Question

我正在尝试获取下面的查询结果并将其显示在listBox中，但我一直收到此错误：

＆＃39; a＆＃39;附近的语法错误。

这是我的代码：

SqlConnection con = new SqlConnection(@"Data Source=JOHZZ\SQLEXPRESS;Initial Catalog=parking;Persist Security Info=True;User ID=SA;Password=Roses2004");

SqlCommand c3 = new SqlCommand("SELECT targa" +
                               "FROM mjete AS m " + 
                               "INNER JOIN abonimi_mjet AS a" +
                               "ON m.mjeti_id = a.mjeti_id" +
                               "WHERE a.statusi = 'PASIV'" +
                               "AND m.klient_id = @idK", con);

con.Open();
c3.Parameters.AddWithValue("@idK",idK);

SqlDataReader reader2 = c3.ExecuteReader();

while (reader2.Read())
{
    listBoxTarga.Items.Add(reader2.GetString(0));
}

reader2.Close();
con.Close();

我在SQL Server Management Studio中尝试了相同的查询，但它运行正常。

提前感谢您的帮助。

Answer 1

你的线之间需要一个空格。使用+符号将它们一起添加为一个字符串，只需在每个字符串的末尾添加一个空格。

SqlCommand c3 = new SqlCommand("SELECT targa " +
       "FROM mjete AS m INNER JOIN abonimi_mjet AS a " +
       "ON m.mjeti_id = a.mjeti_id " +
       "WHERE a.statusi = 'PASIV' " +
       "AND m.klient_id = @idK", con);

由于c＃文件中的换行符不是字符串换行符，所以现在你得到的是这个字符串。

"SELECT targaFROM mjete AS m INNER JOIN abonimi_mjet AS aON m.mjeti_id = a.mjeti_idWHERE a.statusi = 'PASIV'AND m.klient_id = @idK"

旁注

您应该将SqlConnection实例封装在using块中，以确保在使用它时始终关闭/处置它（即使在出现异常时）。您的SqlDataReader实例也是如此。

无法在C＃中的内部联接查询中修复语法错误

1 个答案:

旁注