object Catalog extends Serializable
The Catalog object keeps track of relations in the database.
It maintains two Maps: one mapping name to relation schema and the other
mapping name to relation object stored in memory.
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- def add(name: String, colName: ArrayBuffer[String], key: Int, domain: String = null, rel: Tabular = null): Unit
Add meta-data about the new relation to the catalog.
Add meta-data about the new relation to the catalog.
- name
the name of the relation
- colName
the names of columns
- key
the column number for the primary key (< 0 => no primary key)
- domain
an optional string indicating domains for columns (e.g., 'SD' = 'StrNum', 'Double')
- rel
the relation
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- def clear(): Unit
Remove all relations from the catalog.
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- def getRelation(name: String): Tabular
Get the relation object for the relation named 'name'.
Get the relation object for the relation named 'name'.
- name
the name of the relation
- def getSchema(name: String): (ArrayBuffer[String], Int, String)
Get the schema/meta-data about the relation named 'name'.
Get the schema/meta-data about the relation named 'name'.
- name
the name of the relation
- def hashCode(): Int
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- def names: Iterable[String]
Return an iterator over all relations names in the catalog.
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- def remove(name: String): Unit
Remove the relation named 'name' from the catalog.
Remove the relation named 'name' from the catalog.
- name
the name of the relation
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