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# aida.tcl -- agnostic interface to TDBC
# Copyright 2002-2004 The Apache Software Foundation
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# $Id: aida.tcl 1596885 2014-05-22 14:19:10Z mxmanghi $
package require Tcl 8.6
package require Itcl
source [file join [file dirname [info script]] sql.tcl]
namespace eval ::aida {
proc handle {interface args} {
set obj \#auto
set first [lindex $args 0]
if {![lempty $first] && [string index $first 0] != "-"} {
set args [lassign $args obj]
}
#uplevel \#0 package require dio_$interface
#return [uplevel \#0 ::DIO::$interface $obj $args]
return [uplevel \#0 ::aida::Aida [Sql $interface] $interface $obj $args]
}
# -- aida database interface class
::itcl::class Aida {
constructor { sqlobj args } {
set sql $sqlobj
eval $this configure $args
}
destructor {
close
}
protected method result {backend args}
public method quote {string} {}
protected method build_select_query {args} { }
protected method build_insert_query {arrayName fields {myTable ""}} {}
protected method build_update_query {arrayName fields {myTable ""}} {}
protected method lassign_array {list arrayName args} {}
private variable sql
}
::itcl::body Aida::build_select_query {args} {
return [$sqlobj build_select_query {*}$args]
}
# -- result
#
# returns a return object
#
::itcl::class Result {
public variable resultid ""
public variable fields ""
public variable rowid 0
public variable numrows 0
public variable error 0
public variable errorcode 0
public variable errorinfo ""
public variable autocache 1
protected variable cached 0
protected variable cacheSize 0
protected variable cacheArray
constructor {args} {
eval configure $args
}
destructor { }
method destroy {} {
::itcl::delete object $this
}
#
# seek - set the current row ID (our internal row cursor, if you will)
# to the specified row ID
#
method seek {newrowid} { set rowid $newrowid }
protected method configure_variable {varName string}
protected method lassign_array {list arrayName args}
public method cache {{size "all"}}
public method forall {type varName body}
public method next {type {varName ""}}
public method resultid {{string ""}} { return [configure_variable resultid $string] }
public method fields {{string ""}} { return [configure_variable fields $string] }
public method rowid {{string ""}} { return [configure_variable rowid $string] }
public method numrows {{string ""}} { return [configure_variable numrows $string] }
public method error {{string ""}} { return [configure_variable error $string] }
public method errorcode {{string ""}} { return [configure_variable errorcode $string] }
public method errorinfo {{string ""}} { return [configure_variable errorinfo $string] }
public method autocache {{string ""}} { return [configure_variable autocache $string] }
}
#
# configure_variable - given a variable name and a string, if the
# string is empty return the variable name, otherwise set the
# variable to the strings
#
::itcl::body Result::configure_variable {varName string} {
if {[lempty $string]} { return [cget -$varName] }
$this configure -$varName $string
}
#
# lassign_array - given a list, an array name, and a variable number
# of arguments consisting of variable names, assign each element in
# the list, in turn, to elements corresponding to the variable
# arguments, into the named array. From TclX.
#
::itcl::body Result::lassign_array {list arrayName args} {
upvar 1 $arrayName array
foreach elem $list field $args {
set array($field) $elem
}
}
::itcl::body Result::cache {{size "all"}} {
set cacheSize $size
if {$size == "all"} { set cacheSize $numrows }
## Delete the previous cache array.
catch {unset cacheArray}
set autostatus $autocache
set currrow $rowid
set autocache 1
seek 0
set i 0
while {[$this next -list list]} {
if {[incr i] >= $cacheSize} { break }
}
set autocache $autostatus
seek $currrow
set cached 1
}
#
# forall -- walk the result object, executing the code body over it
#
::itcl::body Result::forall {type varName body} {
upvar 1 $varName $varName
set currrow $rowid
seek 0
while {[next $type $varName]} {
uplevel 1 $body
}
set rowid $currrow
return
}
::itcl::body Result::next {type {varName ""}} {
set return 1
if {![lempty $varName]} {
upvar 1 $varName var
set return 0
}
catch {unset var}
set list ""
## If we have a cached result for this row, use it.
if {[info exists cacheArray($rowid)]} {
set list $cacheArray($rowid)
} else {
set list [$this nextrow]
if {[lempty $list]} {
if {$return} { return }
set var ""
return 0
}
if {$autocache} { set cacheArray($rowid) $list }
}
incr rowid
switch -- $type {
"-list" {
if {$return} {
return $list
} else {
set var $list
}
}
"-array" {
if {$return} {
foreach field $fields elem $list {
lappend var $field $elem
}
return $var
} else {
eval lassign_array [list $list] var $fields
}
}
"-keyvalue" {
foreach field $fields elem $list {
lappend var -$field $elem
}
if {$return} { return $var }
}
default {
incr rowid -1
return -code error \
"In-valid type: must be -list, -array or -keyvalue"
}
}
return [expr [lempty $list] == 0]
}
}
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