轉：
springboot簡易集成mybatisPlus+多數據源
【我好用的配置文件：
1、pom:【注意druid吧版本要能獲取到jar】
<?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 https://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>2.3.2.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>demo</artifactId> <version>0.0.1-SNAPSHOT</version> <name>demo</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>1.1.22</druid.version> <dynamic.datasource.boot.version>2.5.4</dynamic.datasource.boot.version> </properties> <dependencies> <dependency> <groupId>commons-net</groupId> <artifactId>commons-net</artifactId> <version>3.3</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>2.9.0</version> </dependency> <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、application.yml:【主要注意加粗的紅色兩行要配成和自己本地的mapper及xml一致的】
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 #設置默認的數據源或者數據源組,默認值即為master，如果讀者只是單數據源只需要注釋掉slave相關配置即可，這里為了方便演示master與slave保持相同 datasource: master: url: jdbc:mysql://localhost:3306/account1?serverTimezone=Hongkong&allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false # serverTimezone=Hongkong 需要填上時區 username: root password: 123 driverClassName: com.mysql.cj.jdbc.Driver slave: url: jdbc:mysql://localhost:3306/account2?serverTimezone=Hongkong&allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false # serverTimezone=Hongkong 需要填上時區 username: root password: 123 driverClassName: com.mysql.cj.jdbc.Driver initial-size: 10 # 以下是連接池配置 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 mapper-locations: classpath:/com/example/demo/verifyaccount/mapper/xml/*Mapper.xml #實體掃描，多個package用逗號或者分號分隔 # typeAliasesPackage: com.example.mybatisplus.entity typeAliasesPackage: com.example.demo.verifyaccount.entity check-config-location: true configuration: #是否開啟自動駝峰命名規則（camel case）映射 map-underscore-to-camel-case: true #全局地開啟或關閉配置文件中的所有映射器已經配置的任何緩存 cache-enabled: false call-setters-on-nulls: true #配置JdbcTypeForNull, oracle數據庫必須配置 jdbc-type-for-null: 'null' #MyBatis 自動映射時未知列或未知屬性處理策略 NONE：不做任何處理 (默認值), WARNING：以日志的形式打印相關警告信息, FAILING：當作映射失敗處理，並拋出異常和詳細信息 auto-mapping-unknown-column-behavior: warning
#這個配置會將執行的sql打印出來，在開發或測試的時候可以用
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl global-config: banner: false db-config: #主鍵類型 0:"數據庫ID自增", 1:"未設置主鍵類型",2:"用戶輸入ID (該類型可以通過自己注冊自動填充插件進行填充)", 3:"全局唯一ID (idWorker), 4:全局唯一ID (UUID), 5:字符串全局唯一ID (idWorker 的字符串表示)"; id-type: UUID #字段驗證策略 IGNORED:"忽略判斷", NOT_NULL:"非NULL判斷", NOT_EMPTY:"非空判斷", DEFAULT 默認的,一般只用於注解里(1. 在全局里代表 NOT_NULL,2. 在注解里代表 跟隨全局) field-strategy: NOT_EMPTY #數據庫大寫下划線轉換 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、啟動類：
【要注意這一行：
@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的注解
最好在生產的Mpper類上都加上@Mapper注解
】
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 默認的數據源配置 @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的注解 public class MybatisplusSpringbootApplication { public static void main(String[] args) { SpringApplication.run(MybatisplusSpringbootApplication.class, args); } }
4、分頁攔截器【加上這個就可以用分頁了】
package com.example.demo.config; import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration //@MapperScan("com.example.demo.verifyaccount.*") public class MybatisPlusConfig { @Bean public PaginationInterceptor paginationInterceptor() { return new PaginationInterceptor(); } }
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經過上面4個步驟就可以了，不需要其他config配置類
使用例子：
默認使用主數據源，要想使用其他數據源，可以在生成的service上加@DS("副數據源名稱")
eg:這里的slave對應application.yml中的配置
分頁查詢
eg:
需要現在生成的service中加入分頁查詢代碼：
public interface IDzDetailService extends IService<DzDetail> { public IPage selectPage(IPage iPage, QueryWrapper QueryWrapper); }
然后在業務中調用即可
QueryWrapper<DzDetail> dzDetailQueryWrapper = new QueryWrapper<>();
dzDetailQueryWrapper.eq("status_cd", "1");//未處理
dzDetailQueryWrapper.eq("doc_id", dzDocId);
dzDetailQueryWrapper.orderByAsc("id");
int count = dzDetailService.count(dzDetailQueryWrapper);
//根據文檔id查詢記錄表，分頁查詢，每一萬條處理一次
int size = 10000;
int batchNum = count / size + 1;
IPage<DzDetail> userPage = new Page<>(i*size, size);//參數一是當前頁，參數二是每頁個數
IPage iPage = dzDetailService.selectPage(userPage, dzDetailQueryWrapper);
List<DzDetail> detailList = iPage.getRecords();
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Mybatisplus多數據源
做最會吹牛的程序猿
2019-04-30 14:37:08 
12005 
收藏 13
12005 收藏 13
該項目主要實現mybatisplus、多數據源、lombok、druid的集成
主要參考 https://mp.baomidou.com/guide/quick-start.html
項目地址：https://github.com/Blankwhiter/mybatisplus-springboot release1.0
項目結構：
一、創建表以及測試數據
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, 'test1@baomidou.com'), (2, 'Jack', 20, 'test2@baomidou.com'), (3, 'Tom', 28, 'test3@baomidou.com'), (4, 'Sandy', 21, 'test4@baomidou.com'), (5, 'Billie', 24, 'test5@baomidou.com'); - 1
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二、引入項目依賴，加入配置，修改啟動類，編寫實體類和mapper對象（讀者可以根據自動生成工具生成這塊代碼）
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>