Java關閉數據庫資源的兩種方式

第一種:

_______________________________________________________________________________

package jdbc;

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

/**
 * 關閉資源的常用操作一
 * @author Joey
 */
public class JDBC_Test1 {

    private static String url = "jdbc:mysql://127.0.0.1:3306/study?characterEncoding=UTF-8";
    private static String userName = "root";
    private static String passWord = "joey";

    public static void main(String[] args) {

        Connection connection=null;
        Statement statement=null;
        String sql=null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection(url, userName, passWord);
            statement = connection.createStatement();
            sql = "insert into employee values(null," + "'Jack" + "'" + ",'[email protected]'" + ",'5000')";
            statement.execute(sql);
            System.out.println("OK");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 關閉資源
            if (statement!=null) {
                try {
                    statement.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            if (connection!=null) {
                try {
                    statement.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

第二種:

_______________________________________________________________________________

package jdbc;

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

/**
 * 關閉資源的常用操作二
 * try-with-resource
 * @author Joey
 */
public class JDBC_Test2 {

    private static String url = "jdbc:mysql://127.0.0.1:3306/study?characterEncoding=UTF-8";
    private static String userName = "root";
    private static String passWord = "joey";

    public static void main(String[] args) {

        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        // 將資源聲明在try()中,當語句結束,資源將被關閉
        try (Connection connection = DriverManager.getConnection(url, userName, passWord);
                Statement statement = connection.createStatement();) {
            String sql = "insert into employee values(null," + "'Tom" + "'" + ",'[email protected]'" + ",'5000')";
            statement.execute(sql);
            System.out.println("OK");
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

完~