使用像在java中的sql

Question

我做了一個過程，得到一個nvarchar，它使用like返回一個表，它運作良好。但是當我想在java中使用這個過程時，它不起作用。 這裏是java代碼。

String query = "exec Predict ?"; 
    pst = conn.prepareStatement(query); 
    pst.setString(1, "%"+"ee"+"%"); 

    rs = pst.executeQuery(); 
    int i = 0; 
    while (rs.next()) { 
    System.out.println(rs.getString(1)); 
    i++; 
    } 

Answer 1

嘿，你實際上不能把它稱爲查詢。你必須使它成爲一個可調用的語句並執行它。這是我一直在使用的代碼。它也需要參數，但如果你不需要，只需刪除它。這是爲我的項目設置定製的，但這會幫助你：

/** 
    * This method takes in a stored procedure along with its parameters and parameter type and creates a result set from them. 
    * @param storedProcedure 
    * @param parameters 
    * @param parameterType 
    * @return 
    * @throws SQLException 
    */ 
    public static ResultSet createRSFromStoredProc(String storedProcedure, ArrayList<String> parameters, ArrayList<String> parameterType) throws SQLException { 

     // Initializes variables that are used in the method. 
     Connection dbConnection = null; 
     CallableStatement callableStatement = null; 
     ResultSet rs = null; 

     // Builds the stored procedure calling 
     String insertStoreProc = "{call " + storedProcedure + "("; 
     for(int i=0;i<parameters.size(); i++) 
     { 
      if(i==parameters.size()-1) 
       insertStoreProc+="?"; 
      else 
       insertStoreProc+="?,"; 
     } 
     insertStoreProc+=")}"; 


     try { 
      // establishes the connection 
      dbConnection = getDBConnection(); 

      // creates the callable statement 
      callableStatement = dbConnection.prepareCall(insertStoreProc); 

      // Parses the string into the correct parameter type and sets the parameter to the value. 
      for(int i=0;i<parameters.size(); i++) 
      { 
       if(parameterType.get(i).equals("string")) 
        callableStatement.setString(i+1, parameters.get(i)); 
       else if(parameterType.get(i).equals("int")) 
        callableStatement.setInt(i+1, Integer.parseInt(parameters.get(i))); 
       if(parameterType.get(i).equals("dateTime")) 
       { 
        // if now is entered for the time gets the current timestamp 
        if(parameters.get(i).equals("now")) 
         callableStatement.setTimestamp(i+1, Timestamp.valueOf(getCurrentDate())); 
        else 
        { 
         callableStatement.setString(i+1, parameters.get(i)); 
        } 

       } 
      } 

      // execute insertDBUSER store procedure 
      Boolean results = callableStatement.execute(); 
      int rowsAffected=0; 
      while(results||rowsAffected!=-1) 
      { 
       if(results) 
       { 
        rs=callableStatement.getResultSet(); 
        break; 
       } 
       else 
       { 
        rowsAffected=callableStatement.getUpdateCount(); 
       } 
       results= callableStatement.getMoreResults(); 
      } 


     } catch (SQLException e) { 

      System.out.println(e.getMessage()); 

     } 
     return rs; 

    }