Java中使用JDBC操作数据库简单实例

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

public class MyTest {
  public static void main(String args[]) {
    Connection con = null;
    Statement st = null;
    ResultSet rs = null;
    try {
      // 获得MySQL驱动的实例
      Class.forName("com.mysql.jdbc.Driver").newInstance();
      // 获得连接对象(提供：地址，用户名，密码)
      con = DriverManager.getConnection("jdbc:mysql://127.0.0.1/Weather","root", "root");
    
      if (!con.isClosed())
        System.out.println("Successfully connected ");
      else
        System.out.println("failed connected");
      
      //建立一个Statement，数据库对象
      st = con.createStatement();
      // 运行SQL查询语句
      rs = st.executeQuery("select * from Weather.question_type_1;");
      // 读取结果集
      while (rs.next()) {
        System.out.println("column1:"+rs.getInt(1));
        System.out.println("column2:"+rs.getString(2));
        System.out.println("column3:"+rs.getString(3));
        System.out.println("column4:"+rs.getString(4));
      }
      // 关闭链接
      con.close();
    } catch(Exception e) {
      System.err.println("Exception: " + e.getMessage());
    }
  }
}