package wmk;
import java.sql.ResultSet;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.DriverManager;
import java.sql.SQLException;
public class JbcdTestAll2 {
//static final 变量应该用大写
// Class.forName("oracle.jdbc.driver.OracleDriver");
//NAME = "jdbc:oracle:" + "thin:@127.0.0.1:1521:XE";// 127.0.0.1是本机地址，XE是精简版Oracle的默认数据库名
public static final String URL = "jdbc:mysql://localhost:3306/community";
public static final String NAME = "com.mysql.jdbc.Driver";
public static final String USER = "wmk";
public static final String PASSWORD = "admin";
Connection conn = null;
PreparedStatement statement = null;
ResultSet res = null;
String a = "";
String b = "";
String c = "";
public JbcdTestAll2(String sql) throws SQLException {
try {
//注册驱动
Class.forName(NAME);
//获取链接
conn = DriverManager.getConnection(URL, USER, PASSWORD);
//创建查询
statement = conn.prepareStatement(sql);
//使用resultset获取查询结果 executeUpdate(sql) 返回影响行数，用于插入 修改 删除
res = statement.executeQuery();
//遍历结果集
while (res.next()) {
a = res.getString(1);
b = res.getString(2);
c = res.getString(3);
System.out.println(a+" - "+b+" - "+c);
}
//调用关闭方法，释放资源
close();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
//封装关闭为一个方法
public void close(){
try {
if (conn!=null) {
conn.close();
}
if (statement!=null) {
statement.close();
}
if (res!=null) {
res.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws SQLException {
JbcdTestAll2 a = new JbcdTestAll2("select * from news");
}
}