SpringBoot2.0 base case (06): introducing JdbcTemplate, and multi data source configuration

A, JdbcTemplate objects

1, JdbcTemplate Profile

Data source disposed in the case and accessing the frame Spring Boot2.0 database through JdbcTemplate.
SpringBoot operation of the database in jdbc did a deep package, using the spring injection feature, you can register the DataSource into JdbcTemplate.

2, JdbcTemplate core methods

1)execute方法：可以用于执行任何SQL语句；
2)update方法batchUpdate方法：update方法用于执行新增、修改、删除等语句；batchUpdate方法用于执行批处理相关语句；
3)query方法及queryFor方法：用于执行查询相关语句；
4)call方法：用于执行存储过程、函数相关语句。

Two, SpringBoot2 in usage

1, into Jar package

<!-- 数据库依赖 -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.21</version>
</dependency>
<!-- JDBC 依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

2, the configuration information of the data source

spring:
  application:
    # 应用名称
    name: node06-boot-jdbc
  datasource:
    # 数据源一：data_one 库
    primary:
      # 2.0开始的版本必须这样配置
      jdbc-url: jdbc:mysql://localhost:3306/data_one
      #url: jdbc:mysql://localhost:3306/data_one
      username: root
      password: 123
      driver-class-name: com.mysql.jdbc.Driver
    # 数据源二：data_two 库
    secondary:
      # 2.0开始的版本必须这样配置
      jdbc-url: jdbc:mysql://localhost:3306/data_two
      #url: jdbc:mysql://localhost:3306/data_two
      username: root
      password: 123
      driver-class-name: com.mysql.jdbc.Driver

3, the data source configured

1) a data source arrangement
@Primary annotation indicates that the data source as the default master database.

/**
 * 数据源一配置
 */
@Configuration
public class DataOneConfig {

    @Primary    // 主数据库
    @Bean(name = "primaryDataSource")
    @Qualifier("primaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.primary")
    public DataSource primaryDataSource (){
        return DataSourceBuilder.create().build() ;
    }

    @Bean(name = "primaryJdbcTemplate")
    public JdbcTemplate primaryJdbcTemplate (
            @Qualifier("primaryDataSource") DataSource dataSource){
        return new JdbcTemplate(dataSource);
    }
}

2) the data source disposed two

/**
 * 数据源二配置
 */
@Configuration
public class DataTwoConfig {
    @Bean(name = "secondaryDataSource")
    @Qualifier("secondaryDataSource")
    @ConfigurationProperties(prefix="spring.datasource.secondary")
    public DataSource secondaryDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "secondaryJdbcTemplate")
    public JdbcTemplate secondaryJdbcTemplate(
            @Qualifier("secondaryDataSource") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }
}

4, write a simple test class

@RestController
public class JdbcController {
    private static final Logger LOG = LoggerFactory.getLogger(JdbcController.class);

    // 数据源一
    @Autowired
    @Qualifier("primaryJdbcTemplate")
    private JdbcTemplate primaryJdbcTemplate ;

    // 数据源二
    @Autowired
    @Qualifier("secondaryJdbcTemplate")
    private JdbcTemplate secondaryJdbcTemplate ;

    /**
     * 多数据源查询
     */
    @RequestMapping("/queryData")
    public String queryData (){
        String sql = "SELECT COUNT(1) FROM d_phone" ;
        Integer countOne = primaryJdbcTemplate.queryForObject(sql,Integer.class) ;
        Integer countTwo = secondaryJdbcTemplate.queryForObject(sql,Integer.class) ;
        LOG.info("countOne=="+countOne+";;countTwo=="+countTwo);
        return "SUCCESS" ;
    }
}

Third, the source address

GitHub地址：知了一笑
https://github.com/cicadasmile/spring-boot-base
码云地址：知了一笑
https://gitee.com/cicadasmile/spring-boot-base