通过Java程序测试数据库连接信息 （r10笔记第64天）

import java.sql.CallableStatement;  
import java.sql.Connection;  
import java.sql.DriverManager;  
import java.sql.ResultSet;  
import java.sql.SQLException;  
import java.sql.Statement;  

public class Test {  
  
    public static void main(String[] args) {  
        String driver = "oracle.jdbc.driver.OracleDriver";  
        String url = "jdbc:Oracle:thin:@10.127.130.58:1525/tbillmob";  
        Statement stmt = null;  
        ResultSet res = null;  
        Connection conn = null;  
        CallableStatement proc = null;  
        System.out.println("JDBC URL:"+url);
        String sql = " select (select decode(value,'TRUE','YES','NO')from v$option WHERE Parameter = 'Real Application Clusters') RAC,"+
"       (select log_mode||','||database_role from v$database where rownum<2)log_mode,"+
"       (select platform_name from v$database where rownum<2)platform_name,"+
" inst_id instance_id, instance_name, host_name, version, status, startup_time "+
" from gv$instance "+
" order by inst_id";  
          
        try {  
            Class.forName(driver);  
            System.out.println(System.getProperty("java.class.path")+"n");
            conn = DriverManager.getConnection(url, "pdb_mgr", "oracle");  
            stmt = conn.createStatement();  
            res = stmt.executeQuery(sql);  
            while(res.next())  
            {  
                System.out.println("---------------------------n");
                String rac_flag = res.getString("RAC");  
                String log_mode = res.getString("LOG_MODE");                   
                String platform_name = res.getString("PLATFORM_NAME");                   
                String instance_id = res.getString("INSTANCE_ID");                   
                String instance_name = res.getString("INSTANCE_NAME");                   
                String host_name = res.getString("HOST_NAME");                   
                String version = res.getString("VERSION");                   
                String status = res.getString("STATUS");                   
                String startup_time = res.getString("STARTUP_TIME");                   
                System.out.println("RAC:t"+rac_flag+"n"
                                  +"LOG_MODE:t"+log_mode+"n"
                                  +"PLATFORM_NAME:t"+platform_name+"n"
                                  +"INSTANCE_ID:t"+instance_id+"n"
                                  +"INSTANCE_NAME:t"+instance_name+"n"
                                  +"HOST_NAME:t"+host_name+"n"
                                  +"VERSION:t"+version+"n"
                                  +"STATUS:t"+status+"n"
                                  +"STARTUP_TIME:t"+startup_time+"n");
                System.out.println("---------------------------n");
            }  
} catch (ClassNotFoundException e) {              
            e.printStackTrace();  
        } catch (SQLException e) {  
            e.printStackTrace();  
        }  
}
}