线程“main”中的异常java.sql.SQLException：near" s"：语法错误 [英] Exception in thread "main" java.sql.SQLException: near "s": syntax error

问题描述

我编写了一个程序，用一个单词列表填充数据库。问题是，每当我尝试运行代码时，它会抛出线程中的异常主java.sql.SQLException：nears：语法错误。我意识到在这个论坛上已经提出了类似的问题，但是在我的代码中我无法纠正错误。

I wrote a program that populates a database with a list of words. Problem is, it throws up the "Exception in thread "main" java.sql.SQLException: near "s": syntax error" every time I try to run the code. I realize similar questions have been asked on this forum, but in the context of MY code I am unable to rectify the error.

因此我求助于你。

这是代码

import java.io.*;
import java.sql.*;
import java.util.Scanner;

public class db_populate {

    public static void main(String[] args) throws SQLException, IOException,
            ClassNotFoundException {
        Connection c = null;
        Statement stmt = null;
        Scanner in = null;
        String word;
        String wordcat;
        String j, sql;
        int i = 0;

        Class.forName("org.sqlite.JDBC");
        c = DriverManager.getConnection("jdbc:sqlite:dictionary.db");
        c.setAutoCommit(false);
        System.out.println("Opened database successfully");

        stmt = c.createStatement();

        in = new Scanner(new File("wordsEn.txt"));

        while (in.hasNext()) {
            word = in.nextLine();
            i++;
            j = Integer.toString(i);
            wordcat = word.substring(0, 2);
            sql = "INSERT INTO WORDS (ID,CAT,WORD) " + "VALUES(" + j + ",'"
                    + wordcat + "','" + word + "');";
            stmt.executeUpdate(sql);
        }

        stmt.close();
        c.commit();
        c.close();
        in.close();
        System.out.println("Records created successfully");
    }

}

这些是我得到的错误当我运行时。

and these are the errors I get when I run.

Opened database successfully
Exception in thread "main" java.sql.SQLException: near "s": syntax error
    at org.sqlite.core.NativeDB.throwex(NativeDB.java:397)
    at org.sqlite.core.NativeDB._exec(Native Method)
    at org.sqlite.jdbc3.JDBC3Statement.executeUpdate(JDBC3Statement.java:116)
    at db_populate.main(db_populate.java:34)

推荐答案

使用 PreparedStatement 以避免错误输入的问题：

Use PreparedStatement to avoid problems with erroneous input:

PreparedStatement p = c.prepare("INSERT INTO WORDS (ID,CAT,WORD) VALUES(?, ?, ?)");
p.setInt(1, i);
p.setString(2, wordcat);
p.setString(3, word);
p.execute();
//commit results if using InnoDB, etc

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