SpringBoot專案多資料來源及mybatis 駝峰失效的問題解決方法

2022-07-06 14:04:17

1 設定多資料來源時，application.yml 的有關mybatis的設定是失效的，因為他不知道設定哪一個資料來源

2 application.yml 組態檔

server:
  # 伺服器的HTTP埠
  port: 8097
spring:
  # 設定資料來源
  datasource:
    master:
      jdbc-url: jdbc:mysql://localhost:3306/test?useSSL=false&serverTimezone=UTC
      username: root
      password: root
      driver-class-name: com.mysql.cj.jdbc.Driver
    test:
      jdbc-url: jdbc:mysql://localhost:3306/test2?useSSL=false&serverTimezone=UTC
      username: root
      password: root
      driver-class-name: com.mysql.cj.jdbc.Driver
# MyBatis設定
mybatis:
    # 搜尋指定包別名
    # (如果 typeAliasesPackage不進行設定，resultType就得寫全名resultType="com.liyh.entity.User"，
    # 但是如果設定了別名,就可以不用寫全路徑直接寫resultType="User"即可)
    type-aliases-package: com.liyh.entity
    # 設定mapper的掃描，找到所有的mapper.xml對映檔案
    mapper-locations: classpath*:mapper/**/*Mapper.xml
    # 使用駝峰命名
    # 資料庫表列：user_name
    # 實體類屬性：userName
    configuration:
      map-underscore-to-camel-case: true

3 解決方法一

1 application.yml 的設定駝峰保留

2 定義全域性的設定

@Bean
    @ConfigurationProperties(prefix = "mybatis.configuration")
    public org.apache.ibatis.session.Configuration configuration() {
        return new org.apache.ibatis.session.Configuration();
    }

3 在sqlSessionFactory中設定設定

@Primary
    @Bean(name = "masterSqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource, org.apache.ibatis.session.Configuration configuration) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource);
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath*:mapper/*.xml"));
        sqlSessionFactoryBean.setTypeAliasesPackage("com.liyh.entity");
        sqlSessionFactoryBean.setConfiguration(configuration);
        return sqlSessionFactoryBean.getObject();
    }

4 完整程式碼

package com.liyh.config;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages = {"com.liyh.mapper"}, sqlSessionFactoryRef = "masterSqlSessionFactory")
public class MybatisMasterConfig {
    @Bean(name = "masterDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.master")
    public DataSource dataSource() {
        return DataSourceBuilder.create().build();
    }
    /**
     * 設定事務管理器，不然事務不起作用
     *
     * @return
     */
    @Bean
    public PlatformTransactionManager transactionManager() {
        return new DataSourceTransactionManager(this.dataSource());
    }
    @Bean
    @ConfigurationProperties(prefix = "mybatis.configuration")
    public org.apache.ibatis.session.Configuration configuration() {
        return new org.apache.ibatis.session.Configuration();
    }
    @Primary
    @Bean(name = "masterSqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource, org.apache.ibatis.session.Configuration configuration) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource);
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath*:mapper/*.xml"));
        sqlSessionFactoryBean.setTypeAliasesPackage("com.liyh.entity");
        sqlSessionFactoryBean.setConfiguration(configuration);
        return sqlSessionFactoryBean.getObject();
    }
}

4解決方法二

1 在 sqlSessionFactory 返回的 bean 中設定駝峰

sqlSessionFactoryBean.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);

@Primary
    @Bean(name = "masterSqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource);
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath*:mapper/*.xml"));
        sqlSessionFactoryBean.setTypeAliasesPackage("com.liyh.entity");
        sqlSessionFactoryBean.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);
        return sqlSessionFactoryBean.getObject();
    }

2 完整程式碼

package com.liyh.config;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages = {"com.liyh.mapper"}, sqlSessionFactoryRef = "masterSqlSessionFactory")
public class MybatisMasterConfig {
    @Bean(name = "masterDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.master")
    public DataSource dataSource() {
        return DataSourceBuilder.create().build();
    }
    /**
     * 設定事務管理器，不然事務不起作用
     *
     * @return
     */
    @Bean
    public PlatformTransactionManager transactionManager() {
        return new DataSourceTransactionManager(this.dataSource());
    }
    @Bean
    @ConfigurationProperties(prefix = "mybatis.configuration")
    public org.apache.ibatis.session.Configuration configuration() {
        return new org.apache.ibatis.session.Configuration();
    }
    @Primary
    @Bean(name = "masterSqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource, org.apache.ibatis.session.Configuration configuration) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource);
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath*:mapper/*.xml"));
        sqlSessionFactoryBean.setTypeAliasesPackage("com.liyh.entity");
        sqlSessionFactoryBean.setConfiguration(configuration);
        return sqlSessionFactoryBean.getObject();
    }
}

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