Java通过JDBC操纵mysql的例子

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public final class JDBCUtils {
private JDBCUtils() {
}
private static String url = "jdbc:mysql://localhost:3306/forum";
private static String user = "root";
private static String password = "root";
static {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
throw new ExceptionInInitializerError(e);
}
}
public static Connection getConnection() throws SQLException {
return DriverManager.getConnection(url, user, password);
}
public static void free(ResultSet rs, Statement st, Connection conn) {
try {
if (rs != null)
rs.close();
} catch (SQLException e) {
} finally {
try {
if (st != null)
st.close();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
JDBCUtilsTest();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void JDBCUtilsTest() throws Exception {
Connection conn = null;
Statement st = null;
ResultSet rs = null;
try {
conn = JDBCUtils.getConnection();
st = conn.createStatement();
rs = st.executeQuery("select * from user");
while (rs.next()) {
System.out.println(rs.getObject(1) + "/t" + rs.getObject(2));
}
} finally {
JDBCUtils.free(rs, st, conn);
}
}
}