pypyodbc.py 文件源码

def AllocateEnv():
    if pooling:
        ret = ODBC_API.SQLSetEnvAttr(SQL_NULL_HANDLE, SQL_ATTR_CONNECTION_POOLING, SQL_CP_ONE_PER_HENV, SQL_IS_UINTEGER)
        check_success(SQL_NULL_HANDLE, ret)

    ''' 
    Allocate an ODBC environment by initializing the handle shared_env_h
    ODBC enviroment needed to be created, so connections can be created under it
    connections pooling can be shared under one environment
    '''
    global shared_env_h 
    shared_env_h  = ctypes.c_void_p()
    ret = ODBC_API.SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, ADDR(shared_env_h))
    check_success(shared_env_h, ret)

    # Set the ODBC environment's compatibil leve to ODBC 3.0
    ret = ODBC_API.SQLSetEnvAttr(shared_env_h, SQL_ATTR_ODBC_VERSION, SQL_OV_ODBC3, 0)
    check_success(shared_env_h, ret)