- Publicity: Public Only All
acs-db-00-procs.tcl
Low level interface for defining the basic classes for the DB interface.
This file defines the following Objects and Classes: ::acs::db::Driver
, ::acs::db::nsdb
- Location:
- packages/acs-tcl/tcl/acs-db-00-procs.tcl
- Created:
- 2022-02-07
- Author:
- Gustaf Neumann
Procedures in this file
- Class ::acs::db::Driver (public)
- Class ::acs::db::nsdb (public)
- Class ::acs::db::nsdbi (public)
- acs::db::Driver instproc qn (public)
- acs::db::nsdb instproc list (public)
- acs::db::nsdb instproc list_of_lists (public)
- acs::db::nsdbi instproc list (public)
- acs::db::nsdbi instproc list_of_lists (public)
Detailed information
Class ::acs::db::Driver (public)
::nx::Class ::acs::db::DriverAbstract class of the database interface
- Testcases:
- No testcase defined.
Class ::acs::db::nsdb (public)
::nx::Class ::acs::db::nsdbDatabase interface based on the nsdb driver of NaviServer
- Testcases:
- No testcase defined.
Class ::acs::db::nsdbi (public)
::nx::Class ::acs::db::nsdbiDatabase interface based on the nsdbi driver of NaviServer
- Testcases:
- No testcase defined.
acs::db::Driver method qn (public)
<instance of acs::db::Driver> qn query_nameReturn fully qualified query name as used in OpenACS.
- Parameters:
- query_name (required)
- Testcases:
- No testcase defined.
acs::db::nsdb method list (public)
<instance of acs::db::nsdb> list [ -dbn dbn ] [ -bind bind ] \
[ -prepare prepare ] qn sqlReturn a Tcl list, where each element contains just the first the column values of the tuples returned by the provided SQL query.
- Switches:
- -dbn (optional)
- database identifier
- -bind (optional)
- optional bind variables for the SQL query
- -prepare (optional)
- type information for the bind variables in the prepared statement
- Parameters:
- qn (required)
- name of the SQL query
- sql (required)
- SQL query
- Testcases:
- No testcase defined.
acs::db::nsdb method list_of_lists (public)
<instance of acs::db::nsdb> list_of_lists [ -dbn dbn ] \
[ -bind bind ] [ -prepare prepare ] qn sqlReturn a Tcl list, where each element consists of a list of the column values corresponding to the values of the tuples returned by the provided SQL query.
- Switches:
- -dbn (optional)
- database identifier
- -bind (optional)
- optional bind variables for the SQL query
- -prepare (optional)
- type information for the bind variables in the prepared statement
- Parameters:
- qn (required)
- name of the SQL query
- sql (required)
- SQL query
- Testcases:
- No testcase defined.
acs::db::nsdbi method list (public)
<instance of acs::db::nsdbi> list [ -dbn dbn ] [ -bind bind ] \
[ -prepare prepare ] qn sqlReturn a Tcl list, where each element contains just the first the column values of the tuples returned by the provided SQL query.
- Switches:
- -dbn (optional)
- database identifier
- -bind (optional)
- optional bind variables for the SQL query
- -prepare (optional)
- not used for NSDBI, providing interface compatibility with NSDB
- Parameters:
- qn (required)
- name of the SQL query
- sql (required)
- SQL query
- Testcases:
- No testcase defined.
acs::db::nsdbi method list_of_lists (public)
<instance of acs::db::nsdbi> list_of_lists [ -dbn dbn ] \
[ -bind bind ] [ -prepare prepare ] qn sqlReturn a Tcl list, where each element consists of a list of the column values corresponding to the values of the tuples returned by the provided SQL query.
- Switches:
- -dbn (optional)
- database identifier
- -bind (optional)
- optional bind variables for the SQL query
- -prepare (optional)
- not used for NSDBI, providing interface compatibility with NSDB
- Parameters:
- qn (required)
- name of the SQL query
- sql (required)
- SQL query
- Testcases:
- No testcase defined.
Content File Source
ad_library { Low level interface for defining the basic classes for the DB interface. @author Gustaf Neumann @creation-date 2022-02-07 } namespace eval ::acs {} namespace eval ::acs::db { # # The details of the communication with the database server # (backend) is determined by the NaviServer/AOLserver database # driver and by the backend, which implies a different SQL dialect # (PostgreSQL or Oracle). # ::nx::Class create ::acs::db::SQL { # # Generic superclass for all SQL dialects. # } ########################################################################## # # PostgreSQL specific methods # ########################################################################## ::nx::Class create ::acs::db::postgresql -superclass ::acs::db::SQL { # # Support class for backend based on PostgreSQL, i.e., the # PostgreSQL dialect of SQL). This class can be used with the # nsdb and the nsdbi drivers of NaviServer. # } ########################################################################## # # Oracle specific methods # ########################################################################## ::nx::Class create ::acs::db::oracle -superclass ::acs::db::SQL { # # Support class for backend based on Oracle, i.e., the Oracle # dialect of SQL).. This class can be used with the nsdb and # the nsdbi drivers of NaviServer. # } ########################################################################## # # Database Driver # # Abstract from the Tcl interface that the drivers are offering to # issue SQL commands and to perform profiling. # ::nx::Class create ::acs::db::Driver { # # Abstract class of the database interface # :property backend :property driver :property {dbn ""} # # Define the "abstract" API (here via protected methods) # :method sets {{-dbn ""} {-bind ""} -prepare qn sql} {} :method 0or1row {{-dbn ""} {-bind ""} -prepare qn sql} {} :method 1row {{-dbn ""} {-bind ""} -prepare qn sql} {} :method get_value {{-dbn ""} {-bind ""} -prepare qn sql {default ""}} {} :method list_of_lists {{-dbn ""} {-bind ""} -prepare qn sql} {} :method list {{-dbn ""} {-bind ""} -prepare qn sql} {} :method dml {{-dbn ""} {-bind ""} -prepare qn sql} {} :method foreach {{-dbn ""} {-bind ""} -prepare qn sql {script}} {} :method row_lock {{-dbn ""} {-bind ""} {-for "UPDATE"} -prepare qn sql} {} :method transaction {{-dbn ""} script args} {} :method ds {onOff} {} :method prepare {-handle {-argtypes ""} sql} {} :public method qn {query_name} { # # Return fully qualified query name as used in OpenACS. # set prefix [expr {[info level] < 2 ? "topLevel" : [:uplevel {info level 0}]}] return "dbqd.$prefix.$query_name" } :method get_sql {{-dbn ""} qn} { set full_statement_name [db_qd_get_fullname $qn 2] set full_query [db_qd_fetch $full_statement_name $dbn] set sql [db_fullquery_get_querytext $full_query] # # todo: missing handling of substitution rules as # introduced with oacs-5-10 # :uplevel 2 [list subst $sql] } :method map_default_dbn {dbn} { return [expr {$dbn eq "" && ${:dbn} ne "" ? ${:dbn} : $dbn}] } } # # Driver specific and Driver/backend specific hooks # ::nx::Class create ::acs::db::nsdb -superclasses ::acs::db::Driver { # # Database interface based on the nsdb driver of NaviServer # } ::nx::Class create ::acs::db::nsdb-postgresql -superclasses {::acs::db::nsdb ::acs::db::postgresql} { # # PostgreSQL backend for nsdb driver # } ::nx::Class create ::acs::db::nsdb-oracle -superclasses {::acs::db::nsdb ::acs::db::oracle} { # # Oracle backend for nsdb driver # } ::nx::Class create ::acs::db::nsdbi -superclasses ::acs::db::Driver { # # Database interface based on the nsdbi driver of NaviServer # } ::nx::Class create ::acs::db::nsdbi-postgresql -superclasses {::acs::db::nsdbi ::acs::db::postgresql} { # # PostgreSQL backend for nsdbi driver # } # # Preliminary list of functions (to be extended/refined) # ::acs::db::nsdb public method list_of_lists {{-dbn ""} {-bind ""} -prepare qn sql} { # # Return a Tcl list, where each element consists of a list of # the column values corresponding to the values of the tuples # returned by the provided SQL query. # # @param dbn database identifier # @param bind optional bind variables for the SQL query # @param prepare type information for the bind variables in the prepared statement # @param qn name of the SQL query # @param sql SQL query # set bindOpt [expr {$bind ne "" ? [list -bind $bind] : ""}] if {$sql eq ""} { set qn [uplevel [list [self] qn $qn]] } return [:uplevel [list ::db_list_of_lists -dbn [:map_default_dbn $dbn] $qn $sql {*}$bindOpt]] } ::acs::db::nsdb public method list {{-dbn ""} {-bind ""} -prepare qn sql} { # # Return a Tcl list, where each element contains just the first # the column values of the tuples returned by the provided SQL query. # # @param dbn database identifier # @param bind optional bind variables for the SQL query # @param prepare type information for the bind variables in the prepared statement # @param qn name of the SQL query # @param sql SQL query # set bindOpt [expr {$bind ne "" ? [list -bind $bind] : ""}] if {$sql eq ""} { set qn [uplevel [list [self] qn $qn]] } uplevel [list ::db_list -dbn [:map_default_dbn $dbn] $qn $sql {*}$bindOpt] } ::acs::db::nsdbi public method list_of_lists {{-dbn ""} {-bind ""} -prepare qn sql} { # # Return a Tcl list, where each element consists of a list of # the column values corresponding to the values of the tuples # returned by the provided SQL query. # # @param dbn database identifier # @param bind optional bind variables for the SQL query # @param prepare not used for NSDBI, providing interface compatibility with NSDB # @param qn name of the SQL query # @param sql SQL query # if {$sql eq ""} { set sql [:get_sql $qn] } set dbn [:map_default_dbn $dbn] return [:uplevel [list ::dbi_rows \ {*}[expr {$dbn ne "" ? [list -db $dbn] : ""}] \ {*}[expr {$bind ne "" ? [list -bind $bind] : ""}] \ -result lists -max 1000000 -- $sql]] } ::acs::db::nsdbi public method list {{-dbn ""} {-bind ""} -prepare qn sql} { # # Return a Tcl list, where each element contains just the first # the column values of the tuples returned by the provided SQL query. # # @param dbn database identifier # @param bind optional bind variables for the SQL query # @param prepare not used for NSDBI, providing interface compatibility with NSDB # @param qn name of the SQL query # @param sql SQL query # if {$sql eq ""} { set sql [:get_sql $qn] } set dbn [:map_default_dbn $dbn] set flat [:uplevel [list ::dbi_rows -columns __columns \ {*}[expr {$dbn ne "" ? [list -db $dbn] : ""}] \ {*}[expr {$bind ne "" ? [list -bind $bind] : ""}] \ -- $sql]] if {[:uplevel {llength $__columns}] > 1} { error "query is returning more than one column" } return $flat } ########################################################################## # # Depending on the configured and available driver, select the SQL # interface. For the time being, we use just a single DB backend # per server and therefore a single database connection object, # namely ::acs::dc (short for database connection). One can # certainly define for multiple backends and drivers multiple such # interface objects. # ########################################################################## d_proc -private ::acs::db::require_dc { {-backend ""} {-driver ""} {-name "::acs::dc"} } { Select the driver based on the specified argument (either DB or DBI) or based on the defaults for the configuration. This function can be used to switch the driver as well dynamically. @param driver "nsdb" or "nsdbi" or empty. When empty, assume "nsdb" unless "preferdbi" is set. @param backend "postgresql" or "oracle" or empty. When empty, determine backed from db_driverkey. @param name of the interface object (defaults to "::acs::dc") @return database interface object } { if {$backend eq ""} { set backend [db_driverkey ""] } if {$driver eq ""} { set driver nsdb if {[info exists ::acs::preferdbi]} { set driver nsdbi } } return [::acs::db::$driver-$backend create $name \ -backend $backend \ -driver $driver { # # Database connection object, configured via # ::acs::db::require_dc. For definiting # connections to multiple databases forover # potentially different drivers, define # multiple database base connection objects. # # the column values corresponding to the values of the tuples # returned by the provided SQL query. # # @see ::acs::db::require_dc # @see Class ::acs::db::nsdb-postgresql # @see Class ::acs::db::nsdb-oracle }] } # # Currently, the call to "::acs::db::require_dc" is performed at # load time before ::ds_collect_db_call is defined. We could # probably define it later. For the time being, we define a dummy # placeolder in case it is not yet defined. # if {[info commands "::ds_collect_db_call"] eq ""} { proc ::ds_collect_db_call args {} } ::acs::db::require_dc } # # Whenever this file is loaded, load as well the dependent # subcomponents. # foreach file [lsort [glob $::acs::rootdir/packages/acs-tcl/tcl/acs-db-1*-procs.tcl]] { ns_log notice "... sourcing dependent: $file" source $file } # Local variables: # mode: tcl # tcl-indent-level: 4 # indent-tabs-mode: nil # End:
