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135 lines
4.3 KiB
Tcl
135 lines
4.3 KiB
Tcl
# tdbcpostgres.tcl --
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#
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# Class definitions and Tcl-level methods for the tdbc::postgres bridge.
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#
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# Copyright (c) 2009 by Slawomir Cygan
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#
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# See the file "license.terms" for information on usage and redistribution
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# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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#
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#------------------------------------------------------------------------------
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package require tdbc
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::namespace eval ::tdbc::mypostgres {
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namespace export connection datasources drivers
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}
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#------------------------------------------------------------------------------
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#
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# tdbc::postgres::connection --
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#
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# Class representing a connection to a Postgres database.
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#
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#-------------------------------------------------------------------------------
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::oo::class create ::tdbc::postgres::connection {
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superclass ::tdbc::connection
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# The constructor is written in C. It takes alternating keywords
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# and values pairs as its arguments. (See the manual page for the
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# available options.)
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# The 'statementCreate' method delegates to the constructor of the
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# statement class
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forward statementCreate ::tdbc::postgres::statement create
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# The 'prepareCall' method gives a portable interface to prepare
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# calls to stored procedures. It delegates to 'prepare' to do the
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# actual work.
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method preparecall {call} {
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regexp {^[[:space:]]*(?:([A-Za-z_][A-Za-z_0-9]*)[[:space:]]*=)?(.*)} \
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$call -> varName rest
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if {$varName eq {}} {
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my prepare \\{$rest\\}
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} else {
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my prepare \\{:$varName=$rest\\}
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}
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}
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# The 'init', 'begintransaction', 'commit, 'rollback', 'tables'
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# and 'columns' methods are implemented in C.
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}
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#------------------------------------------------------------------------------
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#
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# tdbc::postgres::statement --
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#
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# The class 'tdbc::postgres::statement' models one statement against a
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# database accessed through a Postgres connection
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#
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#------------------------------------------------------------------------------
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::oo::class create ::tdbc::postgres::statement {
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superclass ::tdbc::statement
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# The 'resultSetCreate' method forwards to the constructor of the
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# result set.
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forward resultSetCreate ::tdbc::postgres::resultset create
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# Methods implemented in C:
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#
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# constructor connection SQLCode
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# The constructor accepts the handle to the connection and the SQL code
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# for the statement to prepare. It creates a subordinate namespace to
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# hold the statement's active result sets, and then delegates to the
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# 'init' method, written in C, to do the actual work of preparing the
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# statement.
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# params
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# Returns descriptions of the parameters of a statement.
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# paramtype paramname ?direction? type ?precision ?scale??
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# Declares the type of a parameter in the statement
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}
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#------------------------------------------------------------------------------
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#
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# tdbc::postgres::resultset --
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#
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# The class 'tdbc::postgres::resultset' models the result set that is
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# produced by executing a statement against a Postgres database.
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#
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#------------------------------------------------------------------------------
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::oo::class create ::tdbc::postgres::resultset {
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superclass ::tdbc::resultset
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# The 'nextresults' method is stubbed out; tdbcpostgres does not
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# allow a single call to return multiple results.
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method nextresults {} {
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while {[my nextdict rubbish]} {}
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return 0
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}
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# Methods implemented in C include:
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# constructor statement ?dictionary?
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# -- Executes the statement against the database, optionally providing
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# a dictionary of substituted parameters (default is to get params
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# from variables in the caller's scope).
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# columns
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# -- Returns a list of the names of the columns in the result.
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# nextdict
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# -- Stores the next row of the result set in the given variable in
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# the caller's scope as a dictionary whose keys are
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# column names and whose values are column values, or else
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# as a list of cells.
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# nextlist
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# -- Stores the next row of the result set in the given variable in
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# the caller's scope as a list of cells.
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# rowcount
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# -- Returns a count of rows affected by the statement, or -1
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# if the count of rows has not been determined.
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}
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