OleDb 异常

Question

搜索了 5 个小时，我找不到我的错误。我得到这个例外。怎么了？

An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in MyDictionary.exe

Additional information: Syntax error in INSERT INTO statement.

我的代码：

public void Insert(Word word)
{
    string language=FindLanguage();
    try
    {
        command.CommandText ="INSERT INTO "+language+" ( Native , Foreign , Definition , AddingDate)  values ( '" + word.Native + "' , '" + word.Foreign + "' , '" + word.Definition + "' ,'" + word.AddingDate + "')";
            command.CommandType = System.Data.CommandType.Text;
            connection.Open();

            command.ExecuteNonQuery();
    }
    catch (Exception)
    {
        throw;
    }
    finally
    {
        if (connection != null)
        {
            connection.Close();
        }
    }
}

Answer 1

您应该在插入中使用参数 statement.Also 看起来您缺少 command.Connection = connection;。请注意，您的 SQL 容易出现 SQL Injection

command.CommandText ="INSERT INTO "+language+"([Native],[Foreign],[Definition],[AddingDate]) VALUES (@Native,@Foreign,@Definition,@AddingDate)";

command.Parameters.AddWithValue("@Native", word.Native);
command.Parameters.AddWithValue("@Foreign",word.Foreign);
command.Parameters.AddWithValue("@Definition",word.Definition);
command.Parameters.AddWithValue("@AddingDate",word.AddingDate);

command.CommandType = System.Data.CommandType.Text;
command.Connection = connection;
connection.Open();

command.ExecuteNonQuery();

Answer 2

在 OleDb 中，INSERT INTO 语句的正确语法涉及 SELECT 子句的使用，即使您附加静态值也是如此。所以你需要像下面的例子一样改变你的查询。

此外，如果您实际上不处理引发的异常，请不要构造 try...catch..finally。为了便于处理，请改用 using() { } 块。所以这里是：

public void Insert(Word word)
{
    string language=FindLanguage();

    using (var connection = new OleDbConnection("connection string goes here"))
    using (var command = new OleDbCommand...)
    {
        command.CommandText = @
            "INSERT INTO " + language + "(Native, Foreign, Definition, AddingDate)" +
            "SELECT '"
                + word.Native + "' AS Native, '" 
                + word.Foreign + "' AS Foreign, '" 
                + word.Definition + "' AS Definition, '"
                + word.AddingDate + "' AS AddingDate"
        ;

        connection.Open();

        command.ExecuteNonQuery();

        connection.Close();
    }
}

OleDb 异常

OleDb Exception

c#

ms-access

oledb

oledbexception