Public Overrides Function GetSchema(
     ByVal collection As String,
    ByVal restrictions As String()
) As DataTable

public override DataTable GetSchema(
     string collection,
    string[] restrictions
)

A DataTable that contains schema information.

These methods are used to query the database server for various metadata. Each type of metadata is given a collection name, which must be passed to receive that data. The default collection name is MetaDataCollections.

You can query the SQL Anywhere SQL Anywhere .NET Data Provider to determine the list of supported schema collections by calling the GetSchema method with no arguments, or with the schema collection name MetaDataCollections. This will return a DataTable with a list of the supported schema collections (CollectionName), the number of restrictions that they each support (NumberOfRestrictions), and the number of identifier parts that they use (NumberOfIdentifierParts).

These collection names are also available as read-only properties in the SAMetaDataCollectionNames class.

The results returned can be filtered by specifying an array of restrictions in the call to GetSchema.

The restrictions available with each collection can be queried by calling:

GetSchema( "Restrictions" )

If the collection requires four restrictions, then the restrictions parameter must be either NULL, or a string with four values.

To filter on a particular restriction, place the string to filter by in its place in the array and leave any unused places NULL. For example, the Tables collection has three restrictions: Owner, Table, and TableType.

To filter the Table collection by table_name:

GetSchema( "Tables", new string[ ] { NULL, "my_table", NULL } )

This returns information on all tables named my_table.

GetSchema( "Tables", new string[ ] { "DBA", "my_table", NULL } )

This returns information on all tables named my_table owned by the user DBA.

The following is a summary of the columns returned by each collection. If the number of rows returned in a collection can be reduced by specifying a restriction on a column, the restriction name for that column is shown in parenthesis. The order in which restrictions are specified is the order in which they are presented in the lists below.

Columns collection

DataSourceInformation collection

DataTypes collection

ForeignKeys collection

IndexColumns collection

Indexes collection

MetaDataCollections collection

ProcedureParameters collection

Procedures collection

ReservedWords collection

Restrictions collection

Tables collection

UserDefinedTypes collection

Users collection

ViewColumns collection

Views collection

• SAConnection class [SQL Anywhere .NET]