zuixinzhixundaoimpl.java~3~

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package liangjuyan.dao;

import liangjuyan.zuixinzhixun;
import liangjuyan.conndb;
import java.util.List;
import java.util.ArrayList;
import java.sql.ResultSet;
import java.sql.*;
import liangjuyan.chStr;

public class zuixinzhixundaoimpl
    implements zuixinzhixundao{
  private conndb conn = new conndb();
  //执行插入操作
  public int insert(zuixinzhixun z) {
    chStr chStr = new chStr();
    int ret = -1;
    try {
      String sql = "Insert into zuixinzhixun(Title,Detail,Htype) values('" +
          chStr.chStr(z.getTitle()) + "','" + chStr.chStr(z.getDetail()) +
          "','" + z.getHtype()+"')";
       ret = conn.executeUpdate(sql);
    }
    catch (Exception e) {
      ret = 0;
    }
    conn.close();
    return ret;
  }

  //执行修改操作
  public int update(zuixinzhixun z) {
    int ret = -1;
    chStr chStr = new chStr();
    try {
      String sql = "update zuixinzhixun set title='" +
          chStr.chStr(z.getTitle()) +
          "',detail='" + chStr.chStr(z.getDetail()) + "',htype='" +
        z.getHtype()+ "' where id=" + z.getId();
      ret = conn.executeUpdate(sql);
    }
    catch (Exception e) {
      ret = 0;
    }
    conn.close();
    return ret;
  }

  //执行删除操作
  public int delete(zuixinzhixun z) {
     int ret=-1;
     try{
       String sql="Delete from zuixinzhixun where id="+z.getId();
       ret=conn.executeUpdate(sql);
     }catch(Exception e){
       ret=0;
     }
     conn.close();
     return ret;

   }


  //执行查询操作
  public List select() {
  zuixinzhixun form = null;
    List list = new ArrayList();
    String sql = "select * from zuixinzhixun";
    ResultSet rs = conn.executeQuery(sql);
    try {
      while (rs.next()) {
        form = new zuixinzhixun();
        form.setId(Integer.valueOf(rs.getString(1)));

        list.add(form);
      }
    }
    catch (SQLException ex) {
    }
    conn.close();
    return list;
  }

  public zuixinzhixun select1() {
    return null;
  }

}