使用JDBC將Android連接到SQL Server

Question

我目前正在爲Android創建一個應用程序，該應用程序應該將其數據同步到MSSQL Server 2008中。我目前正在測試使其工作的方式，因爲我之前從未做過它。我應該提到，只要設備連接到USB端口，而不是通過WiFi，設備就會同步，因爲公司不希望在網絡上註冊設備。

到目前爲止，我已經制定出將Java連接到SQL Server。這是一個簡單的選擇代碼（我目前使用的SQLExpress測試）：

String connectionUrl = "jdbc:sqlserver://127.0.0.1:1433;" + 
      "databaseName=Android;integratedSecurity=true;"; 

    // Declare the JDBC objects. 
    Connection con = null; 
    Statement stmt = null; 
    ResultSet rs = null; 

    try { 
    // Establish the connection. 
    Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); 
    con = DriverManager.getConnection(connectionUrl); 

    // Create and execute an SQL statement that returns some data. 
    String SQL = "SELECT * FROM AndroidTest;"; 
    stmt = con.createStatement(); 
    rs = stmt.executeQuery(SQL); 

    // Iterate through the data in the result set and display it. 
    while (rs.next()) { 
     System.out.println(rs.getString(1) + " " + rs.getString(2)); 
    } 
    } 

    // Handle any errors that may have occurred. 
    catch (Exception e) { 
    e.printStackTrace(); 
    } 
    finally { 
    if (rs != null) try { rs.close(); } catch(Exception e) {} 
    if (stmt != null) try { stmt.close(); } catch(Exception e) {} 
    if (con != null) try { con.close(); } catch(Exception e) {} 
    } 

現在，我已經嘗試過同樣的事情在Android的，這就是它的樣子：

package com.example.testsqlserver; 

import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.Statement; 

import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Menu; 
import android.view.View; 
import android.widget.EditText; 

public class MainActivity extends Activity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.activity_main, menu); 
     return true; 
    } 

    public void clickSend(View view) { 
     (new Thread(new TestThread())).start(); 
    } 
    public class TestThread extends Thread { 
     public void run() { 
      String connectionUrl = "jdbc:sqlserver://127.0.0.1:1433;" + 
        "databaseName=Android;integratedSecurity=true;"; 

      // Declare the JDBC objects. 
      Connection con = null; 
      Statement stmt = null; 

      try { 
      // Establish the connection. 
      Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); 
      con = DriverManager.getConnection(connectionUrl); 

      //Get information from EditText 
      EditText txtTest = (EditText)findViewById(R.id.txtTest); 
      EditText txtName = (EditText)findViewById(R.id.txtName); 
      String test = txtTest.getText().toString(); 
      String name = txtName.getText().toString(); 

      // Create and execute an SQL statement that returns some data. 
      String SQL = "INSERT INTO AndroidTest VALUES('" + test + "', '" + name + "');"; 
      stmt = con.createStatement(); 
      stmt.executeUpdate(SQL); 
      Log.e("Success", "Success"); 
      } 

      // Handle any errors that may have occurred. 
      catch (Exception e) { 
      e.printStackTrace(); 
       Log.e("Error", e.toString()); 
      } 
      finally { 
      if (stmt != null) try { stmt.close(); } catch(Exception e) {} 
      if (con != null) try { con.close(); } catch(Exception e) {} 
      } 
     } 

     public void main(String args[]) { 
      (new TestThread()).start(); 
     } 
    } 
} 

在第一個例子是完美的作品，但在第二個例子中它給了我這個錯誤：

12-17 20:15:12.589: E/Error(1668): com.microsoft.sqlserver.jdbc.SQLServerException: The TCP/IP connection to the host 127.0.0.1, port 1433 has failed. Error: "failed to connect to /127.0.0.1 (port 1433) after 403ms: isConnected failed: ECONNREFUSED (Connection refused). Verify the connection properties, check that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port, and that no firewall is blocking TCP connections to the port.".

我有這樣的錯誤，我第一次遇到的第一個代碼，我只是不得不啓用端口1433的SQL Server設置。但我不明白爲什麼它不在第二張桌子上工作。它是相同的代碼，唯一的區別是它是通過按下按鈕執行的，並且我已經將它在單獨的線程上運行。

任何幫助將不勝感激，謝謝。

Answer 1

在Emulator Netorking上查看此部分。

您需要使用10.0.2.2，它允許您從仿真器與開發機器127.0.0.1地址進行通信。

您可能還必須執行一些端口重定向（請參閱該文檔中的進一步內容）。