Not
Åtkomst till denna sida kräver auktorisation. Du kan prova att logga in eller byta katalog.
Åtkomst till denna sida kräver auktorisation. Du kan prova att byta katalog.
When an application calls SQLAllocEnv through an ODBC 3.x driver, the call to SQLAllocEnv(phenv) is mapped to SQLAllocHandle as follows:
The Driver Manager allocates an environment handle and returns it to the application. The Driver Manager calls SQLSetEnvAttr to set the SQL_ATTR_ODBC_VERSION environment attribute to SQL_OV_ODBC2.
When the application establishes the first connection to a driver, the Driver Manager calls
SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, OutputHandlePtr)in the driver with OutputHandlePtr set to phenv.