基于连接可用性的spring连接到数据库
在一个应用程序中,我们有三个数据库服务器基于连接可用性的spring连接到数据库,spring,jdbc,Spring,Jdbc,在一个应用程序中,我们有三个数据库服务器 1.db1 2.db2 3.db3 我们已经为上述连接配置了jndi 如果db1中没有连接,那么从db2应用程序将建立连接,如果db2中没有连接,那么应用程序将在db2中建立连接。服务器的详细信息 tomcat 8.0服务器、spring 4.0、oracle这是您的问题的一个示例,您可以参考此源代码 应用程序属性 spring.ds_items.driverClassName=org.postgresql.Driver spring.ds_items
1.db1 2.db2 3.db3 我们已经为上述连接配置了jndi 如果db1中没有连接,那么从db2应用程序将建立连接,如果db2中没有连接,那么应用程序将在db2中建立连接。服务器的详细信息
tomcat 8.0服务器、spring 4.0、oracle这是您的问题的一个示例,您可以参考此源代码 应用程序属性
spring.ds_items.driverClassName=org.postgresql.Driver
spring.ds_items.url=jdbc:postgresql://srv0/test
spring.ds_items.username=test0
spring.ds_items.password=test0
spring.ds_users.driverClassName=org.postgresql.Driver
spring.ds_users.url=jdbc:postgresql://srv1/test
spring.ds_users.username=test1
spring.ds_users.password=test1
DatabaseItemsConfig.java
import javax.sql.DataSource;
@Configuration
@ConfigurationProperties(name = "spring.ds_items")
public class DatabaseItemsConfig extends TomcatDataSourceConfiguration {
@Bean(name = "dsItems")
public DataSource dataSource() {
return super.dataSource();
}
@Bean(name = "jdbcItems")
public JdbcTemplate jdbcTemplate(DataSource dsItems) {
return new JdbcTemplate(dsItems);
}
}
import javax.sql.DataSource;
@Configuration
@ConfigurationProperties(name = "spring.ds_users")
public class DatabaseUsersConfig extends TomcatDataSourceConfiguration {
@Bean(name = "dsUsers")
public DataSource dataSource() {
return super.dataSource();
}
@Bean(name = "jdbcUsers")
public JdbcTemplate jdbcTemplate(DataSource dsUsers) {
return new JdbcTemplate(dsUsers);
}
}
DatabaseUsersConfig.java
import javax.sql.DataSource;
@Configuration
@ConfigurationProperties(name = "spring.ds_items")
public class DatabaseItemsConfig extends TomcatDataSourceConfiguration {
@Bean(name = "dsItems")
public DataSource dataSource() {
return super.dataSource();
}
@Bean(name = "jdbcItems")
public JdbcTemplate jdbcTemplate(DataSource dsItems) {
return new JdbcTemplate(dsItems);
}
}
import javax.sql.DataSource;
@Configuration
@ConfigurationProperties(name = "spring.ds_users")
public class DatabaseUsersConfig extends TomcatDataSourceConfiguration {
@Bean(name = "dsUsers")
public DataSource dataSource() {
return super.dataSource();
}
@Bean(name = "jdbcUsers")
public JdbcTemplate jdbcTemplate(DataSource dsUsers) {
return new JdbcTemplate(dsUsers);
}
}
ItemRepository.java
import java.sql.ResultSet;
import java.sql.SQLException;
@Repository
public class ItemRepository {
protected final Logger log = LoggerFactory.getLogger(getClass());
@Autowired
@Qualifier("jdbcItems")
protected JdbcTemplate jdbc;
public Item getItem(long id) {
return jdbc.queryForObject("SELECT * FROM sb_item WHERE id=?", itemMapper, id);
}
private static final RowMapper<Item> itemMapper = new RowMapper<Item>() {
public Item mapRow(ResultSet rs, int rowNum) throws SQLException {
Item item = new Item(rs.getLong("id"), rs.getString("title"));
item.price = rs.getDouble("id");
return item;
}
};
}
import java.sql.ResultSet;
import java.sql.SQLException;
@Repository
public class UserRepository {
protected final Logger log = LoggerFactory.getLogger(getClass());
@Autowired
@Qualifier("jdbcUsers")
protected JdbcTemplate jdbc;
public User getUser(long id) {
return jdbc.queryForObject("SELECT * FROM sb_user WHERE id=?", userMapper, id);
}
private static final RowMapper<User> userMapper = new RowMapper<User>() {
public User mapRow(ResultSet rs, int rowNum) throws SQLException {
User user = new User(rs.getLong("id"), rs.getString("name"));
user.alias = rs.getString("alias");
return user;
}
};
}
导入java.sql.ResultSet;
导入java.sql.SQLException;
@存储库
公共类ItemRepository{
受保护的最终记录器日志=LoggerFactory.getLogger(getClass());
@自动连线
@限定符(“jdbcItems”)
受保护的jdbc模板jdbc;
公共项getItem(长id){
返回jdbc.queryForObject(“从sb_项中选择*,其中id=?”,itemMapper,id);
}
私有静态最终行映射器itemMapper=新行映射器(){
公共项mapRow(ResultSet rs,int rowNum)抛出SQLException{
项目=新项目(rs.getLong(“id”)、rs.getString(“title”);
item.price=rs.getDouble(“id”);
退货项目;
}
};
}
UserRepository.java
import java.sql.ResultSet;
import java.sql.SQLException;
@Repository
public class ItemRepository {
protected final Logger log = LoggerFactory.getLogger(getClass());
@Autowired
@Qualifier("jdbcItems")
protected JdbcTemplate jdbc;
public Item getItem(long id) {
return jdbc.queryForObject("SELECT * FROM sb_item WHERE id=?", itemMapper, id);
}
private static final RowMapper<Item> itemMapper = new RowMapper<Item>() {
public Item mapRow(ResultSet rs, int rowNum) throws SQLException {
Item item = new Item(rs.getLong("id"), rs.getString("title"));
item.price = rs.getDouble("id");
return item;
}
};
}
import java.sql.ResultSet;
import java.sql.SQLException;
@Repository
public class UserRepository {
protected final Logger log = LoggerFactory.getLogger(getClass());
@Autowired
@Qualifier("jdbcUsers")
protected JdbcTemplate jdbc;
public User getUser(long id) {
return jdbc.queryForObject("SELECT * FROM sb_user WHERE id=?", userMapper, id);
}
private static final RowMapper<User> userMapper = new RowMapper<User>() {
public User mapRow(ResultSet rs, int rowNum) throws SQLException {
User user = new User(rs.getLong("id"), rs.getString("name"));
user.alias = rs.getString("alias");
return user;
}
};
}
导入java.sql.ResultSet;
导入java.sql.SQLException;
@存储库
公共类用户存储库{
受保护的最终记录器日志=LoggerFactory.getLogger(getClass());
@自动连线
@限定符(“jdbcUsers”)
受保护的jdbc模板jdbc;
公共用户getUser(长id){
返回jdbc.queryForObject(“从sb_用户中选择*id=?”,userMapper,id);
}
私有静态最终行映射器userMapper=新行映射器(){
公共用户mapRow(ResultSet rs,int rowNum)抛出SQLException{
User User=新用户(rs.getLong(“id”)、rs.getString(“name”);
user.alias=rs.getString(“别名”);
返回用户;
}
};
}
谢谢。如何在dao layerI中使用它我是这样使用它的你可以参考编辑后的文章。谢谢。如何在dao层中使用它,即基于连接的可用性。我需要调用适当的jdbctemplate