Compression (Property)

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Compression (Property)

In french: Compression

Available only with this kind of connection

The Compression property is used to manage data compression during a connection (HFSQL Client/Server, etc.). You can:

Determine whether the connection sends compressed data.
Define whether the data transferred between the server and the client should be compressed. In this case, when you open a file that uses an open connection, that connection will be closed and reopened with the new parameters.

Reminder Data compression reduces the volume of data passing through the transmission medium (which can be an advantage for transmissions billed by the data transmitted). Data compression is supported from HFSQL server version 14. For more details, see Compressing frames.

Note: The connection can correspond:

a connection defined in the data model editor,
a connection defined with HConnect, HDescribeConnection or HOpenConnection.
a connection defined with a variable of type Connection.

Example

MyConnection is Connection
// Describe the connection
MyConnection.User = "USER"
MyConnection.Password = "PASSWORD"
MyConnection.Server = "MYSERVER" 
MyConnection.Database = "Test"
MyConnection.Provider = hAccessHFClientServer
MyConnection.Access = hOReadWrite
MyConnection.ExtendedInfo = "Extended information"
MyConnection.CursorOptions = hClientCursor
MyConnection.Compression = True

HOpenConnection(MyConnection)

Syntax

Determining whether the connection sends compressed data Hide the details

<Result> = <Connection>.Compression

<Result>: Boolean

True if transmitted data is compressed,
False if transmitted data is not compressed.
Note Compression management is available from version 14 of the HFSQL server.

<Connection>: Character string or Connection variable

Name of the connection used. This name is defined:
in the data model editor,
with the HDescribeConnection and HOpenConnection functions,
with the Connection type.

Defining data compression for a connection Hide the details

<Connection>.Compression = <Data compression>

<Connection>: Character string or Connection variable

Name of the connection used. This name is defined:
in the data model editor,
with the HDescribeConnection and HOpenConnection functions,
with the Connection type.

<Data compression>: Boolean

True to compress the data,
False not to compress the data.
Note Compression management is available from version 14 of the HFSQL server.