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# tdbc.tcl -- connector for tdbc, the Tcl database abstraction layer
#
# Copyright 2024 The Apache Software Foundation
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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.
package require tdbc
package require DIO 1.2
package provide dio_Tdbc 1.2
namespace eval DIO {
::itcl::class Tdbc {
inherit Database
private variable connector_n
private variable connector
private variable tdbc_connector
private variable tdbc_arguments [list -encoding \
-isolation \
-readonly \
-timeout]
constructor {interface_name args} {eval configure -interface $interface_name $args} {
set connector_n 0
set connector ""
# I should check this one: we only accept connector
# interfaces that map into one of tdbc's supported drivers
#puts "tdbc interface: $interface_name"
set connector_name [::string tolower $interface_name]
if {$connector_name == "oracle"} {
set connector_name "odbc"
} elseif {$connector_name == "postgresql"} {
set connector_name "postgres"
}
set tdbc_connector "tdbc::${connector_name}"
uplevel #0 package require ${tdbc_connector}
}
destructor { }
private method check_connector {} {
if {$connector == ""} { open }
}
public method open {} {
set connector_cmd "${tdbc_connector}::connection create ${tdbc_connector}#$connector_n"
if {$user != ""} { lappend connector_cmd -user $user }
if {$db != ""} { lappend connector_cmd -db $db }
if {$pass != ""} { lappend connector_cmd -password $pass }
if {$port != ""} { lappend connector_cmd -port $port }
if {$host != ""} { lappend connector_cmd -host $host }
if {$clientargs != ""} { lappend connector_cmd {*}$clientargs }
#puts "evaluating $connector_cmd"
set connector [eval $connector_cmd]
incr connector_n
}
public method close {} {
if {$connector == ""} { return }
$connector close
set connector ""
}
protected method handle_client_arguments {cargs} {
set clientargs {}
lmap {k v} $cargs {
if {[lsearch $k $tdbcarguments] >= 0} {
lappend clientargs $k $v
}
}
}
public method exec {sql} {
$this check_connector
# tdbc doesn't like ';' at the end of a SQL statement
if {[::string index $sql end] == ";"} {set sql [::string range $sql 0 end-1]}
set is_select [regexp -nocase {^\(*\s*select\s+} $sql]
set tdbc_statement [$connector prepare $sql]
# errorinfo is a public variable of the
# parent class Database. Not a good
# object design practice
if {[catch {set tdbc_result [$tdbc_statement execute]} errorinfo]} {
set result_obj [$this result TDBC -error 1 -errorinfo [::list $errorinfo] -isselect false]
} else {
# we must store also the TDBC SQL statement as it owns
# the TDBC results set represented by tdbc_result. Closing
# a tdbc::statement closes also any active tdbc::resultset
# owned by it
set result_obj [$this result TDBC -resultid $tdbc_result \
-statement $tdbc_statement \
-isselect $is_select \
-fields [::list [$tdbc_result columns]]]
}
return $result_obj
}
}
::itcl::class TDBCResult {
inherit Result
public variable isselect false
public variable statement
public variable rowid
public variable cached_rows
public variable columns
constructor {args} {
eval configure $args
set cached_rows {}
set columns {}
set rowid 0
set rownum 0
set statement ""
}
destructor {}
public method destroy {} {
if {$statement != ""} { $statement close }
Result::destroy
}
public method current_row {} {return $rowid}
public method cached_results {} {return $cached_rows}
public method nextrow {} {
if {[llength $cached_rows] == 0} {
if {![$resultid nextrow -as lists row]} {
return ""
}
} else {
set cached_rows [lassign $cached_rows row]
}
incr rowid
return $row
}
public method numrows {} {
if {$isselect} {
# this is not scaling well at all but tdbc is not telling
# the number of columns for a select so must determine it
# from the whole set of results
if {[llength $cached_rows] == 0} {
set cached_rows [$resultid allrows -as lists -columnsvariable columns]
}
return [expr [llength $cached_rows] + $rowid]
} else {
return [$resultid rowcount]
}
}
}
}
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