Package org.apache.cassandra.db

Class SchemaCQLHelper

java.lang.Object
org.apache.cassandra.db.SchemaCQLHelper
public class SchemaCQLHelper extends Object
Helper methods to represent TableMetadata and related objects in CQL format

  • Constructor Details

    • SchemaCQLHelper

      public SchemaCQLHelper()

  • Method Details

    • reCreateStatementsForSchemaCql

      public static Stream<String> reCreateStatementsForSchemaCql(TableMetadata metadata, KeyspaceMetadata keyspaceMetadata)
      Generates the DDL statement for a schema.cql snapshot file.

    • getTableMetadataAsCQL

      public static String getTableMetadataAsCQL(TableMetadata metadata, KeyspaceMetadata keyspaceMetadata)
      Build a CQL String representation of Column Family Metadata. *Note*: this is _only_ visible for testing; you generally shouldn't re-create a single table in isolation as that will not contain everything needed for user types.

    • getUserTypesAsCQL

      public static Stream<String> getUserTypesAsCQL(TableMetadata metadata, Types types, boolean ifNotExists)
      Build a CQL String representation of User Types used in the given table. Type order is ensured as types are built incrementally: from the innermost (most nested) to the outermost.
      Parameters:
      metadata - the table for which to extract the user types CQL statements.
      types - the user types defined in the keyspace of the dumped table (which will thus contain any user type used by metadata).
      ifNotExists - set to true if IF NOT EXISTS should be appended after CREATE TYPE string.
      Returns:
      a list of CREATE TYPE statements corresponding to all the types used in metadata.

    • getIndexesAsCQL

      public static Stream<String> getIndexesAsCQL(TableMetadata metadata, boolean ifNotExists)
      Build a CQL String representation of Indexes on columns in the given Column Family
      Parameters:
      metadata - the table for which to extract the index CQL statements.
      ifNotExists - set to true if IF NOT EXISTS should be appended after CREATE INDEX string.
      Returns:
      a list of CREATE INDEX statements corresponding to table metadata.

    • toCqlType

      public static String toCqlType(AbstractType<?> type)
      Converts the type to a CQL type. This method special cases empty and UDTs so the string can be used in a create statement. Special cases
      • empty - replaces with 'org.apache.cassandra.db.marshal.EmptyType'. empty is the tostring of the type in CQL but not allowed to create as empty, but fully qualified name is allowed
      • UserType - replaces with TupleType