JDBC的配置及使用入門

JDBC本質上一套規范接口，建立java和數據庫的連接，從而對數據庫進行CRUD，下面以mysql數據庫為例，如圖：

JDBC的代碼實現：

package JdbcUtil;

;

/**
 * @author o_0sky
 * @date 2019/2/18 1:57
 */
public class Standard {
    //獲取連接
    Connection con = null;
    //創建statement對象
    Statement statement = null;
    ResultSet resultSet = null;
    //注冊mysql驅動
     try{Class.forName("com.mysql.jdbc.Driver");
    //配置數據庫參數
    String url = "jdbc:mysql://localhost:3306/test";
    String username = "root";
    String password = "root";
    con=DriverManager.getConnection(url,username,password);
    statement=con.createStatement();
    //發送並執行sql
    String sql = "select * from tb_user";
    resultSet=statement.executeQuery(sql);
    while(resultSet.next())
    {
        String name = resultSet.getString("name");
        String age = resultSet.getString("age");
        System.out.println(name);
        System.out.println(age);
    }}
    catch(Exception e){
         e.getStackTrace();
    }
    //釋放資源
    finally{
         if (resultSet!=null){
             try {
                 resultSet.close();
             } catch (Exception e1) {
                 e1.printStackTrace();
             }
         }
         if (statement!=null){
             try {
                 statement.close();
             } catch (Exception e1) {
                 e1.printStackTrace();
             }
         }
         if (con!=null){
             try {
                 con.close();
             } catch (Exception e1) {
                 e1.printStackTrace();
             }
         }
    }


}