Question

我对这个SQL语句有些麻烦。我搜索了周围，但无法找到awnser。所以这是我用来获取适合我的condidtions的用户数据的声明：

SqlConnection connection = null;
try
{
    connection = new SqlConnection(Main.Settings.Connectionstring);
    connection.Open();
}
catch (Exception)
{
    MessageBox.Show("Failure at creating a connection to the database!", "Fehler", MessageBoxButtons.OK, MessageBoxIcon.Error);
    return;
}
if (tabPage == TabPageEnum.Email)
{
    SqlCommand importUser = new SqlCommand("select      address.ADR_FIRSTNAME, address.ADR_LASTNAME, address.ADR_EMAIL1, address.ADR_ID" +
                                            "from       dbo.ADDRESS as address, dbo.EMPLOYEE as emp" +
                                            "where      emp.EMP_ADR_ID = address.ADR_ID" +
                                            "and        address.GCRecord IS NULL" +
                                            "and        address.ADR_EMAIL1 IS NOT NULL" +
                                            "and        (address.ADR_FIRSTNAME IS NOT NULL" +
                                            "or         address.ADR_LASTNAME IS NOT NULL)", connection);
}

我感谢任何帮助！如果还有其他需要的信息，请告诉我。

Answer 1

address.ADR_ID" + "from

结果为：address.ADR_IDfrom

您应该在查询的不同部分的末尾或开头添加空格。

喜欢这个::

address.ADR_ID " + "from

Answer 2

你检查了空格吗？我认为命令的每一行都缺少一个空格

Answer 3

像

这样的结构

ADR_ID" + "from        dbo.ADDRESS as address, dbo.EMPLOYEE as emp

会给你

ADR_IDfrom       dbo.ADDRESS as address, dbo.EMPLOYEE as emp

其中 ADR_IDfrom 显然不是有效的SQL。您需要在每个字符串的末尾放置空格，以便形成有效的SQL 还要考虑将代码放入try块并检查异常。它可能对你有很大帮助。请参阅SqlError class。

Answer 4

与其他提到的一样，缺少空格是你的问题。

编写查询的另一种方法是使用@ - 引用的字符串。使用它，您不必转义任何字符，并且可以轻松编写多行字符串：

SqlCommand importUser = new SqlCommand(
        @"select   address.ADR_FIRSTNAME, address.ADR_LASTNAME, address.ADR_EMAIL1, address.ADR_ID
            from       dbo.ADDRESS as address, dbo.EMPLOYEE as emp
            where      emp.EMP_ADR_ID = address.ADR_ID
            and        address.GCRecord IS NULL
            and        address.ADR_EMAIL1 IS NOT NULL
            and        (address.ADR_FIRSTNAME IS NOT NULL
            or         address.ADR_LASTNAME IS NOT NULL)", connection);

Answer 5

你检查过这个空间。打开它有帮助

SQL语句错误的语法

5 个答案: