Java - jdbc

首先配置maven包

<dependency><!-- jdbc -->
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency><!--mybatis-->
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.0</version>
</dependency>

注意pom.xml中配置 结点

<resources>
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
    </resource>
    <resource>
        <directory>src/main/resources</directory>
        <includes>
            <include>static/*.*</include>
            <include>templates/*.*</include>
            <include>**/*.xml</include>
            <include>**/*.yml</include>
            <include>**/*.properties</include>
        </includes>
        <filtering>false</filtering>
    </resource>
</resources>

针对不同的数据库，引入对应的包：SqlServer-sqljdbc4，DB2-db2jcc4
以SqlServer为例

@MapperScan(basePackages = "com.cmb.**.mapper.sqlserver", sqlSessionFactoryRef = "sqlserverSqlSessionFactoryBean")
@SpringBootConfiguration
public class SqlserverDataSourceConfiguration {
    private static String jdbcUrl, jdbcUser, jdbcPassword, maximumPoolSize;
    static { ... }

    @Bean(name = "sqlserverDataSource")
    public DataSource createDataSource() {
        return DataSourceConfig.getHikariDataSourceInstance(jdbcUrl, jdbcUser, jdbcPassword, maximumPoolSize);
    }
}

@Configuration
public class SqlserverSessionFactoryConfiguration {
    @Autowired
    @Qualifier(value = "sqlserverDataSource")
    private DataSource sqlserverDataSource;
    private String mapperXmlConfigPath = "/mapperconfig/sqlserver/**.xml", mapperPackagePath = "com.cmb.**.mapper.sqlserver";

    @Bean(name = "sqlserverSqlSessionFactoryBean")
    public SqlSessionFactoryBean createSqlSessionFactory() throws Exception {
        return DataSourceConfig.getSqlSessionFactoryBeanInstance(mapperXmlConfigPath, mapperPackagePath, sqlserverDataSource);
    }
}

其中，DataSourceConfig工具类

public static HikariDataSource getHikariDataSourceInstance(String jdbcUrl, String jdbcUser, String jdbcPassword, String maximumPoolSize) {
    HikariDataSource source = new HikariDataSource();
    source.setJdbcUrl(jdbcUrl);
    source.setUsername(jdbcUser);
    source.setPassword(jdbcPassword);
    source.setMaximumPoolSize(Integer.valueOf(maximumPoolSize));
    return source;
}
public static SqlSessionFactoryBean getSqlSessionFactoryBeanInstance(String mapperXmlConfigPath, String mapperPackagePath, DataSource ds) throws Exception {
    SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
    PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
    String xmlConfigPath = PathMatchingResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + mapperXmlConfigPath;
    bean.setMapperLocations(resolver.getResources(xmlConfigPath));//设置mapper对应的XML文件的路径 
    bean.setDataSource(ds);//设置数据源
    bean.setTypeAliasesPackage(mapperPackagePath);//设置mapper接口所在的包
    bean.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);
    return bean;
}