Question

我正在尝试使用SQLite作为我的存储空间。我已经使用nuget和using语句添加了引用dll。

我有

private void SetConnection()
{
            sql_con = new SQLiteConnection
                ("Data Source=c:\\Dev\\MYApp.sqlite;Version=3;New=False;Compress=True;");
}

private void ExecuteQuery(string txtQuery)
{
            SetConnection();
            sql_con.Open();
            sql_cmd = sql_con.CreateCommand();
            sql_cmd.CommandText = txtQuery;
            sql_cmd.ExecuteNonQuery();
            sql_con.Close(); 
}

我正在发送像这样的查询文本

public void Create(Book book)
{
            string txtSqlQuery  = "INSERT INTO Book (Id, Title, Language, PublicationDate, Publisher, Edition, OfficialUrl, Description, EBookFormat) ";
            txtSqlQuery += string.Format("VALUES (@{0},@{1},@{2},@{3},@{4},@{5},@{6},@{7},{8})", 
                        book.Id, book.Title, book.Language, book.PublicationDate, book.Publisher, book.Edition, book.OfficialUrl, book.Description, book.EBookFormat);
                   try
                   {
                       ExecuteQuery(txtSqlQuery);
                   }
                   catch (Exception ex )
                   {
                       throw new Exception(ex.Message);
                   }    
}

我的数据库已正确创建并传递了具有有效数据的书籍实例。但是在这行代码上执行查询总是抛出异常：

sql_cmd.ExecuteNonQuery();

我显然在这里做错了但我看不到。

更新：抛出的异常消息是

SQL逻辑错误或缺少数据库

无法识别的令牌：“22cf”

此22cf是传递book.Id guid字符串的一部分。

Answer 1

Don't EVER insert your data in your statement!

使用预准备语句和绑定参数：

public void Create(Book book) {
    SQLiteCommand insertSQL = new SQLiteCommand("INSERT INTO Book (Id, Title, Language, PublicationDate, Publisher, Edition, OfficialUrl, Description, EBookFormat) VALUES (?,?,?,?,?,?,?,?,?)", sql_con);
    insertSQL.Parameters.Add(book.Id);
    insertSQL.Parameters.Add(book.Title);
    insertSQL.Parameters.Add(book.Language);
    insertSQL.Parameters.Add(book.PublicationDate);
    insertSQL.Parameters.Add(book.Publisher);
    insertSQL.Parameters.Add(book.Edition);
    insertSQL.Parameters.Add(book.OfficialUrl);
    insertSQL.Parameters.Add(book.Description);
    insertSQL.Parameters.Add(book.EBookFormat);
    try {
        insertSQL.ExecuteNonQuery();
    }
    catch (Exception ex) {
        throw new Exception(ex.Message);
    }    
}

Answer 2

要将记录插入到SqliteDB中：

using System.Data.SQLite;

    private void btnInsert_Click(object sender, RoutedEventArgs e)
    {
     string connection = @"Data Source=C:\Folder\SampleDB.db;Version=3;New=False;Compress=True;";
     SQLiteConnection sqlite_conn = new SQLiteConnection(connection);
     string stringQuery ="INSERT INTO _StudyInfo"+"(Param,Val)"+"Values('Name','" + snbox.Text + "')";//insert the studyinfo into Db
     sqlite_conn.Open();//Open the SqliteConnection
     var SqliteCmd = new SQLiteCommand();//Initialize the SqliteCommand
     SqliteCmd = sqlite_conn.CreateCommand();//Create the SqliteCommand
     SqliteCmd.CommandText = stringQuery;//Assigning the query to CommandText
     SqliteCmd.ExecuteNonQuery();//Execute the SqliteCommand
     sqlite_conn.Close();//Close the SqliteConnection
    }

Answer 3

在将字符串发送到INSERT语句时应该使用（'） VALUES（@ {0}，'@ {1}'，'@ {2}'，'@ {3}'，'@ {4}'，'@ {5}'，'@ {6}'，' @ {7}”，{8}）你还应该抓住SQLExeprion

SQLite简单插入查询

3 个答案: