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![SQL UPDATE
Table)
Record
1 Where
Update Database (MySQL)
Code
UPDATE [Table-Name] SET
Column1='Value1',Column2='Value2',... WHERE clause
UPDATE SET
1=’ 1′, 2=’ 2′
WHERE ’ ’
UPDATE tb_department SET dep_name=’testedit’,
dep_sname=’ ’ WHEREdep_id =’ 2′](https://image.slidesharecdn.com/updatedelete-130814043054-phpapp01/85/Update-delete-1-320.jpg)
![SQL UPDATE
Table)
Record
Record Where
delete Database (MySQL)
Code
DELETE FROM [Table-Name] WHERE clause
DELETE
DELETE FROM TABLE_NAME =
WHERE =](https://image.slidesharecdn.com/updatedelete-130814043054-phpapp01/85/Update-delete-2-320.jpg)
Uploaded byBongza Naruk
Update&delete
This document provides code examples for performing CRUD (create, read, update, delete) operations in a MySQL database using JSP and Java servlets. It includes SQL code examples for updating, deleting records from a table. It also includes Java code examples for a MemberDAO class with methods to get, update, delete members, and servlet classes to handle edit, update, and delete requests.
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Update&delete
- 1. SQL UPDATE Table) Record 1 Where UpdateDatabase (MySQL) Code UPDATE [Table-Name] SET Column1='Value1',Column2='Value2',... WHERE clause UPDATE SET 1=’ 1′, 2=’ 2′ WHERE ’ ’ UPDATE tb_department SET dep_name=’testedit’, dep_sname=’ ’ WHEREdep_id =’ 2′
- 2. SQL UPDATE Table) Record Record Where deleteDatabase (MySQL) Code DELETE FROM [Table-Name] WHERE clause DELETE DELETE FROM TABLE_NAME = WHERE =
- 3. DELETE FROM membersbook WHEREmember_id=”+ID+””; JSP edit 1. WebContent--> New --> JSP file edit.jsp
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- 5. EditServlet.java 1. Package com.controller-->New -- > Servlet EditServlet 2. EditServlet. java Method doPost Method doget
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- 8. MemberDAO.java 1. MemberDAO.java Method Method Method MemberDAO.java 2.Method MemberDAO.java
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- 10. Code Class edit <body> <%MembersBean mem = (MembersBean)request.getAttribute("MemberData"); %> <form action="UpdateServlet" method="post"> <input type="hidden" value="<%=mem.getMember_id()%>"name ="memberID"/> <table> <tr>
- 11. <td align="right"> </td> <tdalign="center" bgcolor="green"><input type="text" name="name" value ="<%=mem.getMember_firstname()%>"></td> </tr> <tr> <td align="right"> </td> <td align="center" bgcolor="green"><input type="text" name="lastname" value ="<%=mem.getMember_lastname()%>"></td> </tr> <tr> <td align="right"> </td> <td align="center" bgcolor="green"><textarea rows="5" cols="10" name="address" ><%=mem.getMember_address()%></textarea></td > </tr> <tr> <td align="right"> </td>
- 12. <td align="center" bgcolor="green"><inputtype="text" name="phone" value ="<%=mem.getMember_number()%>"></td> </tr> <tr> <td colspan="2" align="center"><input value=" type="submit"><input value=" type="reset"></td> </tr> </table> </form> </body> Code Class EditServlet protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doPost(request, response); } /**
- 13. * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponseresponse) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String memberID = request.getParameter("memberID"); MemberDAO md = new MemberDAO(); String page = "edit.jsp"; request.setAttribute("MemberData",md.getMem ber(memberID)); RequestDispatcher dispatcher = request.getRequestDispatcher(page); if(dispatcher != null){ dispatcher.forward(request, response); //forward request, response
- 14. System.out.println("send complete"); // sendcomplete } // } } Code Class UpdateServlet protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub request.setCharacterEncoding("UTF-8"); String id = request.getParameter("memberID"); String fname = request.getParameter("name") ; String lname = request.getParameter("lastname") ; String addr = request.getParameter("address") ; String tel = request.getParameter("phone"); String page = "Search.jsp"; // Profile.jsp
- 15. MemberDAO md =new MemberDAO(); MembersBean mem = new MembersBean(); mem.setMember_id(Integer.parseInt(id)); mem.setMember_firstname(fname); mem.setMember_lastname(lname); mem.setMember_address(addr); mem.setMember_number(tel); md.UpdateMembers(mem); RequestDispatcher dispatcher = request.getRequestDispatcher(page); if(dispatcher != null){ dispatcher.forward(request, response); //forward request, response System.out.println("send complete"); // send complete } // } Code Class DeleteServet
- 16. protected void doGet(HttpServletRequestrequest, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doPost(request, response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String id = request.getParameter("memberID"); String page = "Search.jsp"; // Search.jsp MemberDAO md = new MemberDAO(); MembersBean mem = new MembersBean(); mem.setMember_id(Integer.parseInt(id));
- 17. md.DeleteMembers(id); RequestDispatcher dispatcher = request.getRequestDispatcher(page); if(dispatcher!= null){ dispatcher.forward(request, response); //forward request, response System.out.println("send complete"); // send complete } // } Code Class MemberDAO public static MembersBean getMember(String ID){ MembersBean mem = new MembersBean(); String sql = "SELECT * FROM membersbook WHERE member_id="+ID+""; //SELECT FROM members try {
- 18. dbc.createConnection(); // stmt =dbc.getStatement(); // getStatement() stmt rs = stmt.executeQuery(sql); // rs while (rs.next()) { mem = new MembersBean(); mem.setMember_id(rs.getInt("member_id")); mem.setMember_username(rs.getString("member_u sername")); mem.setMember_password(rs.getString("member_pa ssword")); mem.setMember_firstname(rs.getString("member_fir stname")); mem.setMember_lastname(rs.getString("member_las tname"));
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- 20. return mem; } ------------------------------- MethodUpdate---------- ---------------- public static boolean UpdateMembers(MembersBean mem){ String sql = "UPDATE membersbook SET member_firstname='" +mem.getMember_firstname()+"',member_lastname= '" +mem.getMember_lastname()+"',member_address='" +mem.getMember_address()+"',member_number='" +mem.getMember_number()+"'WHERE member_id=" +mem.getMember_id(); try { dbc.createConnection(); //
- 21. stmt = dbc.getStatement(); //getStatement() stmt stmt.executeUpdate(sql); // rs } catch (Exception e) { e.printStackTrace(); // error } return true; } ------------------------------- Method Delete----------- --------------- public static boolean DeleteMembers(String ID){ String sql = "DELETE FROM membersbook WHERE member_id="+ID+""; try{ dbc.createConnection(); // stmt = dbc.getStatement(); // getStatement() stmt
- 22. stmt.executeUpdate(sql); // rs } catch(Exception e) { e.printStackTrace(); // error } return true; } -http://www.code- father.com/%E0%B8%84%E0%B8%B3%E0%B8%AA%E0%B8%B1%E0%B9%88%E0%B 8%87-sql-Select-from-Where-,Like-,Order-By- %E0%B8%97%E0%B8%B5%E0%B9%88%E0%B8%88%E0%B8%B3%E0%B9%80%E0%B 8%9B%E0%B9%87%E0%B8%99%E0%B8%95%E0%B9%89%E0%B8%AD%E0%B8%87% E0%B9%83%E0%B8%8A%E0%B9%89%E0%B9%81%E0%B8%A5%E0%B8%B0%E0%B8 %95%E0%B9%89%E0%B8%AD%E0%B8%87%E0%B9%83%E0%B8%8A%E0%B9%89%E 0%B8%9A%E0%B9%88%E0%B8%AD%E0%B8%A2-%E0%B9%86_00022.html -http://www.select2web.com/sql/sql-delete-commmand.html -http://www.thaicreate.com/tutorial/sql-delete.html
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