quick-start.html
專案地址：https://github.com/Blankwhiter/mybatisplus-springboot release1.0
專案結構：
一、建立表以及測試資料
CREATE TABLE user ( id VARCHAR(32) NOT NULL COMMENT '主鍵ID',name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名',age INT(11) NULL DEFAULT NULL COMMENT '年齡',email VARCHAR(50) NULL DEFAULT NULL COMMENT '郵箱',PRIMARY KEY (id) ); INSERT INTO user (id,name,age,email) VALUES (1,'Jone',18,'[email protected]'),(2,'Jack',20,'[email protected]'),(3,'Tom',28,'[email protected]'),(4,'Sandy',21,'[email protected]'),(5,'Billie',24,'[email protected]');
二、引入專案依賴，加入配置，修改啟動類，編寫實體類和mapper物件（讀者可以根據自動生成工具生成這塊程式碼）
1.引入依賴
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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>mybatisplus-springboot</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>mybatisplus-springboot</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<mysql.version>6.0.6</mysql.version>
<mybatisplus.boot.version>3.1.0</mybatisplus.boot.version>
<druid.version>1.1.10</druid.version>
<dynamic.datasource.boot.version>2.5.4</dynamic.datasource.boot.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>${mybatisplus.boot.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>${druid.version}</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>dynamic-datasource-spring-boot-starter</artifactId>
<version>${dynamic.datasource.boot.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2.編寫配置
application.yml
spring:
autoconfigure:
exclude: com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure # 為了某些版本的springboot @SpringBootApplication(exclude= {DataSourceAutoConfiguration.class}) 無法生效
datasource:
dynamic:
primary: master #設定預設的資料來源或者資料來源組,預設值即為master，如果讀者只是單資料來源只需要註釋掉slave相關配置即可，這裡為了方便演示master與slave保持相同
datasource:
master:
url: jdbc:mysql://localhost:3306/test?serverTimezone=Hongkong&allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false # serverTimezone=Hongkong 需要填上時區
username: root
password: 111111
driverClassName: com.mysql.cj.jdbc.Driver
slave:
url: jdbc:mysql://localhost:3306/test?serverTimezone=Hongkong&allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false # serverTimezone=Hongkong 需要填上時區
username: root
password: 111111
driverClassName: com.mysql.cj.jdbc.Driver
initial-size: 10 # 以下是連線池配置
max-active: 100
min-idle: 10
max-wait: 60000
pool-prepared-statements: true
max-pool-prepared-statement-per-connection-size: 20
time-between-eviction-runs-millis: 60000
min-evictable-idle-time-millis: 300000
#validation-query: SELECT 1
test-while-idle: true
test-on-borrow: false
test-on-return: false
stat-view-servlet:
enabled: true
url-pattern: /druid/*
login-username: druid
login-password: 123456
filter:
stat:
log-slow-sql: true
slow-sql-millis: 1000
merge-sql: false
wall:
config:
multi-statement-allow: true
#mybatis plus
mybatis-plus:
mapper-locations: classpath:mapper/**/*.xml
#實體掃描，多個package用逗號或者分號分隔
typeAliasesPackage: com.example.mybatisplus.entity
check-config-location: true
configuration:
#是否開啟自動駝峰命名規則（camel case）對映
map-underscore-to-camel-case: true
#全域性地開啟或關閉配置檔案中的所有對映器已經配置的任何快取
cache-enabled: false
call-setters-on-nulls: true
#配置JdbcTypeForNull,oracle資料庫必須配置
jdbc-type-for-null: 'null'
#MyBatis 自動對映時未知列或未知屬性處理策略 NONE：不做任何處理 (預設值),WARNING：以日誌的形式列印相關警告資訊,FAILING：當作對映失敗處理，並丟擲異常和詳細資訊
auto-mapping-unknown-column-behavior: warning
global-config:
banner: false
db-config:
#主鍵型別 0:"資料庫ID自增",1:"未設定主鍵型別",2:"使用者輸入ID (該型別可以通過自己註冊自動填充外掛進行填充)",3:"全域性唯一ID (idWorker),4:全域性唯一ID (UUID),5:字串全域性唯一ID (idWorker 的字串表示)";
id-type: UUID
#欄位驗證策略 IGNORED:"忽略判斷",NOT_NULL:"非NULL判斷",NOT_EMPTY:"非空判斷",DEFAULT 預設的,一般只用於註解裡(1. 在全局裡代表 NOT_NULL,2. 在註解裡代表 跟隨全域性)
field-strategy: NOT_EMPTY
#資料庫大寫下劃線轉換
capital-mode: true
#邏輯刪除值
logic-delete-value: 0
#邏輯未刪除值
logic-not-delete-value: 1
server:
port: 7000
3.修改啟動類
MybatisplusSpringbootApplication.java
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class}) //去掉springboot 預設的資料來源配置
@MapperScan("com.example.mybatisplus.mapper") //掃描mapper的包，或者讀者可以在對應的mapper上加上@Mapper的註解
public class MybatisplusSpringbootApplication {
public static void main(String[] args) {
SpringApplication.run(MybatisplusSpringbootApplication.class,args);
}
}
4.編寫實體
4.1 user.java
import lombok.Data;
/**
* user 實體類
*/
@Data
public class User {
private String id;
private String name;
private Integer age;
private String email;
}
注：讀者請自行在開發工具安裝lombok外掛，或者去掉@data註解換成setter getter方法即可
4.2 UserMapper.java
import com.baomidou.dynamic.datasource.annotation.DS;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.mybatisplus.entity.User;
/**
* 使用者mapper
*/
@DS("slave") //這裡是配置資料來源註解，預設是master
public interface UserMapper extends BaseMapper<User> {
}
三、編寫測試用例
import com.example.mybatisplus.entity.User;
import com.example.mybatisplus.mapper.UserMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
/**
* 簡單的測試增刪改查
*/
@RunWith(SpringRunner.class)
@SpringBootTest
public class MybatisplusSpringbootApplicationTests {
@Autowired
private UserMapper userMapper;
@Test
public void addUser() {
User user = new User();
user.setAge(200);
user.setEmail("[email protected]");
user.setName("belongHuang");
userMapper.insert(user);
}
@Test
public void updateUser() {
User user = userMapper.selectById(1);
user.setAge(300);
int i = userMapper.updateById(user);
if (i>0) {
System.out.println("修改成功");
}else {
System.out.println("修改失敗");
}
}
@Test
public void deleteUser() {
int i = userMapper.deleteById(1);
if (i>0) {
System.out.println("刪除成功");
}else {
System.out.println("刪除失敗");
}
}
@Test
public void selectUser() {
List<User> users = userMapper.selectList(null);
users.stream().map(User::getName).forEach(System.out::println);//打印出所用使用者名稱字
}
}
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