package basic;

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

public class JDBC {

public void findAll() {

try {

// 獲得數(shù)據(jù)庫驅(qū)動

//由于長時間不寫，驅(qū)動名和URL都忘記了，不知道對不對，你應(yīng)該知道的，自己改一下的哈

String url = "jdbc:oracle:thin:@localhost:1521:XE";

String userName = "system";

String password = "system";

Class.forName("oracle.jdbc.driver.OracleDriver");

// 創(chuàng)建連接

Connection conn = DriverManager.getConnection(url, userName,
password);

// 新建發(fā)送sql語句的對象

Statement st = conn.createStatement();

// 執(zhí)行sql

String sql = "select * from users";

ResultSet rs = st.executeQuery(sql);

// 處理結(jié)果

while(rs.next()){

//這個地方就是給你的封裝類屬性賦值

System.out.println("UserName："+rs.getString(0));

}

// 關(guān)閉連接

rs.close();

st.close();

conn.close();

} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

public void delete(){

try {

//步驟還是那六個步驟，前邊的兩步是一樣的
String url = "jdbc:oracle:thin:@localhost:1521:XE";

String userName = "system";

String password = "system";

Class.forName("oracle.jdbc.driver.OracleDriver");

Connection conn = DriverManager.getConnection(url,userName,password);

//這里的發(fā)送sql語句的對象是PreparedStatement,成為預(yù)處理sql對象，因為按條件刪除是需要不定值的

String sql = "delete from users where id = ?";

PreparedStatement ps = conn.prepareStatement(sql);

ps.setInt(0, 1);

int row = ps.executeUpdate();

if(row!=0){

System.out.println("刪除成功！");

}

// 關(guān)閉連接

rs.close();

st.close();

conn.close();

} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}