这是我的源代码。
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.ResultSet;
public class DBConnect {
public static void main(String[] args) {
try {
String host = "jdbc:derby://localhost:1527/Employee";
String uName = "jayani";
String uPass = "jayani";
Connection con = DriverManager.getConnection(host, uName, uPass);
Statement stmt = con.createStatement();
String sql = "SELECT*FROM WORKERS";
ResultSet rs = stmt.executeQuery(sql);
while (rs.next()) {
int id_col = rs.getInt("ID");
String fname = rs.getString("FIRST_NAME");
String lname = rs.getString("LAST_NAME");
String job = rs.getString("JOB_TITLE");
System.out.println(id_col + "" + fname + "" + lname + "" + job);
}
} catch (SQLException ex) {
System.out.println(ex.getMessage());
}
}
}
这里我得到一个例外" executeQuery方法不能用于更新。" 什么是这个例外,我该如何解决这个问题。 谢谢。
答案 0 :(得分:1)
您需要像这样使用executeQuery
Statement stmt = null;
String query = "select * from <tablename>";
stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(query);