【java源碼】jdbc實現增查刪改

package Teacher;


import java.sql.*;


public class TeacherDao {
//////主函數/主函數/主函數/主函數/主函數/////////////////////////////////////////////////////////////////////////////////////////////
public static void main(String[] args){
TeacherDao t=new TeacherDao();
t.Insert();
t.Delect();
t.Update();
t.Selsct();
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//插入數據
private void Insert() {
Connection conn=null;
PreparedStatement ps=null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test?useUnique=true&characterEncoding=utf8","root","123456");
ps=conn.prepareStatement("insert into teacher(tid,tname,weight,birthday)values(?,?,?,?)");//創建會話
ps.setString(1,"1007");
ps.setString(2, "李陽紅");
ps.setDouble(3, 65);
ps.setString(4, "1973-01-23");
ps.executeUpdate();
System.out.println("數據插入成功！");
}catch(Exception e){
e.printStackTrace();
}finally{
try{
if(ps!=null)
ps.close();
if(conn!=null)
conn.close();

}catch(Exception e){
e.printStackTrace();
}

}
}


/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//修改數據
private void Update() {
Connection conn=null;
PreparedStatement ps=null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test?useUnique=true&characterEncoding=utf8","root","123456");
ps=conn.prepareStatement("update teacher set tname=?,weight=?, birthday=?where tid=?");//創建會話
ps.setString(1,"張氏");
ps.setDouble(2, 54);
ps.setString(3,"1900-12-12 ");
ps.setString(4, "1004");
ps.executeUpdate();
System.out.println("數據修改成功！");


} catch (Exception e) {
e.printStackTrace();
}finally{
try{
if(ps!=null)
ps.close();
if(conn!=null)
conn.close();

}catch(Exception e){
e.printStackTrace();
}
}

}


//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//刪除數據
private void Delect() {
Connection conn=null;
PreparedStatement ps=null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test?useUnique=true&characterEncoding=utf8","root","123456");
ps=conn.prepareStatement("delete from teacher where tid=?");
ps.setString(1, "1001");
ps.executeUpdate();
System.out.println("數據刪除成功！");
}catch(Exception e){
e.printStackTrace();
}finally{
try{
if(ps!=null)
ps.close();
if(conn!=null)
conn.close();
}catch (Exception e) {
e.printStackTrace();
}
}
}


///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//查詢數據
public void Selsct(){
Connection conn=null;
PreparedStatement rs=null;
ResultSet r = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test?useUnique=true&characterEncoding=utf8","root","123456");
rs=conn.prepareStatement("select * from teacher where tid=?");
rs.setString(1, "1002");
r=rs.executeQuery();
while(r.next()){
System.out.println(r.getObject(1)+"  "+r.getObject(2)+" "+r.getObject(3)+"  "+r.getObject(4));
}
}catch (Exception e) {
e.printStackTrace();
}finally{
try{
if(r!=null)
r.close();
if(rs!=null)
rs.close();
if(conn!=null)
conn.close();
}catch (Exception e) {
e.printStackTrace();
}
}
}
}