第七周JSP增删改查
Posted 郭少锋18840631471
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package ak74;
public class Haoshu {
package ak74; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import com.mysql.jdbc.Driver; public class JDBCUtils { //创建工具类 方便使用 //获取连接 public static Connection getCon() throws Exception{ Class.forName( "com.mysql.jdbc.Driver"); Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/mysql?useSSL=false", "root", "guoshaofeng"); return con; } //关闭数据流 public static void realse(ResultSet rst,Statement st,Connection con){ if(rst!=null){ try { rst.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if(st!=null){ try { st.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if(con!=null){ try { con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }
package ak74;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
public class HaoshuDao {
private List<Haoshu> list;
/**
* @param args
*/
//增加
public boolean insert(Haoshu haoshu){
Statement st=null;
Connection con=null;
try{
con=JDBCUtils.getCon();
st=con.createStatement();
String sql="insert into haoshu "+"values(\'"
+haoshu.getId()+"\',\'"
+haoshu.getName()+"\',\'"
+haoshu.getMvp()+"\',\'"
+haoshu.getChenghao()+"\'"
+")";
int row=st.executeUpdate(sql);
if(row==1){
return true;
}
}catch(Exception e){
throw new RuntimeException(e);
}
finally{
JDBCUtils.realse(null, st, con);
}
return false;
}
//查询所有
public List<Haoshu> FindAllHaoshu(){
Connection con=null;
Statement st=null;
ResultSet rst=null;
try{
con= JDBCUtils.getCon();
st=con.createStatement();
String sql="select*from haoshu;";
rst=st.executeQuery(sql);
List<Haoshu> list=new ArrayList<Haoshu>();
while(rst.next()){
Haoshu haoshu=new Haoshu();
haoshu.setId(rst.getInt("id"));
haoshu.setName(rst.getString("name"));
haoshu.setMvp(rst.getString("mvp"));
haoshu.setChenghao(rst.getString("chenghao"));
list.add(haoshu);
}
return list;
}catch(Exception e){
throw new RuntimeException(e);
}
finally{
JDBCUtils.realse(rst, st, con);
}
}
//根据ID来查询记录
public Haoshu FindHaoshuByid(int id){
Connection con=null;
PreparedStatement st=null;
ResultSet rst=null;
try{
con= JDBCUtils.getCon();
String sql="select*from haoshu where id=?;";
st=con.prepareStatement(sql);
st.setInt(1, id);
rst=st.executeQuery();
if(rst.next()){
Haoshu haoshu=new Haoshu();
haoshu.setId(rst.getInt("id"));
haoshu.setName(rst.getString("name"));
haoshu.setMvp(rst.getString("mvp"));
haoshu.setChenghao(rst.getString("chenghao"));
return haoshu;
}
}catch(Exception e){
throw new RuntimeException(e);
}
finally{
JDBCUtils.realse(rst, st, con);
}
return null;
}
//根据id修改name和mvp
public boolean Update(Haoshu haoshu){
PreparedStatement st=null;
Connection con=null;
try{
con=JDBCUtils.getCon();
String sql="update haoshu set name=?,mvp=? where id=?";
st=con.prepareStatement(sql);
st.setString(1, haoshu.getName());
st.setString(2, haoshu.getMvp());
st.setInt(3, haoshu.getId());
int row=st.executeUpdate();
if(row==1){
return true;
}
}catch(Exception e){
throw new RuntimeException(e);
}
finally{
JDBCUtils.realse(null, st, con);
}
return false;
}
//根据id删除
public boolean Delete(int id){
PreparedStatement st=null;
Connection con=null;
try{
con=JDBCUtils.getCon();
String sql="delete from haoshu where id=?";
st=con.prepareStatement(sql);
st.setInt(1, id);
int row=st.executeUpdate();
if(row==1){
return true;
}
}catch(Exception e){
throw new RuntimeException(e);
}
finally{
JDBCUtils.realse(null, st, con);
}
return false;
}
}
package ak74;
public class JdbcInsertText {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
HaoshuDao dao=new HaoshuDao();
Haoshu haoshu=new Haoshu();
haoshu.setId(6);
haoshu.setName("兰亭集序");
haoshu.setMvp("王小姐");
haoshu.setChenghao("GXJ");
dao.insert(haoshu) ;
}
}
package ak74;
public class FindHaoshuByid {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
HaoshuDao dao=new HaoshuDao();
Haoshu h= dao.FindHaoshuByid(6);
System.out.println(h.getName());
}
}
package ak74;
public class Update {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
HaoshuDao dao=new HaoshuDao();
Haoshu hh=new Haoshu();
hh.setId(6);
hh.setName("徐凤年");
hh.setMvp("bl");
boolean b=dao.Update(hh);
System.out.println(b);
}
}
package ak74;
public class Delete {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
HaoshuDao dao=new HaoshuDao();
boolean bb=dao.Delete(2);
System.out.println(bb);
}
}
/** * @param args */ //一，创建JavaBean用来封装用户数据 private int id; private String name; private String mvp; private String chenghao; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getMvp() { return mvp; } public void setMvp(String mvp) { this.mvp = mvp; } public String getChenghao() { return chenghao; } public void setChenghao(String chenghao) { this.chenghao = chenghao; } public static void main(String[] args) { // TODO Auto-generated method stub } }
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