springboot与mybatis整合第二版
在一个项目中添加其他模块,选择Maven方式。要在pom.xml下添加parent依赖将其变成springBoot工程。
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
项目依赖:
<dependencies>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.40</version>
</dependency>
<!--mybatis-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!--web-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
配置文件
# mybatis
mybatis.type-aliases-package=com.jiuyue.model
mybatis.mapper-locations=classpath:com/jiuyue/mapper/*.xml
# datasource
spring.datasource.url=jdbc:mysql://localhost:3306/springdb?characterEncoding=utf-8&useSSL=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=1111
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
逆向工程自动生成代码实体对象,Mapper接口以及Mapper.xml文件
<?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>
<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>
<!-- 是否去除自动生成的注释 true:是 : false:否 -->
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--数据库链接URL,用户名、密码 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1/springdb" userId="root" password="1111">
</jdbcConnection>
<!-- 默认false,把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer,
为 true时把JDBC DECIMAL和NUMERIC 类型解析为java.math.BigDecimal -->
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- 生成模型的包名和位置-->
<javaModelGenerator targetPackage="com.jiuyue.model" targetProject="src/main/java">
<property name="enableSubPackages" value="false"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!-- 生成映射文件的包名和位置-->
<sqlMapGenerator targetPackage="com.jiuyue.mapper" targetProject="src/main/java">
<property name="enableSubPackages" value="false"/>
</sqlMapGenerator>
<!-- 生成dao(mapper)接口的包名和位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.jiuyue.mapper" targetProject="src/main/java">
<property name="enableSubPackages" value="false"/>
</javaClientGenerator>
<!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
<table tableName="student" domainObjectName="Student" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">
</table>
</context>
</generatorConfiguration>
逆向工程生成代码,只需要配置好生成Model的包,Mapper接口以及Mapper.xml的位置,还有连接数据库的信息,以及数据库的中的table表配置好。
逆向工程自动生成代码需要在pom.xml配置中配置一个插件
<build>
<plugins>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.5</version>
<configuration>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
</dependencies>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
</resources>
</build>
配置好了相关信息,一般我们运行项目的时候,IDEA编译器会找不到*Mapper.xml文件,需要我们在pom.xml中配置好资源信息,在build下配置。
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
</resources>
</build>
一般我们在Serviceimlp实现类中需要注解@Service,需要在Mapper接口中注解@Mapper。
另一种配置就是不用在Mapper接口中注解@Mapper,则可以在Application启动类中注解Mapper接口的包路径。@MapperScan(value = "com.jiuyue.mapper")
/**
* Create bySeptember
* 2019/2/28
* 20:26
*/
@SpringBootApplication
@MapperScan(value = "com.jiuyue.mapper")
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class,args);
}
}