传统的JDBC连接数据库操作

package cn.mike.javase.test;

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

public class JDBC_Connection {

public static void main(String[] args) {

Connection conn = null;// connection

PreparedStatement preState = null;// prepared statement

ResultSet resultSet = null;// resultset

try {
// load driver
Class.forName("com.mysql.jdbc.Driver");

// get connection
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/ibatis_test", "root", "3713");

/* sql statement */
String querySql = "SELECT * FROM USERS WHERE USERNAME = ?";

// prepare statement
preState = conn.prepareStatement(querySql);

// set parameter
preState.setString(1, "michael");

// execute query
resultSet = preState.executeQuery();

// iterate result set
while (resultSet.next()) {
System.out.println(resultSet.getString("id") + "\t" + resultSet.getString("username") + "\t" + resultSet.getString("password"));
}

} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}

// close streams seperately
try {
if (null != resultSet) {
resultSet.close();
}
if (null != preState) {
preState.close();
}
if (null != conn) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}

}

}