spring boot 整合mybatis 的xml版本【包括逆向工程以及分頁外掛】
阿新 • • 發佈：2019-09-24
逆向工程很方便，可以直接根據資料庫和配置檔案生成pojo，mapper介面和相應的對映檔案。
xml版本和全註解版本其實差不多，大部分情況下，都會保留xml檔案方便其他人去擴充套件新的dml方法。
文章旨在記錄ssm專案的搭建過程，除了本文所提到的逆向工程極大的方便了應用的開發效率，還有兩個比較常用的mybatis擴充套件框架。
- common mapper https://github.com/abel533/Mapper/wiki
- mybatisplus https://mp.baomidou.com/guide/quick-start.html
好了，廢話不多說，下面就是完整的搭建過程。
首先是專案的依賴，完整的pom檔案如下：
<?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>com.example</groupId> <artifactId>demo-boot-mybatis-xml</artifactId> <version>1.0-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.3.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.0.1</version> </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> <!-- 分頁外掛 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>1.2.10</version> </dependency> <!-- alibaba的druid資料庫連線池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.16</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <!-- mybatis generator 自動生成程式碼外掛 --> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.5</version> <configuration> <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile> <overwrite>true</overwrite> <verbose>true</verbose> </configuration> </plugin> </plugins> </build> </project>
application.yml檔案配置
server: port: 8080 spring: datasource: name: test type: com.alibaba.druid.pool.DruidDataSource druid: driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://127.0.0.1:3306/db_test?useUnicode=true&characterEncoding=utf-8&allowPublicKeyRetrieval=true&useSSL=false&serverTimezone=GMT%2B8 username: root password: root mybatis: mapper-locations: classpath:mapper/*.xml #注意：一定要對應mapper對映xml檔案的所在路徑 type-aliases-package: com.example.model # 注意：對應實體類的路徑 #pagehelper分頁外掛 pagehelper: helperDialect: mysql reasonable: true supportMethodsArguments: true params: count=countSql
測試的資料庫指令碼
CREATE TABLE t_user(
user_id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
user_name VARCHAR(255) NOT NULL ,
password VARCHAR(255) NOT NULL ,
phone VARCHAR(255) NOT NULL
) ENGINE=INNODB AUTO_INCREMENT=1000 DEFAULT CHARSET=utf8;
配置mybatis-generator自動生成程式碼的相關配置
${basedir}/src/main/resources/generator/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>
<!-- 資料庫驅動:選擇你的本地硬碟上面的資料庫驅動包-->
<classPathEntry location="D:\code\repository\mysql\mysql-connector-java\5.1.47\mysql-connector-java-5.1.47.jar"/>
<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>
<!-- 是否去除自動生成的註釋 true：是 ： false:否 -->
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--資料庫連結URL，使用者名稱、密碼 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1:3306/db_test?characterEncoding=utf-8" userId="root" password="root"/>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- 生成模型的包名和位置-->
<javaModelGenerator targetPackage="com.example.model" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!-- 生成對映檔案的包名和位置-->
<sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!-- 生成DAO的包名和位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.example.mapper" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!-- 要生成的表 tableName是資料庫中的表名或檢視名 domainObjectName是實體類名-->
<table tableName="t_user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"/>
</context>
</generatorConfiguration>執行maven外掛org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate
"C:\Program Files\Java\jdk1.8.0_191\bin\java.exe" -Dmaven.multiModuleProjectDirectory=D:\ideaworkspace_demo\demo-boot-mybatis-xml -Dmaven.home=D:\software\idea\plugins\maven\lib\maven3 -Dclassworlds.conf=D:\software\idea\plugins\maven\lib\maven3\bin\m2.conf -javaagent:D:\software\idea\lib\idea_rt.jar=6721:D:\software\idea\bin -Dfile.encoding=UTF-8 -classpath D:\software\idea\plugins\maven\lib\maven3\boot\plexus-classworlds-2.5.2.jar org.codehaus.classworlds.Launcher -Didea.version=2018.3.5 org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building demo-boot-mybatis-xml 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- mybatis-generator-maven-plugin:1.3.2:generate (default-cli) @ demo-boot-mybatis-xml ---
[INFO] Connecting to the Database
Tue Apr 09 11:16:14 CST 2019 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
[INFO] Introspecting table t_user
log4j:WARN No appenders could be found for logger (org.mybatis.generator.internal.db.DatabaseIntrospector).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
[INFO] Generating Record class for table t_user
[INFO] Generating Mapper Interface for table t_user
[INFO] Generating SQL Map for table t_user
[INFO] Saving file UserMapper.xml
[INFO] Saving file User.java
[INFO] Saving file UserMapper.java
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.180 s
[INFO] Finished at: 2019-04-09T11:16:14+08:00
[INFO] Final Memory: 15M/245M
[INFO] ------------------------------------------------------------------------
Process finished with exit code 0
以上步驟就可以使用generator自動生成model和dao層的程式碼了。
把mybatis的mapper加入到IoC容器中。
package com.example;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
//此註解會把該包下的mapper新增到spring的ioc容器中
@MapperScan("com.example.mapper")
public class MybatisApplication {
public static void main(String[] args) {
SpringApplication.run(MybatisApplication.class, args);
}
}
package com.example.mapper;
import com.example.model.User;
import org.springframework.stereotype.Repository;
import java.util.List;
public interface UserMapper {
int deleteByPrimaryKey(Integer userId);
int insert(User record);
int insertSelective(User record);
User selectByPrimaryKey(Integer userId);
int updateByPrimaryKeySelective(User record);
int updateByPrimaryKey(User record);
List<User> selectAll();
}以上就是專案的基本搭建過程,idea可能會提示mapper無法注入，因為idea並不知道MapperScan註解已經把那些介面新增到容器中了，實際並不影響正常執行。
專案原始碼：https://github.com/lingEric/demo-boot-mybatis-