Question

我想创建一个具有两个数据库连接的应用程序，其中基于主要数据库选择了辅助数据库连接。

我已经创建了两个数据源，一个是@primary，第二个是我在首页加载后创建的，但没有用

Answer 1

i have done something like this but not able to create second one
    package com.example.edunext.Configuration;    
    import com.example.edunext.model.User;
    import com.example.edunext.model.UserDaoImpl;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Qualifier;
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.ComponentScan;
    import org.springframework.context.annotation.DependsOn;
    import org.springframework.jdbc.core.JdbcTemplate;
    import org.springframework.jdbc.datasource.DriverManagerDataSource;
    import org.springframework.stereotype.Component;

    import javax.sql.DataSource;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    import java.util.stream.Collectors;
    import java.util.stream.Stream;


    @Component
    public class Registry {
        private static final Map<String, Object> registry = new HashMap<String, Object>();

        @Autowired
        @Qualifier("jdbcTemplate1")
        private JdbcTemplate jdbcTemplate1;

        public String getdb()
        {

                String sql1 = "select email from user1";
                List<User> list1 = jdbcTemplate1.query(sql1, new UserDaoImpl.UserRowMapper());
                return list1.get(0).getEmail();
        }
        @Bean(name = "db2")
        @DependsOn("db1")
        @ConfigurationProperties(prefix = "spring.second-db")
        public DataSource dataSource2() {
            DriverManagerDataSource dataSource = new DriverManagerDataSource();
            try {



                dataSource.setDriverClassName("com.mysql.jdbc.Driver");
                String jdbcurl="jdbc:mysql://localhost:3306/"+getdb();
                dataSource.setUrl(jdbcurl);
                dataSource.setUsername("root");
                dataSource.setPassword("hrhk");
                return dataSource;
            }
            catch(Exception ex)
            {
                return dataSource;
            }
        }

        @Bean(name = "jdbcTemplate2")
        @DependsOn("jdbcTemplate1")
        public JdbcTemplate jdbcTemplate2(@Qualifier("db2") DataSource ds) {
            if(ds==null)
            {
                return null;
            }
            else {
                return new JdbcTemplate(ds);
            }
        }

    }

如何在springboot中创建两个数据源，其中辅助数据库依赖于主数据库（初始辅助数据库未知）

1 个答案: