在SQL查詢

Question

我工作的一個小練習使用jDateChooser，使用ORACLE人力資源數據庫和Netbeans的，我要計算使用搜索兩個按鈕jDateChooser值之間的差值，這裏是我的截圖JFrame的這說明了一切，包括我的輸出誤差：

http://prnt.sc/d7k538 http://image.prntscr.com/image/6e305fee272d40c3b2b9845febf5a651.png

這裏是我的代碼：

import java.util.*; 
import java.sql.*; 
import java.text.DateFormat; 
import java.text.SimpleDateFormat; 
import javax.swing.*; 
import javax.swing.table.DefaultTableModel; 


public class Exercise extends javax.swing.JFrame { 

    Connection Con = myConn.getCon(); 
    Statement St = null; 
    ResultSet Rs = null; 

    String tab[] = {"LAST_NAME", "FIRST_NAME", "JOB_TITLE", "DEPARTMENT_NAME", "SALARY"}; 
    DefaultTableModel dtm = new DefaultTableModel(tab, 0); 

    public Exercise() { 
     initComponents(); 

     jTable1.setModel(dtm); 

     fill_combo_job(); 
     fill_combo_dept(); 

     int Rc = dtm.getRowCount(); 
     row_count_label.setText(Integer.toString(Rc)); 
    } 

    public void fill_combo_job(){ 

      try{ 
      //Getting data from table JOBS 

      St = Con.createStatement(); 
      Rs = St.executeQuery("SELECT DISTINCT JOB_ID FROM JOBS"); 

      //Filling our jcombobox 

      while(Rs.next()){ 
       job_id_combo.addItem(Rs.getString("JOB_ID")); 
      } 

     }catch(Exception ex){ 

      System.out.println(ex.toString()); 
    } 
    } 

    private void fill_combo_dept(){ 

     try{ 

      St = Con.createStatement(); 
      Rs = St.executeQuery("SELECT DISTINCT DEPARTMENT_ID FROM EMPLOYEES WHERE DEPARTMENT_ID IS NOT NULL ORDER BY DEPARTMENT_ID"); 

      while(Rs.next()){ 
       dept_id_combo.addItem(Rs.getString("DEPARTMENT_ID")); 
      } 

     }catch(Exception ex){ 

      System.out.println(ex.toString()); 
     } 

    } 

    private void search_btn(){ 

     DateFormat df = new SimpleDateFormat("dd/MM/yyyy"); 
     String date1 = df.format(jDateChooser1.getDate()); 
     String date2 = df.format(jDateChooser2.getDate()); 



     try{ 

    St = Con.createStatement(); 
    Rs = St.executeQuery("SELECT e.LAST_NAME, e.FIRST_NAME, j.JOB_TITLE, d.DEPARTMENT_NAME, e.SALARY FROM EMPLOYEES e, JOBS j, DEPARTMENTS d " 
    + "WHERE j.JOB_ID = e.JOB_ID " 
    + " AND d.DEPARTMENT_ID = e.DEPARTMENT_ID" 
    + " AND j.JOB_ID = "+job_id_combo.getSelectedItem().toString()+" AND e.DEPARTMENT_ID = "+dept_id_combo.getSelectedItem().toString() 
    + " AND HIRE_DATE BETWEEN TO_CHAR ('"+date1+"', 'dd/MM/yyyy') AND TO_CHAR('"+date2+"', 'dd/MM/yyyy')" 
    + " AND SALARY > "+salary_field.getText()); 

    while(Rs.next()){ 

    dtm.addRow(new Object[]{Rs.getString("LAST_NAME"), Rs.getString("FIRST_NAME"), 
    Rs.getString("JOB_TITLE"), Rs.getString("DEPARTMENT_NAME"), Rs.getInt("SALARY")}); 
      } 

      Con.close(); 
      St.close(); 
      Rs.close(); 


     }catch(Exception ex){ 

      System.out.println(ex.toString()); 
     } 


    } 

    public void reset_form(){ 

     job_id_combo.setSelectedIndex(0); 
     dept_id_combo.setSelectedIndex(0); 
     salary_field.setText(""); 


    } 

Answer 1

此錯誤表示您的查詢出現問題。錯字，不正確的引號，不正確的大寫。