CASE value WHEN [compare_value] THEN result [WHEN [compare_value] THEN result ...] [ELSE result] END 语法二: CASE WHEN [condition] THEN result [WHEN [condition] THEN result ...] [ELSE result] END 1. 2. 3. 4. eg1(语法1):SELECT CASE 1 WHEN 1 THEN 'one' WHEN 2 THEN 'two' ...
node:A string, or a pointer to it, that specifies the domain name or IP address that we want to get the information from. If node is a hostname,getaddrinfo()resolves to its IP address. This input argument accepts an IPv4, IPv6, or domain name. service:A string or a pointer to it...
SQLRETURN SQLGetInfo( SQLHDBC ConnectionHandle, SQLUSMALLINT InfoType, SQLPOINTER InfoValuePtr, SQLSMALLINT BufferLength, SQLSMALLINT * StringLengthPtr); Arguments ConnectionHandle [Input] Connection handle. InfoType [Input] Type of information. InfoValuePtr [Output] Pointer to a buffer in which...
ifm interfaces interface name interface-name interface-ip-pool select-interface options option option-code code [ sub-options sub-option sub-option-code sub-code ] { ascii-string ascii-string | hex-string hex-string | ip-addresses ip-address &<1-8> } Determine whether to switch the interface...
SQL TypeC/C++ Type STRING char * INTEGER long long REAL double It is also possible to declare a DECIMAL function, but the value is returned as a string, so you should write the function as though it were a STRING function. ROW functions are not implemented. xxx_init() The initializat...
This value can be passed to filter_insert to insert the filter in a particular filter stack.Syntax const Filter *filter_create(const char *name, int order, const FilterMethods *methods);Return Values The const Filter * that identifies the filter, or NULL if an error occurs....
A runtime error will occur if a null value is input to such a parameter for a CALLED ON NULL INPUT function. For more information, see Defining the parameters in CREATE FUNCTION. parameter-name Names the parameter. Although not required, a parameter name can be specified for each parameter....
%c - The character according to the ASCII value %d - Signed decimal number (negative, zero or positive) %e - Scientific notation using a lowercase (e.g. 1.2e+2) %u - Unsigned decimal number (equal to or greather than zero) %f - Floating-point number %o - Octal number %s - String ...
Return value Type:int If the function succeeds, the return value is the number of characters stored in the output buffer, not counting the terminating null character. If the function fails, the return value is less than the length of the expected output. To get extended error information, cal...
This value can be passed to filter_insert to insert the filter in a particular filter stack.Syntax const Filter *filter_create(const char *name, int order, const FilterMethods *methods);Return Values The const Filter * that identifies the filter, or NULL if an error occurs....