spring boot mybatis datasource配置

一、加載mybatis的配置

1、手寫配置，寫死在代碼裏

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import java.io.IOException; import java.util.Properties;   import javax.sql.DataSource;   import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.ibatis.plugin.Interceptor; import org.apache.ibatis.session.SqlSessionFactory; import org.mybatis.spring.SqlSessionFactoryBean; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.DefaultResourceLoader; import org.springframework.core.io.Resource; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.jdbc.datasource.DataSourceTransactionManager; import org.springframework.transaction.PlatformTransactionManager; import org.springframework.transaction.annotation.EnableTransactionManagement; import org.springframework.transaction.annotation.TransactionManagementConfigurer;   import com.github.pagehelper.PageHelper;   @Configuration @EnableTransactionManagement public class MybatisConfiguration implements TransactionManagementConfigurer{       private static Log logger = LogFactory.getLog(MybatisConfiguration.class);       @Autowired     private DataSource dataSource;       // 提供SqlSeesion     @Bean(name = "sqlSessionFactory")     public SqlSessionFactory sqlSessionFactoryBean() {         try {             SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();             sessionFactoryBean.setDataSource(dataSource);             // 手寫配置             // 配置類型別名             sessionFactoryBean.setTypeAliasesPackage("com.zsx.entity");               // 配置mapper的掃描，找到所有的mapper.xml映射文件             Resource[] resources = new PathMatchingResourcePatternResolver()                     .getResources("classpath:mybatis/mapper/*.xml");             sessionFactoryBean.setMapperLocations(resources);               // 加載全局的配置文件             sessionFactoryBean.setConfigLocation(                     new DefaultResourceLoader().getResource("classpath:mybatis/mybatis-config.xml"));               //添加插件             sessionFactoryBean.setPlugins(new Interceptor[]{pageHelper()});               return sessionFactoryBean.getObject();         } catch (IOException e) {             logger.warn("mybatis resolver mapper*xml is error");             return null;         } catch (Exception e) {             logger.warn("mybatis sqlSessionFactoryBean create error");             return null;         }     }         @Bean     public PlatformTransactionManager annotationDrivenTransactionManager() {         return new DataSourceTransactionManager(dataSource);     }         @Bean     public PageHelper pageHelper(){         logger.info("MyBatis分頁插件PageHelper");         //分頁插件         PageHelper pageHelper = new PageHelper();         Properties properties = new Properties();         properties.setProperty("offsetAsPageNum", "true");         properties.setProperty("rowBoundsWithCount", "true");         properties.setProperty("reasonable", "true");         properties.setProperty("supportMethodsArguments", "true");         properties.setProperty("returnPageInfo", "check");         properties.setProperty("params", "count=countSql");         pageHelper.setProperties(properties);         return pageHelper;     }     }

2、讀取配置文件方式

先在配置文件application.yml中添加

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# MyBatis mybatis:     # 配置類型別名     typeAliasesPackage: com.zsx.entity     # 配置mapper的掃描，找到所有的mapper.xml映射文件     mapperLocations: classpath:mybatis/mapper/*.xml     # 加載全局的配置文件     configLocation: classpath:mybatis/mybatis-config.xml

然後配置文件爲：

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import java.io.IOException;   import javax.sql.DataSource;   import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.ibatis.session.SqlSessionFactory; import org.mybatis.spring.SqlSessionFactoryBean; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.DefaultResourceLoader; import org.springframework.core.io.Resource; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.jdbc.datasource.DataSourceTransactionManager; import org.springframework.transaction.PlatformTransactionManager; import org.springframework.transaction.annotation.EnableTransactionManagement; import org.springframework.transaction.annotation.TransactionManagementConfigurer;   @Configuration @EnableTransactionManagement public class MybatisConfiguration implements TransactionManagementConfigurer{       private static Log logger = LogFactory.getLog(MybatisConfiguration.class);   //  配置類型別名     @Value("${mybatis.typeAliasesPackage}")     private String typeAliasesPackage;   //  配置mapper的掃描，找到所有的mapper.xml映射文件     @Value("${mybatis.mapperLocations}")     private String mapperLocations;   //  加載全局的配置文件     @Value("${mybatis.configLocation}")     private String configLocation;       @Autowired     private DataSource dataSource;     // DataSource配置 //  @Bean //  @ConfigurationProperties(prefix = "spring.datasource") //  public DruidDataSource dataSource() { //      return new com.alibaba.druid.pool.DruidDataSource(); //  }       // 提供SqlSeesion     @Bean(name = "sqlSessionFactory")     public SqlSessionFactory sqlSessionFactoryBean() {         try {             SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();             sessionFactoryBean.setDataSource(dataSource);               // 讀取配置             sessionFactoryBean.setTypeAliasesPackage(typeAliasesPackage);               //             Resource[] resources = new PathMatchingResourcePatternResolver()                     .getResources(mapperLocations);             sessionFactoryBean.setMapperLocations(resources); //      //             sessionFactoryBean.setConfigLocation(                     new DefaultResourceLoader().getResource(configLocation));               //添加插件  （改爲使用配置文件加載了） //          sqlSessionFactoryBean.setPlugins(new Interceptor[]{pageHelper()});               return sessionFactoryBean.getObject();         } catch (IOException e) {             logger.warn("mybatis resolver mapper*xml is error");             return null;         } catch (Exception e) {             logger.warn("mybatis sqlSessionFactoryBean create error");             return null;         }     }     //  @Bean //    public SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) { //        return new SqlSessionTemplate(sqlSessionFactory); //    }   //  @Bean //  public PlatformTransactionManager transactionManager(){ //      return new DataSourceTransactionManager(dataSource); //  }         @Bean     public PlatformTransactionManager annotationDrivenTransactionManager() {         return new DataSourceTransactionManager(dataSource);     }     }

最後還有配置一個掃描mapper的類：

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import org.mybatis.spring.mapper.MapperScannerConfigurer; import org.springframework.boot.autoconfigure.AutoConfigureAfter; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration;   @Configuration //TODO 注意，由於MapperScannerConfigurer執行的比較早，所以必須有下面的註解 @AutoConfigureAfter({MybatisConfiguration.class}) public class MyBatisMapperScannerConfig {       @Bean     public MapperScannerConfigurer mapperScannerConfigurer(){         MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();           mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactory");         mapperScannerConfigurer.setBasePackage("com.zsx.dao");             return mapperScannerConfigurer;     }   }

還有一個 mybatis-config.xml

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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration         PUBLIC "-//mybatis.org//DTD Config 3.0//EN"         "https://mybatis.org/dtd/mybatis-3-config.dtd">   <configuration>     <properties>         <property name="dialect" value="mysql" />     </properties>     <settings>         <!-- 開啓駝峯匹配 -->         <setting name="mapUnderscoreToCamelCase" value="true"/>         <!-- 這個配置使全局的映射器啓用或禁用緩存。系統默認值是true，設置只是爲了展示出來 -->         <setting name="cacheEnabled" value="true" />         <!-- 全局啓用或禁用延遲加載。當禁用時，所有關聯對象都會即時加載。 系統默認值是true，設置只是爲了展示出來 -->         <setting name="lazyLoadingEnabled" value="true" />         <!-- 允許或不允許多種結果集從一個單獨的語句中返回（需要適合的驅動）。 系統默認值是true，設置只是爲了展示出來 -->         <setting name="multipleResultSetsEnabled" value="true" />         <!--使用列標籤代替列名。不同的驅動在這方便表現不同。參考驅動文檔或充分測試兩種方法來決定所使用的驅動。 系統默認值是true，設置只是爲了展示出來 -->         <setting name="useColumnLabel" value="true" />         <!--允許 JDBC 支持生成的鍵。需要適合的驅動。如果設置爲 true 則這個設置強制生成的鍵被使用，儘管一些驅動拒絕兼容但仍然有效（比如             Derby）。 系統默認值是false，設置只是爲了展示出來 -->         <setting name="useGeneratedKeys" value="false" />         <!--配置默認的執行器。SIMPLE 執行器沒有什麼特別之處。REUSE 執行器重用預處理語句。BATCH 執行器重用語句和批量更新 系統默認值是SIMPLE，設置只是爲了展示出來 -->         <setting name="defaultExecutorType" value="SIMPLE" />         <!--設置超時時間，它決定驅動等待一個數據庫響應的時間。 系統默認值是null，設置只是爲了展示出來 -->         <setting name="defaultStatementTimeout" value="25000" />     </settings>       <!-- 分頁助手 -->     <plugins>         <plugin interceptor="com.github.pagehelper.PageHelper">             <!-- 數據庫方言 -->             <property name="dialect" value="mysql" />             <property name="offsetAsPageNum" value="true" />             <!-- 設置爲true時，使用RowBounds分頁會進行count查詢 會去查詢出總數 -->             <property name="rowBoundsWithCount" value="true" />             <property name="pageSizeZero" value="true" />             <property name="reasonable" value="true" />         </plugin>     </plugins> </configuration>