巧用ＪＤＢＣ实现对MySQL的“增删改查”

 

用ＪＤＢＣ实现对MySQL的“增删改查”：

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import com.bean.NoticeBean;

public class JDBCTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Connection conn=null;
        Statement stmt=null;
        ResultSet rs=null;
        
    
            try {
                String driverName="com.mysql.jdbc.Driver";
                Class.forName(driverName);
                String url="jdbc:mysql://localhost:3306/java?

useUnicode=true&characterEncoding=gb2312";

                conn=DriverManager.getConnection(url,"root","root");
                System.out.println("连接MySql成功!!!");
                stmt=null;
                rs=null;
                String strSql=null;
                NoticeBean bean=null;
                String title=null;
                String content=null;
                  try {
                    title="标题";
                      content="内容";
strSql="INSERT INTO notice(title,content) VALUES('"+title+"','"+content+"')";

                      stmt=conn.createStatement();
                     stmt.executeUpdate(strSql);
                      System.out.println("插入语句执行成功:"+strSql);
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    System.out.println("插入失败");
                }
                
                strSql="select * from notice";
stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, 
ResultSet.CONCUR_READ_ONLY);
                rs=stmt.executeQuery(strSql);
                if(rs.next()){
                    int id=rs.getInt("id");
                    title =rs.getString("title");
                    content=rs.getString("content");
                    if(rs.next()){
                        bean=new NoticeBean(id,title,content);
                    }
System.out.println("notice第一行数据是"+bean.getId()+" "+bean.getTitle()

+" "+bean.getContent());
                }
                
                try {
                    strSql="delete from notice";
                    stmt=conn.createStatement();
                    stmt.executeUpdate(strSql);
                    System.out.println("删除完成");
                } catch (RuntimeException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    System.out.println("删除失败");
                }
                
            } catch (ClassNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }finally{
                try {
                    if(rs!=null){
                        rs.close();
                        rs=null;
                    }
                    if(stmt!=null){
                        stmt.close();
                        stmt=null;
                    }
                    if(conn!=null){
                        conn.close();
                        conn=null;
                    }
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            
        
        
    }

}

（责任编辑：卢兆林）