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# Copyright (c) 2003 William Goedicke. All rights reserved. This |
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# program is free software; you can redistribute it and/or modify it |
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# under the same terms as Perl itself. |
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=head1 NAME |
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PeopleSoft - Procedural interface for working with PeopleSoft |
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applications. |
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=head1 SYNOPSIS |
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use PeopleSoft; |
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my $dbh = get_dbh( $username, $password, $SID ); |
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my $tbl_name_aref = get_tbl_names( 'table_name_spec', $dbh); |
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my $tbl_name_aref = where_from( $view_name, $dbh ); |
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if ( is_view($name, $dbh) ) |
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my $count = get_rec_count( $tbl_name, $dbh ); |
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if ( table_exists($tbl_name, $dbh) ) {...} |
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my $metadata_href = get_fld_metadata_href( $tbl_name, $dbh ); |
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=cut |
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use DBI; |
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use strict; |
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use Data::Dumper; |
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package PeopleSoft; |
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use Exporter; |
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use vars qw(@ISA @EXPORT $VERSION); |
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$VERSION = '1.05'; |
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@ISA = qw(Exporter); |
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@EXPORT = qw(get_tbl_names |
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get_dbh |
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get_rec_count |
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is_view |
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table_exists |
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where_from |
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get_fld_metadata_href |
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make_ins_stmt |
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); |
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=head1 DESCRIPTION |
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This module provides a set of simple table query and manipulation |
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functions. |
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The following functions are provided (and exported) by this module: |
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=cut |
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# --------------------------------- get_dbh() |
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=over 3 |
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=item get_dbh($username, $password, $SID) |
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The get_dbh() function will return a database handle (courtesy of |
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DBI/DBD) for use in accessing the database. It returns C if it |
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fails. |
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=back |
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=cut |
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sub get_dbh { |
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my ( $username, $password, $SID ) = @_; |
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my $dbh = DBI->connect( "dbi:Oracle:${SID}", $username, $password, |
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{ PrintError => 1, |
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LongReadLen => 16 * 1024, |
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RaiseError => 0, |
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AutoCommit => 0} |
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) or die $DBI::errstr; |
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return $dbh; |
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} |
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# --------------------------------- |
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=over 3 |
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=item get_table_names('table_name_spec', $dbh) |
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Get all the table names which match I from the |
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database tied to $dbh. I should be in a form |
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appropriate for insertion into a SQL where clause (e.g. 'PS_%'). |
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Returns an empty list if it fails. |
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=back |
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=cut |
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sub get_tbl_names { |
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my ( $name_spec, $dbh ) = @_; |
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my ( @names, @results ); |
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my $sql_cmd = "select table_name from all_tables where table_name like '$name_spec'"; |
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my $sth = $dbh->prepare($sql_cmd); |
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$sth->execute; |
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while ( @results = $sth->fetchrow_array ) { |
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push(@names, @results); |
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} |
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$sth->finish; |
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return \@names; |
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} |
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# --------------------------------- |
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=over 3 |
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=item get_rec_count( $tbl_name, $dbh ); |
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Returns the number of records in a table. |
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=back |
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=cut |
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sub get_rec_count { |
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my ( $tbl_name, $dbh ) = @_; |
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my ( $count, $result ); |
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my $sth = $dbh->prepare("select count(*) from $tbl_name"); |
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if ( defined $sth ) { |
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$sth->execute; |
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while ( ( $result ) = $sth->fetchrow_array ) { |
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$count = $result; |
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} |
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} |
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$sth->finish; |
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return $count; |
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} |
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# --------------------------------- |
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=over 3 |
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=item tbl_exists( $tbl_name, $dbh ) |
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Tests for the existence of I<$tbl_name>. If the table exists 1 is |
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returned otherwise 0 is returned. Typical use would be: |
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if( tbl_exists($tbl_a, $dbh_a) and tbl_exists($tbl_b, $dbh_b) ) {...} |
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=back |
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=cut |
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sub tbl_exists { |
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my ( $tbl_name, $dbh ) = @_; |
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my ( @results ); |
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my $sql_cmd = "select table_name from all_tables where table_name like '$tbl_name'"; |
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my $sth = $dbh->prepare($sql_cmd); |
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$sth->execute; |
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while ( @results = $sth->fetchrow_array ) { |
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if ( length(@results) == 0 ) { return 0; } |
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else { return 1; } |
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} |
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} |
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# --------------------------------- Query the database and return metadata hashref |
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164
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=over 3 |
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=item get_fld_metadata_href( $tbl_name, $dbh ) |
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168
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This function returns a reference to a hash keyed by field name. For |
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every field in I<$tbl_name> the hash contains attributes for: data |
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type, precision and nullable. Typical use would be: |
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$metadata = get_fld_metadata_href( $tbl, $dbh ); |
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foreach my $field ( keys( %{$metadata} ) ) { |
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print "Field $field has data type $$metadata{$field}->{TYPE}\n"; |
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print "Field $field has size $$metadata{$field}->{PRECISION}\n"; |
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if ( $$metadata{$field}->{NULLABLE} ) { print "Field $field accepts nulls\n"; |
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} |
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=back |
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=cut |
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sub get_fld_metadata_href { |
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my ( $tbl_name, $dbh ) = @_; |
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my ($nullable, $field, $metadata, %TYPES, $desc); |
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my $i = -10; |
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foreach $desc ( qw(WLONGVARCHAR WVARCHAR WCHAR BIT TINYINT BIGINT |
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LONGVARBINARY VARBINARY BINARY LONGVARCHAR |
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NA CHAR NUMERIC DECIMAL INTEGER SMALLINT FLOAT |
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REAL DOUBLE DATE TIME TIMESTAMP VARCHAR) ) { |
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$TYPES{$i++} = $desc; |
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} |
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195
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0
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my $sql_cmd = "select * from $tbl_name where ROWNUM = 1"; |
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197
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my $sth = $dbh->prepare($sql_cmd); |
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$sth->execute(); |
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200
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for ( my $i=0; $i < $sth->{NUM_OF_FIELDS}; $i++ ) { |
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if ( $sth->{NULLABLE}->[$i] != 1 ) { |
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$nullable = 0; |
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} else { |
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$nullable = 1; |
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} |
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my $field = $sth->{NAME}->[$i]; |
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$$metadata{$field}->{TYPE} = $TYPES{$sth->{TYPE}->[$i]}; |
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$$metadata{$field}->{NULLABLE} = $nullable; |
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$$metadata{$field}->{PRECISION} = $sth->{PRECISION}->[$i]; |
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} |
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$sth->finish(); |
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return $metadata; |
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} |
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# ---------------------------------------------------- print_insert_statement |
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216
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=over 3 |
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218
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=item make_ins_stmt($src_md_href,$dest_md_href,$tbl,$src_data_href) |
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220
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This function returns a SQL insert statement. It is used to migrate |
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data between tables with "slightly" different table structures. This |
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is accomplished by inserting only data for fields that have the same |
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name and data type. It then creates default values for not-nullable |
224
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fields in the destinition table that otherwise would not get values. |
225
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This is particularly useful in migrating data to different versions of |
226
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PeopleSoft applications. |
227
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228
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Typical usage is: |
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230
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231
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$src_md_href = get_fld_metadata_href( $tbl, $src_dbh ); |
232
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$dest_md_href = get_fld_metadata_href( $tbl, $dest_dbh ); |
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234
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while( $data_href = $sth->fetchrow_hashref ) { |
235
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$insert_sql_script .= make_ins_stmt($src_md_href, $dest_md_href, $tbl, $data_href); |
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$insert_sql_script .= "\n"; |
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} |
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239
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=back |
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241
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=cut |
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243
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sub make_ins_stmt { |
244
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0
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0
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1
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my ( $src_fld_metadata_href, $dest_fld_metadata_href, $dest_tbl_name, $src_data_href ) = @_; |
245
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0
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my ( $name, @fnames, @dvals, $ins_stmt, %seen ); |
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247
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0
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my %src_metadata = %{$src_fld_metadata_href}; |
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248
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0
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my %dest_metadata = %{$dest_fld_metadata_href}; |
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249
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0
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my %src_data = %{$src_data_href}; |
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0
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250
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251
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0
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my @all_fields = grep { ! $seen{$_} ++ } ( keys(%src_metadata), keys(%dest_metadata) ); |
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0
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252
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253
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0
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$ins_stmt = "insert into $dest_tbl_name ("; |
254
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0
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foreach $name ( @all_fields ) { |
255
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0
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0
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if ( ! defined $dest_metadata{$name}->{TYPE} ) { next; } |
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0
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256
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0
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push @fnames, $name; |
257
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} |
258
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0
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$ins_stmt .= join ",", @fnames; |
259
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0
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$ins_stmt .= ") values ("; |
260
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0
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foreach $name ( @fnames ) { |
261
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0
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0
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if ( ! defined $src_metadata{$name}->{TYPE} ) { |
262
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0
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0
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0
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if ( $dest_metadata{$name}->{TYPE} =~ /DATE/ ) { |
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0
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0
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0
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0
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0
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0
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0
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263
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0
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push @dvals, "'01-JAN-00'"; |
264
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} |
265
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elsif ( $dest_metadata{$name}->{TYPE} =~ /CHAR/ ) { |
266
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0
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push @dvals, "' '"; |
267
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} |
268
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elsif ( $dest_metadata{$name}->{TYPE} =~ /BIN/ or |
269
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$dest_metadata{$name}->{TYPE} =~ /INT/ or |
270
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$dest_metadata{$name}->{TYPE} =~ /FLOAT/ or |
271
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$dest_metadata{$name}->{TYPE} =~ /NUMERIC/ or |
272
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$dest_metadata{$name}->{TYPE} =~ /DECIMAL/ or |
273
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$dest_metadata{$name}->{TYPE} =~ /REAL/ or |
274
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$dest_metadata{$name}->{TYPE} =~ /DOUBLE/ ) { |
275
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0
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push @dvals, 0; |
276
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} |
277
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else { |
278
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0
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print "Uh oh! I didn't recognize the field type $dest_metadata{$name}->{TYPE}.\n"; |
279
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0
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print "You'ld best add it to the print_insert_statment function.\n"; |
280
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} |
281
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} |
282
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else { |
283
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0
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0
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0
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if ( $dest_metadata{$name}->{TYPE} =~ /DATE/ ) { |
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0
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0
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0
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0
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0
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0
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0
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284
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0
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push @dvals, "'$src_data{$name}'"; |
285
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} |
286
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elsif ( $dest_metadata{$name}->{TYPE} =~ /CHAR/ ) { |
287
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0
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|
push @dvals, "'$src_data{$name}'"; |
288
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} |
289
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elsif ( $dest_metadata{$name}->{TYPE} =~ /BIN/ or |
290
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$dest_metadata{$name}->{TYPE} =~ /INT/ or |
291
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$dest_metadata{$name}->{TYPE} =~ /FLOAT/ or |
292
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$dest_metadata{$name}->{TYPE} =~ /NUMERIC/ or |
293
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$dest_metadata{$name}->{TYPE} =~ /DECIMAL/ or |
294
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$dest_metadata{$name}->{TYPE} =~ /REAL/ or |
295
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$dest_metadata{$name}->{TYPE} =~ /DOUBLE/ ) { |
296
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0
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|
push @dvals, $src_data{$name}; |
297
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} |
298
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else { |
299
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0
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|
print "Uh oh! I didn't recognize the field type of $name.\n"; |
300
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0
|
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|
|
print "You'ld best add it to the print_insert_statment function.\n"; |
301
|
|
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|
|
} |
302
|
|
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|
} |
303
|
|
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|
|
|
} |
304
|
0
|
|
|
|
|
|
$ins_stmt .= join ",", @dvals; |
305
|
0
|
|
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|
|
$ins_stmt .= ")"; |
306
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|
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307
|
0
|
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|
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|
return $ins_stmt; |
308
|
|
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|
|
} |
309
|
|
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|
|
|
#----------------------------------------------------------------- |
310
|
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311
|
|
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|
|
=over 3 |
312
|
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313
|
|
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|
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|
|
=item where_from($view_name, $dbh) |
314
|
|
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|
|
|
|
|
315
|
|
|
|
|
|
|
This function returns a reference to an array of the names of all the |
316
|
|
|
|
|
|
|
tables which are used to create the view. This is useful when |
317
|
|
|
|
|
|
|
deriving table loading sequences. |
318
|
|
|
|
|
|
|
|
319
|
|
|
|
|
|
|
=back |
320
|
|
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|
|
|
|
|
321
|
|
|
|
|
|
|
=cut |
322
|
|
|
|
|
|
|
|
323
|
|
|
|
|
|
|
sub where_from { |
324
|
1
|
|
|
1
|
|
8
|
use Data::Dumper; |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
301
|
|
325
|
0
|
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0
|
1
|
|
my ( $view_name, $dbh ) = @_; |
326
|
0
|
|
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|
|
|
my ( $sql_text, @results, %utabs, @tabs, @t2, @all_tabs, %ah ); |
327
|
|
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|
|
|
|
|
328
|
0
|
|
|
|
|
|
my $sql_cmd = "select text from all_views where view_name = '$view_name'"; |
329
|
0
|
|
|
|
|
|
my $sth = $dbh->prepare($sql_cmd); |
330
|
0
|
|
|
|
|
|
$sth->execute; |
331
|
0
|
|
|
|
|
|
while( @results = $sth->fetchrow_array ) { |
332
|
0
|
|
|
|
|
|
$sql_text .= $results[0]; |
333
|
|
|
|
|
|
|
} |
334
|
0
|
|
|
|
|
|
@tabs = $sql_text =~ |
335
|
|
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|
|
m/# -- required part: |
336
|
|
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|
|
|
|
\s+FROM\s+ |
337
|
|
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|
|
|
\w+ # table name |
338
|
|
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|
|
\s* # normal space after the table name |
339
|
|
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|
|
# -- optional part: |
340
|
|
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|
|
|
|
(?:\w+)? # table abbrv |
341
|
|
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|
|
|
# -- and any number of: |
342
|
|
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|
|
(?:\s*,\s*\w+ # a comma and table name, with optional space. |
343
|
|
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|
|
|
|
(?:\s*\w+)?)* # optional space, optional table abbrv. |
344
|
|
|
|
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|
|
/xg; |
345
|
|
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|
|
|
|
|
346
|
0
|
|
|
|
|
|
foreach ( @tabs ) { |
347
|
0
|
|
|
|
|
|
@t2 = $_ =~ |
348
|
|
|
|
|
|
|
m/ |
349
|
|
|
|
|
|
|
\s* (?:FROM|,) \s* (\w+) (?:\s+\w+)*/xg; |
350
|
0
|
|
|
|
|
|
foreach ( @t2 ) { |
351
|
0
|
|
|
|
|
|
$ah{$_} = ''; |
352
|
|
|
|
|
|
|
} |
353
|
|
|
|
|
|
|
} |
354
|
|
|
|
|
|
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|
355
|
0
|
|
|
|
|
|
push @all_tabs, keys(%ah); |
356
|
|
|
|
|
|
|
|
357
|
0
|
|
|
|
|
|
return \@all_tabs; |
358
|
|
|
|
|
|
|
} |
359
|
|
|
|
|
|
|
#----------------------------------------------------------------- |
360
|
|
|
|
|
|
|
|
361
|
|
|
|
|
|
|
=over 3 |
362
|
|
|
|
|
|
|
|
363
|
|
|
|
|
|
|
=item is_view($name, $dbh) |
364
|
|
|
|
|
|
|
|
365
|
|
|
|
|
|
|
This function returns true (i.e. 1) if the given name is the name |
366
|
|
|
|
|
|
|
of a view in the $dbh. |
367
|
|
|
|
|
|
|
|
368
|
|
|
|
|
|
|
=back |
369
|
|
|
|
|
|
|
|
370
|
|
|
|
|
|
|
=cut |
371
|
|
|
|
|
|
|
|
372
|
|
|
|
|
|
|
sub is_view { |
373
|
1
|
|
|
1
|
|
6
|
use Data::Dumper; |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
149
|
|
374
|
0
|
|
|
0
|
1
|
|
my ( $name, $dbh ) = @_; |
375
|
0
|
|
|
|
|
|
my ( $sql_text, @results, %utabs, @tabs, @t2, @all_tabs, %ah ); |
376
|
|
|
|
|
|
|
|
377
|
0
|
|
|
|
|
|
my $sql_cmd = "select view_name from all_views where view_name = '$name'"; |
378
|
0
|
|
|
|
|
|
my $sth = $dbh->prepare($sql_cmd); |
379
|
0
|
|
|
|
|
|
$sth->execute; |
380
|
0
|
|
|
|
|
|
while( @results = $sth->fetchrow_array ) { |
381
|
0
|
|
|
|
|
|
return 1; |
382
|
|
|
|
|
|
|
} |
383
|
|
|
|
|
|
|
|
384
|
0
|
|
|
|
|
|
return undef; |
385
|
|
|
|
|
|
|
} |