MyBatis配置文件

整合Spring

application.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd">

  <context:component-scan base-package="com.hemou.service"/>

  <context:property-placeholder location="classpath:db.properties"/>
  <!-- 配置数据源 -->
  <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="${jdbc.driver}"/>
    <property name="jdbcUrl" value="${jdbc.url}"/>
    <property name="user" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>
  </bean>

  <!--sqlSessionFactory-->
  <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="typeAliasesPackage" value="com.hemou.domain"/>
    <property name="dataSource" ref="dataSource"/>
    <!--<property name="mapperLocations" value="classpath:mapper/*Mapper.xml"/>-->
  </bean>

  <!--Mybatis的mapper扫描-->
  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.hemou.mapper"/>
    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBean"/>
  </bean>

  <!-- 启动spring的事务管理   配置都是固定的在哪个项目都几乎一样 -->
  <aop:config>
    <aop:pointcut id="serviceMethod" expression="execution(* com.hemou..service.impl.*.*(..))" />
    <aop:advisor advice-ref="adviceTran" pointcut-ref="serviceMethod" />
  </aop:config>

  <!-- 定义事务管理器 -->
  <bean id="trans" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"/>
  </bean>

  <!--配置advice-->
  <tx:advice id="adviceTran" transaction-manager="trans">
    <tx:attributes>
      <tx:method name="select*" propagation="SUPPORTS" isolation="DEFAULT"/>
      <tx:method name="update*" propagation="REQUIRED"/>
      <tx:method name="del*" propagation="REQUIRED"/>
      <tx:method name="insert*" propagation="REQUIRED"/>
      <tx:method name="*" propagation="SUPPORTS" read-only="true"/>
    </tx:attributes>
  </tx:advice>

</beans>

pom.xml

<dependencies>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.22</version>
    </dependency>
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus</artifactId>
        <version>3.3.2</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.30</version>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.2.3</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.3.25.RELEASE</version>
        <exclusions>
            <exclusion>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>4.3.25.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>com.mchange</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.5.5</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>jcl-over-slf4j</artifactId>
        <version>1.7.30</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aspects</artifactId>
        <version>4.3.25.RELEASE</version>
    </dependency>
</dependencies>

注意：spring依赖除了核心容器外，还需要spring-jdbc和spring-aspects

logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <!-- 日志输出格式 -->
  <property name="log.pattern" value="%d{HH:mm:ss.SSS} [%thread] %-5level %logger{20} - [%method,%line] - %msg%n"/>

  <!-- 控制台输出 -->
  <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>${log.pattern}</pattern>
    </encoder>
  </appender>

  <!--系统操作日志-->
  <root level="info">
    <appender-ref ref="console"/>
  </root>
</configuration>

整合Mybatis-Plus

对 application.xml 做出以下调整

配置 MapperScan

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.baomidou.mybatisplus.samples.quickstart.mapper"/>
</bean>

调整 SqlSessionFactory 为 MyBatis-Plus 的 SqlSessionFactory

<bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
</bean>

逆向工程

需要额外的Mybatis Generator jar包（mybatis-generator-core-xxx.jar）

Generator类的编写

public class GeneratorSqlmap {

    public void generator() throws Exception {

        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        //指定 逆向工程配置文件
        File configFile = new File(this.getClass().getResource("generatorConfig.xml").toURI());
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,
                callback, warnings);
        myBatisGenerator.generate(null);

    }

    public static void main(String[] args) throws Exception {
        try {
            GeneratorSqlmap generatorSqlmap = new GeneratorSqlmap();
            generatorSqlmap.generator();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

generatorConfig.xml

Generator配置文件generatorConfig.xml相关标签作用

<?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="testTables" targetRuntime="MyBatis3">

        <commentGenerator>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>


        <!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/*" userId="root"
                        password="root">
        </jdbcConnection>

        <!--连接oracle数据库-->
        <!--<jdbcConnection driverClass="oracle.jdbc.OracleDriver"-->
        <!--    connectionURL="jdbc:oracle:thin:@127.0.0.1:1521:yycg" -->
        <!--    userId="yycg"-->
        <!--    password="yycg">-->
        <!--</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>


        <!-- targetProject:生成PO类的位置 -->
        <javaModelGenerator targetPackage="cn.*" targetProject="src/main/java">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false"/>
            <!-- 从数据库返回的值被清理前后的空格 -->
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>


        <!-- targetProject:mapper映射文件生成的位置 -->
        <sqlMapGenerator targetPackage="cn.*" targetProject="src/main/java">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>


        <!-- targetPackage：mapper接口生成的位置 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="cn.*" targetProject="src/main/java">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false"/>
        </javaClientGenerator>


        <!-- 指定数据库表 -->
        <!--
        domainObjectName：生成对象的基本名称。如果没有指定，MBG会自动根据表名来生成名称。
        enableCountByExample:Count语句中加入where条件查询，默认为true开启
        enableUpdateByExample:Update语句中加入where条件查询，默认为true开启
        enableDeleteByExample:Delete语句中加入where条件查询，默认为true开启
        enableSelectByExample:Select多条语句中加入where条件查询，默认为true开启
        selectByExampleQueryId:Select单个对象语句中加入where条件查询，默认为true开启
        -->
        <table tableName="category" domainObjectName="Category" 　　　　　　　　enableCountByExample="false" 　　　　　　　　enableUpdateByExample="false" 　　　　　　　　enableDeleteByExample="false" 　　　　　　　　enableSelectByExample="true" selectByExampleQueryId="false">

            <!--使用实际的列名-->
            <property name="useActualColumnNames" value="true"/>
            <!--使用自增主键-->
            <property name="my.isgen.usekeys" value="true"/>
            <!--
            generatedKey 最多可以配置一个，用来指定自动生成主键的属性
                属性(必须)：
                    column:生成列的列名
                    sqlStatement:将返回新值的 SQL 语句
                        可用值：
                            MySql
                            SqlServer
                            JDBC:这会配置MBG使用MyBatis3支持的JDBC标准的生成key来生成代码。
                            等
            -->
            <generatedKey column="id" sqlStatement="JDBC"/>
        </table>

        <!-- <table schema="" tableName="sys_role_permission"></table> -->


        <!-- 有些表的字段需要指定java类型
         <table schema="" tableName="">
            <columnOverride column="" javaType="" />
        </table> -->
    </context>
</generatorConfiguration>