了解神秘的Oracle JDBC错误 - ORA-00911:无效字符

Question

我正在制作Java 1.6-JDBC-Oracle 11代码.我创建了一个名为employee的表,其中包含id,name和age.我收到错误 - ORA-00911:无效字符.我怎样才能解决这个问题 ？

这是我的代码 -

import java.sql.*;
import java.util.Properties;
import java.io.IOException;
import java.io.FileInputStream;

public class HelloOracle {

    static String query =
        "SELECT emp_id, emp_name, emp_age " +
        "FROM employee;";

    public static void main(String[] args) {
        String username = "";
        String password = "";
        Properties prop = new Properties();
        try {
            FileInputStream fis = new FileInputStream("Login.properties");
            prop.load(fis);
        } catch (IOException ex) {
            ex.printStackTrace();
        }

        username = prop.getProperty("username").trim();
        password = prop.getProperty("password").trim();

        try {
            Connection con = DriverManager.getConnection("jdbc:oracle:thin:@//localhost:1521/xe", username, password);

            Statement stmt = con.createStatement();

            ResultSet rs = stmt.executeQuery(query);

            while (rs.next()) {
                System.out.print(rs.getString("emp_id"));
                System.out.print("  ,  ");
                System.out.print(rs.getString("emp_name"));
                System.out.print("  ,  ");
                System.out.print(rs.getString("emp_age"));
                System.out.println();
            }
        } catch (SQLException e) {
            System.out.println("Exception: " + e);
        }

    }

}

不幸的是,oracle错误消息不像mysql或mssql那样提供信息,我无法轻易解决它们.我也无法看到哪行代码导致异常.

Answer 1

尝试从SQL语句的末尾删除分号.

即

static String query = "SELECT emp_id, emp_name, emp_age " +
    "FROM employee"; // no trailing ";" in the SQL