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62 lines
2.0 KiB
C++
62 lines
2.0 KiB
C++
/*-------------------------------------------------------------------------
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*
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* pgcursordb.h
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*
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*
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* DESCRIPTION
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* Postgres Cursor Database Class:
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* Query Postgres backend using a cursor
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*
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* NOTES
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* Currently under construction.
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PGCURSOR_H
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#define PGCURSOR_H
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#include "pgtransdb.h"
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// ****************************************************************
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//
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// PgCursor - a class for querying databases using a cursor
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//
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// ****************************************************************
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// This is the database access class that declares a cursor and
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// manipulates data through it. The interface will introduce some
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// ease of use through the methods that will allow cursor specific
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// operations, like fetch, forward, etc.
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class PgCursor : public PgTransaction {
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public:
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PgCursor(const char* dbName, const char* cursor); // use reasonable defaults
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// connect to the database with given environment and database name
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PgCursor(const PgEnv& env, const char* dbName, const char* cursor);
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PgCursor(const PgConnection&, const char* cursor);
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virtual ~PgCursor(); // close connection and clean up
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// Commands associated with cursor interface
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int Declare(const string& query, int binary = 0); // Declare a cursor with given name
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int Fetch(const char* dir = "FORWARD"); // Fetch ALL tuples in given direction
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int Fetch(unsigned num, const char* dir = "FORWARD"); // Fetch specified amount of tuples
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int Close(); // Close the cursor
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// Accessors to the cursor name
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const char* Cursor() const { return pgCursor.c_str(); }
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void Cursor(const string& cursor) { pgCursor = cursor; }
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protected:
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int Fetch(const string& num, const string& dir);
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protected:
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string pgCursor;
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protected:
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PgCursor() : PgTransaction() {} // Do not connect
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}; // End PgCursor Class Declaration
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#endif // PGCURSOR_H
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