JAVA連接mysql數據庫常用功能框架。

import java.sql.*;

/**
 * Created by meng on 2015/7/11.
 */

class myConnection{
    private String dbDriver="com.mysql.jdbc.Driver";
    private String dbUrl="jdbc:mysql://127.0.0.1:3306/test";//根據實際情況變化
    private String dbUser="root";
    private String dbPass="root";
    public java.sql.Connection getConn()
    {
        java.sql.Connection conn=null;
        try
        {
            Class.forName(dbDriver);
        }
        catch (ClassNotFoundException e)
        {
            e.printStackTrace();
        }
        try
        {
            conn = DriverManager.getConnection(dbUrl, dbUser, dbPass);//注意是三個參數
            System.out.print("mysqlConnection.");
        }
        catch (SQLException e)
        {
            e.printStackTrace();
        }
        return conn;
    }

    public int insert()
    {
        int i=0;
        String sql="insert into (表名)(列名1,列明2) values(?,?)";
        Connection cnn=getConn();

        try{
            PreparedStatement preStmt =cnn.prepareStement(sql);
            preStmt.setString(1,值);
            preStmt.setString(2,值);//或者：preStmt.setInt(1,值);
            i=preStmt.executeUpdate();
        }
        catch (SQLException e)
        {
            e.printStackTrace();
        }
        return i;//返回影響的行數，1爲執行成功
    }
    public int update
    {
        int i=0;
        String sql="update (表名) set  (列名1)=?,列明2=? where (列名)=？";//注意要有where條件
        Connection cnn=getConn();


        try{
            PreparedStatement preStmt =cnn.prepareStatement(sql);
            preStmt.setString(1,(值));
            preStmt.setString(2,(值));//或者：preStmt.setInt(1,值);
            preStmt.setInt(3,(值));
            i=preStmt.executeUpdate();
        }
        catch (SQLException e)
        {
            e.printStackTrace();
        }
        return i;//返回影響的行數，1爲執行成功
    }

    public String select
    {
        String sql = "select * from (表名) where (列名)=(值)";
        Connection cnn = getConn();//此處爲通過自己寫的方法getConn()獲得連接
        try
        {
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery(sql);

            if(rs.next())
            {
                int m1 = rs.getInt(1);//或者爲rs.getString(1)，根據數據庫中列的值類型確定，參數爲第一列
                String m2 = rs.getString(2);
            }
            //可以將查找到的值寫入類，然後返回相應的對象
        }
        catch (SQLException e)
        {
            e.printStackTrace();
        }
        return (相應的值的變量);
    }

    public int delete()
    {
        String sql = "delete from (表名) where (列名)=(值)";
        int i=0;
        Connection conn = getConn();//此處爲通過自己寫的方法getConn()獲得連接
        try
        {
            Statement stmt = conn.createStatement();
            i = stmt.executeUpdate(sql);
        }
        catch (SQLException e)
        {
            e.printStackTrace();
        }
        return i;//如果返回的是1，則執行成功;
    }
}
public class main {

    public static void main(String[] args){
        myConnection con1 = new myConnection();
        con1.getConn();
    }
}