大约有 13,000 项符合查询结果(耗时:0.0292秒) [XML]

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SQL injection that gets around mysql_real_escape_string()

...ollowing query: $iId = mysql_real_escape_string("1 OR 1=1"); $sSql = "SELECT * FROM table WHERE id = $iId"; mysql_real_escape_string() will not protect you against this. The fact that you use single quotes (' ') around your variables inside your query is what protects you against this. The fo...
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Prepend a level to a pandas MultiIndex

... A nice way to do this in one line using pandas.concat(): import pandas as pd pd.concat([df], keys=['Foo'], names=['Firstlevel']) An even shorter way: pd.concat({'Foo': df}, names=['Firstlevel']) This can be generalized to many data frames, see the docs. ...
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Multiline string literal in C#

... in front of a string to form a verbatim string literal: string query = @"SELECT foo, bar FROM table WHERE id = 42"; You also do not have to escape special characters when you use this method, except for double quotes as shown in Jon Skeet's answer. ...
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How to write a simple Html.DropDownListFor()?

...%= Html.DropDownListFor(n => n.MyColorId, new SelectList(Colors, "ColorId", "Name")) %> share | improve this answer | follow |...
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Natural Sort Order in C#

...haNumeric<T>(this IEnumerable<T> source, Func<T, string> selector) { int max = source .SelectMany(i => Regex.Matches(selector(i), @"\d+").Cast<Match>().Select(m => (int?)m.Value.Length)) .Max() ?? 0; return source.OrderBy(i => Regex.Replace(s...
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How to display the function, procedure, triggers source code in postgresql?

... For function: you can query the pg_proc view , just as the following select proname,prosrc from pg_proc where proname= your_function_name; Another way is that just execute the commont \df and \ef which can list the functions. skytf=> \df ...
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How to get Time from DateTime format in SQL?

... SQL Server 2008: SELECT cast(AttDate as time) [time] FROM yourtable Earlier versions: SELECT convert(char(5), AttDate, 108) [time] FROM yourtable share |...
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COUNT DISTINCT with CONDITIONS

... You can try this: select count(distinct tag) as tag_count, count(distinct (case when entryId > 0 then tag end)) as positive_tag_count from your_table_name; The first count(distinct...) is easy. The second one, looks somewhat complex...
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Join vs. sub-query

... @JinghuiNiu Customers who bought expensive items: select custid from cust join bought using (custid) where price > 500. If a customer bought multiple expensive items, you'll get double-ups. To fix this, select custid from cust where exists (select * from bought where cust...
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SQL query to group by day

...dateadd(DAY,0, datediff(day,0, created)) return '2009-11-02 00:00:00.000' select sum(amount) as total, dateadd(DAY,0, datediff(day,0, created)) as created from sales group by dateadd(DAY,0, datediff(day,0, created)) share ...