JDBC处理DML（SXT）

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JDBC处理DML（SXT）

Demo1

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import com.sun.org.apache.xalan.internal.xsltc.runtime.Parameter;
public class TestDML
{
    /**
     * @JDBC处理DML。接收手动输入的参数
     */
    public static void main(String[] args)
    {
        // TODO Auto-generated method stub 
        if (args.length != 4)
        {
            System.out.println("Error,plesase input again!");
            System.exit(-1);
        }
        int userid = 0;
        try
        {
            userid = Integer.parseInt(args[0]);
        } catch (NumberFormatException e)
        {
            System.out.println("Number error");
            System.exit(-1);
        }
        String usernameString = args[1];
        String passwordString  = args[2];
        String userflaString = args[3];
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        try
        {
            Class.forName("com.mysql.jdbc.Driver");
            String url = "jdbc:mysql://localhost:3306/college";
            String user = "root";
            String password = "123456";
            conn = DriverManager.getConnection(url, user, password);
            stmt = conn.createStatement();
            String sql = "insert into user (userId,userName,userPassword,userFlag)values(" + userid+",'"+usernameString+"','"+passwordString+"','" +userflaString+ "')";
            stmt.executeUpdate(sql);
            System.out.println(sql);
            rs = stmt.executeQuery("select * from user where userName='testDML4'");
            while (rs.next())
            {
                System.out.print("username:");
                System.out.println(rs.getString("userName"));
                System.out.print("password:");
                System.out.println(rs.getString("userPassword"));
            }
        } 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.close();
                }
                if (conn != null)
                {
                    conn.close();
                    conn = null;
                }
            } catch (SQLException e)
            {
                // TODO Auto-generated catch block 
                e.printStackTrace();
            }
        }
    }
}

Demo2

import java.sql.*;
/**
 * JDBC处理DML2。无输入参数。
 */
public class TestJDBCDML
{
    /**
     * @param args
     */
    public static void main(String[] args)
    {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        try
        {
            Class.forName("com.mysql.jdbc.Driver");
            
            String url = "jdbc:mysql://localhost:3306/college";
            String user = "root";
            String password = "123456";
            conn = DriverManager.getConnection(url, user, password);
            
            stmt = conn.createStatement();
            
            String sql = "insert into user (userName,userPassword,userFlag)values('testDML2','123','dml')";
            stmt.executeUpdate(sql);
            
            rs = stmt.executeQuery("select * from user where userName='testDML2'");
            
            while(rs.next())
            {
                System.out.print("username:");
                System.out.println(rs.getString("userName"));
                System.out.print("password:");
                System.out.println(rs.getString("userPassword"));
                
            }
        } 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.close();
                }
                
                if (conn != null)
                {
                    conn.close();
                    conn = null;
                }
                
            } catch (SQLException e)
            {
                // TODO Auto-generated catch block 
                e.printStackTrace();
            }
        }
    }
}