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DataStax C/C++ Driver

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struct CassValue

A single primitive value or a collection of values.

Functions

CassIterator *

cass_iterator_from_collection

( value )

Creates a new iterator for the specified collection. This can be used to iterate over values in a collection.

Parameters:
Name Type Details
in value
Returns:
Type Details
CassIterator *

A new iterator that must be freed. NULL returned if the value is not a collection.
See Also:
CassIterator *

cass_iterator_from_map

( value )

Creates a new iterator for the specified map. This can be used to iterate over key/value pairs in a map.

Parameters:
Name Type Details
in value
Returns:
Type Details
CassIterator *

A new iterator that must be freed. NULL returned if the value is not a map.
See Also:
CassError

cass_value_get_int32

( value, output )

Gets an int32 for the specified value.

Parameters:
Name Type Details
in value
out output
Returns:
Type Details
CassError

CASS_OK if successful, otherwise error occurred
CassError

cass_value_get_int64

( value, output )

Gets an int64 for the specified value.

Parameters:
Name Type Details
in value
out output
Returns:
Type Details
CassError

CASS_OK if successful, otherwise error occurred
CassError

cass_value_get_float

( value, output )

Gets a float for the specified value.

Parameters:
Name Type Details
in value
out output
Returns:
Type Details
CassError

CASS_OK if successful, otherwise error occurred
CassError

cass_value_get_double

( value, output )

Gets a double for the specified value.

Parameters:
Name Type Details
in value
out output
Returns:
Type Details
CassError

CASS_OK if successful, otherwise error occurred
CassError

cass_value_get_bool

( value, output )

Gets a bool for the specified value.

Parameters:
Name Type Details
in value
out output
Returns:
Type Details
CassError

CASS_OK if successful, otherwise error occurred
CassError

cass_value_get_uuid

( value, output )

Gets a UUID for the specified value.

Parameters:
Name Type Details
in value
out output
Returns:
Type Details
CassError

CASS_OK if successful, otherwise error occurred
CassError

cass_value_get_inet

( value, output )

Gets an INET for the specified value.

Parameters:
Name Type Details
in value
out output
Returns:
Type Details
CassError

CASS_OK if successful, otherwise error occurred
CassError

cass_value_get_string

( value, output, output_size )

Gets a string for the specified value.

Parameters:
Name Type Details
in value
out output
out output_size
Returns:
Type Details
CassError

CASS_OK if successful, otherwise error occurred
CassError

cass_value_get_bytes

( value, output, output_size )

Gets the bytes of the specified value.

Parameters:
Name Type Details
in value
out output
out output_size
Returns:
Type Details
CassError

CASS_OK if successful, otherwise error occurred
CassError

cass_value_get_decimal

( value, varint, varint_size, scale )

Gets a decimal for the specified value.

Parameters:
Name Type Details
in value
out varint
out varint_size
out scale
Returns:
Type Details
CassError

CASS_OK if successful, otherwise error occurred
CassValueType

cass_value_type

( value )

Gets the type of the specified value.

Parameters:
Name Type Details
in value
Returns:
Type Details
CassValueType

The type of the specified value.
cass_bool_t

cass_value_is_null

( value )

Returns true if a specified value is null.

Parameters:
Name Type Details
in value
Returns:
Type Details
cass_bool_t

true if the value is null, otherwise false.
cass_bool_t

cass_value_is_collection

( value )

Returns true if a specified value is a collection.

Parameters:
Name Type Details
in value
Returns:
Type Details
cass_bool_t

true if the value is a collection, otherwise false.
size_t

cass_value_item_count

( collection )

Get the number of items in a collection. Works for all collection types.

Parameters:
Name Type Details
in collection
Returns:
Type Details
size_t

Count of items in a collection. 0 if not a collection.
CassValueType

cass_value_primary_sub_type

( collection )

Get the primary sub-type for a collection. This returns the sub-type for a list or set and the key type for a map.

Parameters:
Name Type Details
in collection
Returns:
Type Details
CassValueType

The type of the primary sub-type. CASS_VALUE_TYPE_UNKNOWN returned if not a collection.
CassValueType

cass_value_secondary_sub_type

( collection )

Get the secondary sub-type for a collection. This returns the value type for a map.

Parameters:
Name Type Details
in collection
Returns:
Type Details
CassValueType

The type of the primary sub-type. CASS_VALUE_TYPE_UNKNOWN returned if not a collection or not a map.