import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.Statement;
public class JdbcDemo {
public static void main(String[] args) throws SQLException, ClassNotFoundException{
Statement statement = null;//传递sql语句
//1.加载数据库驱动
Class.forName("com.mysql.jdbc.Driver");
//2.获取数据库的地址，用户名，密码
String url = "jdbc:mysql://localhost:3306/t1";
String username = "root";
String password = "？？？？？？？？";//填写数据库密码
//3.建立一个与数据库的连接
Connection connection = null;//连接对象
connection = (Connection) DriverManager.getConnection(url, username, password);
statement = (Statement) connection.createStatement();
addData(statement);//增加数据
// selectData(statement,result);//查询数据
updateData(statement);//修改数据
dropData(statement);//删除数据
//关闭连接
connection.close();
statement.close();
}
/**
* 查询数据
* @throws SQLException
*/
public static void selectData(Statement statement) throws SQLException{
String string = "select * from phone";
//4.执行语句
ResultSet result = statement.executeQuery(string);
System.out.println("查询最新结果为：");
while(result.next()){
String id1 = result.getString(1);
String s1 = result.getString(2);
String s2 = result.getString(3);
String s3 = result.getString(4);
String s4 = result.getString(5);
System.out.println("id = "+id1+" name = "+s1+" 价格= "+s2+" 上市时间= "+s3+" 公司= "+s4);
System.out.println("\t");
}
}
/**
* 删除数据
* @throws SQLException
*/
public static void dropData(Statement statement) throws SQLException{
String string = "delete ignore from phone where id=2";
//执行语句
@SuppressWarnings("unused")
Boolean result = statement.execute(string);
System.out.println("删除指定数据后的表为：");
selectData(statement);
}
/**
* 修改数据
* @throws SQLException
*/
public static void updateData(Statement statement) throws SQLException{
String string = "update ignore phone set name = '未知' where id=1";
//执行语句
@SuppressWarnings("unused")
Boolean result = statement.execute(string);
System.out.println("修改指定数据后的表为：");
selectData(statement);
}
/**
* 增加数据
* @throws SQLException
*/
public static void addData(Statement statement) throws SQLException{
String string = "insert ignore into phone(id,name,price,上市时间,company) values(8,'诺基亚',3600,'2012-5-9','诺基亚')";
//执行语句
@SuppressWarnings("unused")
Boolean result = statement.execute(string);
System.out.println("增加指定数据后的表为：");
selectData(statement);
}
}
分四步：
1.加载数据库驱动
Class.forName("com.jdbc.mysql.Driver";
2.获取数据库url，用户名，密码
3.建立数据库连接
Connection conn = DriverManager.getConnection(url,username,password);
Statement statement = coon.createStatement();
4.执行语句
ResultSet res = statement.executeQuery("sql语句")//适用于查询
或者 Boolean res = statement.execute("sql语句");//适用于增删改
后使用res.next()进行迭代输出；
5.关闭连接
