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# dio_Tdbc.tcl -- Tdbc compatibility layer
#
# Copyright 2000-2005 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.
#
# DIO compatibility layer with Tdbc
#
# $Id: dio_Tdbc.tcl 1588062 2014-04-16 20:33:41Z mxmanghi $
#
package provide dio_Tdbc 0.1
namespace eval DIO {
::itcl::class Tdbc {
inherit Database
private variable dbhandle
public variable interface "Tdbc"
private common conncnt 0
public variable backend "" {
if {$backend == "mysql"} {
package require tdbc::mysql
} elseif {$backend == "postgres"} {
package require tdbc::postgres
} elseif {$backend == "sqlite3"} {
package require tdbc::sqlite3
} elseif {$backend == "odbc"} {
package require tdbc::odbc
} elseif {$backend == ""} {
return -code error "DIO Tdbc needs a backend be specified"
} else {
return -code error "backend '$backend' not supported"
}
}
# -- destructor
#
#
constructor {args} { eval configure $args } {
if {[catch {package require tdbc}]} {
return -code error "No Tdbc package available"
}
eval configure $args
if {[lempty $db]} {
if {[lempty $user]} {
set user $::env(USER)
}
set db $user
}
}
destructor { close }
# --close
#
# we take inspiration from the DIO_Mysql class for handling
# the basic connection data
public method close {} {
if {![info exists dbhandle]} { return }
catch { $dbhandle close }
unset dbhandle
}
# -- open
#
# Opening a connection with this class means that the member
# variable specifying the backend was properly set
#
public method open {} {
if {$backend == ""} {
return -code error "no backend set"
}
set command [::list ::tdbc::${backend}::connection create tdbc[incr conncnt]]
if {![lempty $user]} { lappend command -user $user }
if {![lempty $pass]} { lappend command -password $pass }
if {![lempty $port]} { lappend command -port $port }
if {![lempty $host]} { lappend command -host $host }
if {![lempty $db]} { lappend command -database $db }
if {[catch {
set dbhandle [eval $command]
} e]} { return -code error $e }
return -code ok
}
# -- exec
#
# sql code central method. A statement object
# is created from the sql string and then executed
#
public method exec {sql} {
if {![info exists dbhandle]} { $this open }
set sqlstat [$dbhandle prepare $sql]
if {[catch {set res [$sqlstat execute]} err]} {
set obj [result Tdbc -error 1 -errorinfo $err]
} else {
set obj [result Tdbc -resultid $res \
-sqlstatement $sqlstat \
-numrows [$res rowcount] \
-fields [::list [$res columns]]]
}
#$res nextlist cols
#puts "rows: [$res rowcount]"
#puts "cols: $cols"
return $obj
}
# -- execute
#
# extended version of the standard DIO method exec that
# makes room for an extra argument storing the dictionary
# of variables to be substituted in the SQL statement
#
public method execute {sql {substitute_d ""}} {
if {![info exists dbhandle]} { $this open }
set sqlstat [$dbhandle prepare $sql]
if {$substitute_d != ""} {
set cmd [list $sqlstat execute $substitude_d]
} else {
set cmd [list $sqlstat execute]
}
if {[catch {set res [eval $cmd]} err} {
set obj [result Tdbc -error 1 -errorinfo $err]
} else {
set obj [result Tdbc -resultid $res \
-numrows [$res rowcount] \
-fields [$res columns]]
}
$sqlstat close
return $obj
}
# -- handle
#
# accessor to the internal connection handle.
#
public method handle {} {
return $dbhandle
}
}
#
# -- Class TdbcResult
#
# Class wrapping a Tdbc resultset object and adapting it
# to the DIO Results interface
#
::itcl::class TdbcResult {
inherit Result
public variable sqlstatement
constructor {args} {
eval configure $args
}
destructor {
catch {$sqlstatement close}
}
# -- nextrow
#
# Returns the list of values selected by a SQL command.
# Values appear in the list with the same order of
# the columns names returned by the 'columns' object command
#
public method nextrow {} {
$resultid nextlist v
return $v
}
}
}
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