java每日一練------資料庫連線
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class DbOperate {
public static void main(String []args) {
db_operate();
}
public static void db_operate() {
Connection con;
String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/db_table";
String user = "root";
String password = "123456";
try {
Class.forName(driver);
con = DriverManager.getConnection(url, user, password);
if(!con.isClosed()) {
Statement statement = con.createStatement();
String sql = "select * from test_table";
ResultSet rs = statement.executeQuery(sql);
String data = "";
while(rs.next()) {
data = rs.getString("data");
System.out.println("得到data: "+ data);
}
rs.close();
}
con.close();
} catch(Exception e) {
e.printStackTrace();
}
}
}