如何使用ProcessBuilder運行MySQL腳本？

Question

我有一個SQL腳本，我想從一個運行在Windows上的Java類執行。目前我正在試圖在下面的函數來做到這一點使用ProcessBuilder：

public static boolean runSqlScript(String filename, String user, String password) { 
    ProcessBuilder pb = new ProcessBuilder("mysql", "-u"+user, "-p"+password, "< "+ filename); 
    try { 
     Process pr = pb.start(); 
     BufferedReader errors = new BufferedReader(new InputStreamReader(pr.getErrorStream())); 
     BufferedReader output = new BufferedReader(new InputStreamReader(pr.getInputStream())); 
     while (pr.isAlive()) { 
      try { 
       System.err.println(errors.readLine()); 
       System.out.println(output.readLine()); 
       Thread.sleep(10); 
      } catch (InterruptedException e) { 
       break; 
      } 
     } 
     System.err.println(errors.readLine()); 
     System.out.println(output.readLine()); 

     int status = pr.exitValue(); 
     return (status == 0); 
    } catch (IOException e) { 
     System.err.println("Error running command: " + e.getMessage()); 
     return false; 
    } 
} 

的文件名是腳本的絕對路徑，以及用戶名和密碼驗證正確。但是，當我運行它，我得到的錯誤：

ERROR 1102 (42000): Incorrect database name '< c:/path/to/script.sql' 

爲什麼解釋，作爲一個數據庫名稱，而不是一個命令行參數？我可以使用ProcessBuilder來運行這樣的腳本嗎？

Answer 1

Runtime.exec()也可以用來發送命令，這似乎並不具有相同的問題，因爲ProcessBuilder：

public static boolean runSqlScriptRuntime(String filename, String user, String password) { 
    Runtime rt = Runtime.getRuntime(); 
    try { 
     String cmd = "cmd /c mysql -u " + user + " -p" + password + " < " + filename; 
     System.out.println(cmd); 
     Process pr = rt.exec(cmd); 
     BufferedReader errors = new BufferedReader(new InputStreamReader(pr.getErrorStream())); 
     BufferedReader output = new BufferedReader(new InputStreamReader(pr.getInputStream())); 
     while (pr.isAlive()) { 
      try { 
       System.err.println(errors.readLine()); 
       System.out.println(output.readLine()); 
       Thread.sleep(10); 
      } catch (InterruptedException e) { 
       break; 
      } 
     } 
     System.err.println(errors.readLine()); 
     System.out.println(output.readLine()); 

     int status = pr.exitValue(); 
     return (status == 0); 
    } catch (IOException e) { 
     System.err.println("Error running command: " + e.getMessage()); 
     return false; 
    } 
} 

替代嘗試模擬命令行參數是從mysql內部調用SQL腳本，如here所述。

public static boolean runSqlScript(String filename, String user, String password) { 
    ProcessBuilder pb = new ProcessBuilder("mysql", "-u"+user, "-p"+password); 
    try { 
     Process pr = pb.start(); 
     BufferedReader errors = new BufferedReader(new InputStreamReader(pr.getErrorStream())); 
     BufferedReader output = new BufferedReader(new InputStreamReader(pr.getInputStream())); 
     BufferedWriter input = new BufferedWriter(new OutputStreamWriter(pr.getOutputStream())); 
     input.write("source " + filename + ";"); 
     input.flush(); 
     input.write("quit;"); 
     input.flush(); 
     input.close(); 
     while (pr.isAlive()) { 
      try { 
       System.err.println(errors.readLine()); 
       System.out.println(output.readLine()); 
       Thread.sleep(10); 
      } catch (InterruptedException e) { 
       break; 
      } 
     } 
     System.err.println(errors.readLine()); 
     System.out.println(output.readLine()); 

     int status = pr.exitValue(); 
     return (status == 0); 
    } catch (IOException e) { 
     System.err.println("Error running command: " + e.getMessage()); 
     return false; 
    } 
} 

這將運行MySQL，然後調用腳本。不過，我最初使用的是ProcessBuilder，因爲我認爲腳本可以在一個命令行中處理 - 使用這樣的解決方案，使用JDBC可能更有意義。

Answer 2

您需要添加數據庫名稱，也將努力ProcessBuilder pb = new ProcessBuilder("cmd", "/c", "mysql", "-u"+user, "-p"+password,"dbname", " < "+ filename);