JDBC連接步驟

JDBC連接數據庫的快速入門

快速入門步驟：

1.導入包
2.註冊驅動
3.創建連接對象 Connection
4.定義sql
5.創建執行sql對象 Statement
6.執行sql
7.處理結果
8.釋放資源

package Test;

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

public class JdbcDemo {

    public static void main(String[] args) {
        //提升作用域
        Connection conn = null;
        Statement stmt = null;
        try {
            //1.導入包
            //2.註冊驅動
            Class.forName("com.mysql.jdbc.Driver");
            //3.創建連接對象 Connection
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/庫名","數據庫用戶名","數據庫密碼");
            //4.定義sql
            String sql = "insert into user values(null,'小呂',1515)";
            //5.創建執行sql對象 Statement
            stmt = conn.createStatement();
            //6.執行sql
            int count = stmt.executeUpdate(sql);
            //7.處理結果
            System.out.println(count);
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            //8.釋放資源
            try {
                //防止空指針異常
                if(stmt != null){
                    stmt.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
            //兩個都要釋放掉
            try {
                if(conn != null){
                    conn.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

實現的效果