PostreSQL 的模式创建的代码位于何处

[作者：技术者高健@博客园  mail: [email protected]]

主要代码在 src/backend/catalog/pg_namespace.c

/* ----------------                        

 * NamespaceCreate                        

 *                        

 * Create a namespace (schema) with the given name and owner OID.                        

 *                        

 * If isTemp is true, this schema is a per-backend schema for holding                        

 * temporary tables.  Currently, the only effect of that is to prevent it                        

 * from being linked as a member of any active extension.  (If someone                        

 * does CREATE TEMP TABLE in an extension script, we don't want the temp                        

 * schema to become part of the extension.)                        

 * ---------------                        

 */                        

Oid                        

NamespaceCreate(const char *nspName, Oid ownerId, bool isTemp)                        

{                        

    ……                    

    nspoid = simple_heap_insert(nspdesc, tup);                    

    Assert(OidIsValid(nspoid));                    

                        

    CatalogUpdateIndexes(nspdesc, tup);                    

                        

    heap_close(nspdesc, RowExclusiveLock);                    

                        

    /* Record dependencies */                    

    myself.classId = NamespaceRelationId;                    

    myself.objectId = nspoid;                    

    myself.objectSubId = 0;                    

                        

    /* dependency on owner */                    

    recordDependencyOnOwner(NamespaceRelationId, nspoid, ownerId);                    

                        

    /* dependency on extension ... but not for magic temp schemas */                    

    if (!isTemp)                    

        recordDependencyOnCurrentExtension(&myself, false);                

                        

    /* Post creation hook for new schema */                    

    InvokeObjectAccessHook(OAT_POST_CREATE,                    

                   NamespaceRelationId, nspoid, 0, NULL);        

                        

    return nspoid;                    

    ……                    

}                        

NamespaceCreate 被 src/backend/commands/schemacmds.c 的 CreateSchemaCommand 调用

/*                            

 * CREATE SCHEMA                            

 */                            

void                            

CreateSchemaCommand(CreateSchemaStmt *stmt, const char *queryString)                            

{                            

    ……                        

    /* Create the schema's namespace */                        

    namespaceId = NamespaceCreate(schemaName, owner_uid, false);                        

                            

    /* Advance cmd counter to make the namespace visible */                        

    CommandCounterIncrement();                        

    ……                        

}                            

接下来，我特别想知道，得到的 oid ，被用到了什么地方，以何种方式存储。

[作者：技术者高健@博客园  mail: [email protected]]