如何從java代碼中運行或不運行h2數據庫服務器

我需要從java代碼中查找h2數據庫服務器是否正在運行。我已經試過的getStatus（）isRunning（參數）的方法，但它總是顯示服務器沒有運行，即使服務器running.Here低於我的代碼如何從java代碼中運行或不運行h2數據庫服務器

Server服務器= Server.createTcpServer（參數）。

//查找是否是服務器或不使用「isRunning（）」方法

如果（server.isRunning（假））

{ 
    System.out.println("server is running"); 
}

其他

{ 
    System.out.println("server is not running"); 

}

//使用「getStatus（）」方法查找服務器是否打開

String statVariable = server.getStatus（）;

System.out.println（「STATUS =」+ statVariable）;

System.out.println（「SERVER GONNA START」）;

server.start（）;

來源

2015-01-08 rajeesh

你正在使用什麼版本的H2？ – marcolopes

H2版本是1.4.184 – rajeesh

你能提供一些代碼嗎？你是如何開始H2服務器的？ –

也許你可以發送一個請求到有問題的端口，假設它是WebServer或TCP服務器（默認端口分別是8082或9092）。你知道呼叫

drewmac：BIN drewpierce $ java命令H2的* .jar org.h2.tools.Server

創建3個服務器和吐出類似：

TCP服務器上運行在tcp://192.168.1.3:9092（僅限本地連接）

PG服務器在運行pg://192.168.1.3:5435（僅限本地連接）

Web控制檯服務器在運行http://192.168.1.3:8082（僅限本地連接）

那麼如果調用程序，以顯示你的服務器端口，監聽套接字和我的電話是 drewmac：〜drewpierce $ 須藤lsof的-i -P | grep的-i 「聽」

java的81339 drewpierce 19U的IPv6 0xffffff800b782ac0 0t0 TCP *：（LISTEN）

java的81339 drewpierce 22U的IPv6 0xffffff800b781bc0 0t0 TCP *：（LISTEN）

java的81339 drewpierce 24U的IPv6 0xffffff8015620800 0t0 TCP *：（LISTEN）

現在如果你要測試的Web服務器（HTTP和HTML

流到端口80,8082，無論你做什麼，你都可以發佈Chunk A.如果你想測試TCP服務器，你可以發佈Chunk B.

呼叫一大塊像的Java GreetingClient本地主機8082

或類似的Java GreetingClient ec2-1-2-3-4-amaz-aws-ec2.amazon.com 8082

不要」噸忘記2個參數在該測試中，否則它將BARF

堆塊A：

import java.io.*; 
import java.net.*; 
public class GreetingClient { 
    public static void main(String[] args) { 
// declaration section: 
// mySocket: our client socket pretending to be a browser 
// os: output stream 
// is: input stream 
     Socket mySocket = null; 
     DataOutputStream os = null; 
     DataInputStream is = null; 

     String serverName = args[0]; 
     int port = Integer.parseInt(args[1]); 
// Initialization section: 
// btw make sure parameters are passed noting that this quick code is NOT 
// Try to open input and output streams 
     System.out.println("*1"); 
     try { 
      mySocket = new Socket(serverName,port); 
      os = new DataOutputStream(mySocket.getOutputStream()); 
      is = new DataInputStream(mySocket.getInputStream()); 
     } catch (UnknownHostException e) { 
      System.err.println("Don't know about host: hostname"); 
     } catch (IOException e) { 
      System.err.println("Couldn't get I/O for the connection to: hostname"); 
     } 
     System.out.println("*2"); 
// If everything has been initialized then we want to write some data 
// to the socket we have opened a connection to on port 80, 8082, whatever 
// (what the server is listening on) 
    if (mySocket != null && os != null && is != null) { 
      try { 
// pretend to be a browser and do a GET against a resource 
     System.out.println("*3"); 
     os.writeBytes("GET /index.html HTTP/1.0\r\n\r\n");  
     System.out.println("*4"); 
// wait for response from webserver, dump out response for sanity check 
       String responseLine; 
       while ((responseLine = is.readLine()) != null) { 
        System.out.println("Server: " + responseLine); 
        if (responseLine.indexOf("Ok") != -1) { 
         break; 
        } 
       } 
// clean up: 
// close the output stream 
// close the input stream 
// close the socket 
     System.out.println("*5"); 
     os.close(); 
       is.close(); 
       mySocket.close(); 
      } catch (UnknownHostException e) { 
       System.err.println("Trying to connect to unknown host: " + e); 
      } catch (IOException e) { 
       System.err.println("IOException: " + e); 
      } 
     } 
     System.out.println("*6"); 
    }   
}

組塊（至少對我來說）A輸出：

*1 
*2 
*3 
*4 
Server: HTTP/1.1 200 OK 
Server: Content-Type: text/html 
Server: Cache-Control: no-cache 
Server: Content-Length: 937 
Server: 
Server: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
Server: <!-- 
Server: Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0, 
Server: and the EPL 1.0 (http://h2database.com/html/license.html). 
Server: Initial Developer: H2 Group 
Server: --> 
Server: <html><head> 
Server:  <meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> 
Server:  <title>H2 Console</title> 
Server:  <link rel="stylesheet" type="text/css" href="stylesheet.css" /> 
Server: <script type="text/javascript"> 
Server: location.href = 'login.jsp?jsessionid=f3d05d9b68f4c5407054628f096ffccb'; 
Server: </script> 
Server: </head> 
Server: <body style="margin: 20px;"> 
Server: 
Server: <h1>Welcome to H2</h1> 
Server: <h2>No Javascript</h2> 
Server: If you are not automatically redirected to the login page, then 
Server: Javascript is currently disabled or your browser does not support Javascript. 
Server: For this application to work, Javascript is essential. 
Server: Please enable Javascript now, or use another web browser that supports it. 
Server: 
Server: </body></html> 
*5 
*6

有幾件事情，顯然這是H2輸出。塊源代碼可以減少到約10行。

組塊B（談話JDBC到TCP JDBC服務器）

//STEP 1. Import required packages 
import java.sql.*; 
import org.h2.Driver; 

public class JdbcTrial { 
    // JDBC driver name and database URL 

    //static final String JDBC_DRIVER = "com.mysql.jdbc.Driver"; 
    //static final String DB_URL = "jdbc:mysql://127.0.0.1/test"; 

    static final String JDBC_DRIVER = "org.h2.Driver"; 
    static final String DB_URL = "jdbc:h2:tcp://localhost/~/test"; 

    // Database credentials 
    static final String USER = "sa"; 
    static final String PASS = ""; 

    public static void main(String[] args) { 
    Connection conn = null; 
    Statement stmt = null; 
    try{ 
     //STEP 2: Register JDBC driver 
     System.out.println("***** 1"); 
     Class.forName(JDBC_DRIVER); 
     System.out.println("***** 2"); 

     //STEP 3: Open a connection 
     System.out.println("Connecting to database..."); 
     conn = DriverManager.getConnection(DB_URL,USER,PASS); 

     //STEP 4: Execute a query 
     System.out.println("Creating statement..."); 
     stmt = conn.createStatement(); 
     String sql; 
     sql = "SELECT id, FirstName, LastName from people"; 
     ResultSet rs = stmt.executeQuery(sql); 

     //STEP 5: Extract data from result set 
     while(rs.next()){ 
     //Retrieve by column name 
     int id = rs.getInt("id"); 
     String first = rs.getString("FirstName"); 
     String last = rs.getString("LastName"); 

     //Display values 
     System.out.print("ID: " + id); 

     System.out.print(", First: " + first); 
     System.out.println(", Last: " + last); 
     } 
     //STEP 6: Clean-up environment 
     rs.close(); 
     stmt.close(); 
     conn.close(); 
    }catch(SQLException se){ 
     //Handle errors for JDBC 
     se.printStackTrace(); 
    }catch(Exception e){ 
     //Handle errors for Class.forName 
     e.printStackTrace(); 
    }finally{ 
     //finally block used to close resources 
     try{ 
     if(stmt!=null) 
      stmt.close(); 
     }catch(SQLException se2){ 
     }// nothing we can do 
     try{ 
     if(conn!=null) 
      conn.close(); 
     }catch(SQLException se){ 
     se.printStackTrace(); 
     }//end finally try 
    }//end try 
    System.out.println("Goodbye!"); 
}//end main 
}//end FirstExample

組塊B輸出：

drewmac:~ drewpierce$ java JdbcTrial 
***** 1 
***** 2 
Connecting to database... 
Creating statement... 
ID: 1, First: joan, Last: london 
ID: 2, First: Sgt., Last: Corholio 
Goodbye!

工作得很好對MySQL和MariaDB的，和H2，只是通過與jdbc_driver和db_url搞亂

你可以做套接字連接，而不是發出數據檢索調用，真正修剪它。

至於如何用H2 getStatus做到這一點，我不知道。祝你好運。

來源

2015-01-11 03:55:34 Drew

如何從java代碼中運行或不運行h2數據庫服務器

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