大约有 43,000 项符合查询结果(耗时:0.0756秒) [XML]

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static const vs #define

...l than a post-preprocessing "if" as the code need not be compilable if not selected by the preprocessor), use #undef-ine, redefine etc. substituted text has to be exposed: in the translation unit it's used by, which means macros in libraries for client use must be in the header, so make and other ...
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How to read a CSV file into a .NET Datatable

...e(path); string fileName = Path.GetFileName(path); string sql = @"SELECT * FROM [" + fileName + "]"; using(OleDbConnection connection = new OleDbConnection( @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + pathOnly + ";Extended Properties=\"Text;HDR=" + h...
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How do I trim leading/trailing whitespace in a standard way?

... allocated. The return // value must NOT be deallocated using free() etc. char *trimwhitespace(char *str) { char *end; // Trim leading space while(isspace((unsigned char)*str)) str++; if(*str == 0) // All spaces? return str; // Trim trailing space end = str + strlen(str) - 1; ...
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How do I search an SQL Server database for a string?

...T) INSERT INTO @Temp(TableName,SchemaName, ColumnName, DataType) SELECT C.Table_Name,C.TABLE_SCHEMA, C.Column_Name, C.Data_Type FROM Information_Schema.Columns AS C INNER Join Information_Schema.Tables AS T ON C.Table_Name = T.Table_Name AND C.TA...
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Import CSV file to strongly typed data structure in .Net [closed]

...tring); objConn.Open(); DataTable dt = new DataTable(); OleDbCommand objCmdSelect = new OleDbCommand("SELECT * FROM file.csv", objConn); OleDbDataAdapter objAdapter1 = new OleDbDataAdapter(); objAdapter1.SelectCommand = objCmdSelect; objAdapter1.Fill(dt); objConn.Close(); ...
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How to make MySQL handle UTF-8 properly

...til just recently), and not complete (does not discuss correctly inserting/selecting utf8-encoded data, nor displaying in html). – Rick James Jan 20 '16 at 3:28 ...
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Can I embed a custom font in an iPhone application?

...Full name" of the font, which is visible by opening it up in Font Book and selecting: Preview --> Show Font Info – electromaggot Nov 20 '11 at 8:16 add a comment ...
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Delete column from SQLite table

... TRANSACTION; CREATE TEMPORARY TABLE t1_backup(a,b); INSERT INTO t1_backup SELECT a,b FROM t1; DROP TABLE t1; CREATE TABLE t1(a,b); INSERT INTO t1 SELECT a,b FROM t1_backup; DROP TABLE t1_backup; COMMIT; share | ...
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Difference between signed / unsigned char [duplicate]

...gnify if the number if positive or negative, but how does this apply to a char ? How can a character be positive or negative? ...
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What is an unsigned char?

In C/C++, what an unsigned char is used for? How is it different from a regular char ? 17 Answers ...