SQLRETURN SQLGetInfo( SQLHDBC ConnectionHandle, SQLUSMALLINT InfoType, SQLPOINTER InfoValuePtr, SQLSMALLINT BufferLength, SQLSMALLINT * StringLengthPtr); 参数 ConnectionHandle [输入] 连接句柄。 InfoType [输入]信息类型。 InfoValuePtr [输出]指向要在其中返回信息的缓冲区的指针。 根据所请求的 InfoT...
name初始ThirdAndFourthCharacters mastermst tempdbtmp modelmde msdbmdb 若要显示字符串常量abcdef的第二、第三和第四个字符,请使用以下查询。 SQL SELECTSUBSTRING('abcdef',2,3)ASx; 结果集如下。 输出 x --- bcd B. 将 SUBSTRING 与文本、ntext 和图像数据配合使用 备注 若要运行...
使用 CONCAT 函数：CONCAT 函数可以将多个字段拼接在一起。例如，将 FirstName、MiddleName 和 LastName...
The string can have a maximum of 255 characters. NAME = { backup_set_name | @backup_set_var } Specifies the name of the backup set. Names can have a maximum of 128 characters. If NAME is not specified, it is blank. { EXPIREDATE ='date' | RETAINDAYS = days } Specifies when the ...
ASCII values for extended characters Assign empty string '' if datetime is null Assign EXEC output to Variable Assigning NULL value to column name using Case Statement of where is SQL SERVER 2008 atomic if not exists() and insert or update Attempt to fetch logical page (1:155534) in databas...
Is a string of characters without spaces or punctuation. phrase Is one or more words with spaces between each word. Note Some languages, such as those written in some parts of Asia, can have phrases that consist of one or more words without spaces between them. <simple_term> Specifies a ...
Legacy binary collations compared the first character as WCHAR, followed by a byte-by-byte comparison. In a BIN collation, only the first character is sorted according to the code point, and remaining characters are sorted according to their byte values. The newer BIN2 collations, which ...
column_name can consist of 1 through 128 characters. data_type Specifies the column data type. For Transact-SQL functions, all data types, including CLR user-defined types, are allowed except timestamp. For CLR functions, all data types, including CLR user-defined types, are allowed except ...
如果StringLengthPtr 指向的位置中的值大于 BufferLength 中指定的长度,则字符串输出信息将被截断为 BufferLength 字节,函数返回 SQL_SUCCESS_WITH_INFO。 用法 请参SQLGetInfo( 返回的信息, InfoType可能值列表,以及 SQLGetInfo() 函数针对该值返回的信息描述。 返回码 SQL_SUCCESS SQL_SUCCESS_WITH_INFO SQL_ERRO...
for example, when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and unexpectedly executed. SQL injection is mostly known as an attack vector for websites but can be used to attack any type of SQL da...