RowFilter LIKE 操作

发布于 2024-08-30 10:38:59 字数 215 浏览 5 评论 0原文

我知道以下内容不允许作为行过滤器

“canada%.txt”或“canada*.txt”

，我想我可以重写我的过滤器以

file_name like 'Canada%' and file_name like '%.txt'

使其工作。

但是有没有更简单的方法而不是确定 % 的位置并分割字符串呢？

原文

I know that the following is not allowed as a row filter

'canada%.txt' or 'canada*.txt'

and I guess I can rewrite my filter as

file_name like 'Canada%' and file_name like '%.txt'

should work.

But is there an easier way instead of determing where the % is and spliting the string?

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七月上 2024-09-06 10:38:59

我不认为过滤器表达式中允许使用 CHARINDEX。

您可以尝试从 C# 动态构建过滤器字符串（未经测试，但这里有一个可能的语法）：

//split the original string using the wildcard as the delimiter
string[] f = s.Split('%');

//use the resulting array to build the resultstring
string resultstring = 'file_name like "' + f[0] + '%" and file_name like "%' + f[1] + '"'

//view.RowFilter = resultstring;

I don't believe that CHARINDEX is allowed in the filter expression.

You might try to dynamically build the filter string from C# (very much untested, but here's a possible syntax):

//split the original string using the wildcard as the delimiter
string[] f = s.Split('%');

//use the resulting array to build the resultstring
string resultstring = 'file_name like "' + f[0] + '%" and file_name like "%' + f[1] + '"'

//view.RowFilter = resultstring;

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最丧也最甜 2024-09-06 10:38:59

这是我想出的解决方案

    private string CreateRowFilter(string remoteFilePattern)
    {
        string[] pattern = remoteFilePattern.Split(new char[] { '*', '%' });
        int length = pattern.GetUpperBound(0);

        if (length == 0)
        {
            return String.Format("Name = '{0}'", pattern[0]);

        }

        StringBuilder fileter = new StringBuilder(
                 String.Format("Name LIKE '{0}*' ", pattern[0]));

        for (int segment = 1; segment < length; segment++)
        {
            fileter.Append(
                 String.Format("AND Name LIKE '*{0}*' ", pattern[segment]));
        }

        if(String.IsNullOrEmpty(pattern[length]) == false)
        {
            fileter.Append(
                 String.Format("AND Name LIKE '*{0}' ", pattern[length]));
        }

        return fileter.ToString();
    }

Here is the solution that I came up with

    private string CreateRowFilter(string remoteFilePattern)
    {
        string[] pattern = remoteFilePattern.Split(new char[] { '*', '%' });
        int length = pattern.GetUpperBound(0);

        if (length == 0)
        {
            return String.Format("Name = '{0}'", pattern[0]);

        }

        StringBuilder fileter = new StringBuilder(
                 String.Format("Name LIKE '{0}*' ", pattern[0]));

        for (int segment = 1; segment < length; segment++)
        {
            fileter.Append(
                 String.Format("AND Name LIKE '*{0}*' ", pattern[segment]));
        }

        if(String.IsNullOrEmpty(pattern[length]) == false)
        {
            fileter.Append(
                 String.Format("AND Name LIKE '*{0}' ", pattern[length]));
        }

        return fileter.ToString();
    }

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