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<title>change_column (ActiveRecord::ConnectionAdapters::PostgreSQLAdapter)</title>
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<pre><span class="ruby-comment cmt"># File lib/active_record/connection_adapters/postgresql_adapter.rb, line 857</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">change_column</span>(<span class="ruby-identifier">table_name</span>, <span class="ruby-identifier">column_name</span>, <span class="ruby-identifier">type</span>, <span class="ruby-identifier">options</span> = {})
<span class="ruby-identifier">quoted_table_name</span> = <span class="ruby-identifier">quote_table_name</span>(<span class="ruby-identifier">table_name</span>)
<span class="ruby-keyword kw">begin</span>
<span class="ruby-identifier">execute</span> <span class="ruby-node">"ALTER TABLE #{quoted_table_name} ALTER COLUMN #{quote_column_name(column_name)} TYPE #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}"</span>
<span class="ruby-keyword kw">rescue</span> <span class="ruby-constant">ActiveRecord</span><span class="ruby-operator">::</span><span class="ruby-constant">StatementInvalid</span> =<span class="ruby-operator">></span> <span class="ruby-identifier">e</span>
<span class="ruby-identifier">raise</span> <span class="ruby-identifier">e</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">postgresql_version</span> <span class="ruby-operator">></span> <span class="ruby-value">80000</span>
<span class="ruby-comment cmt"># This is PostgreSQL 7.x, so we have to use a more arcane way of doing it.</span>
<span class="ruby-keyword kw">begin</span>
<span class="ruby-identifier">begin_db_transaction</span>
<span class="ruby-identifier">tmp_column_name</span> = <span class="ruby-node">"#{column_name}_ar_tmp"</span>
<span class="ruby-identifier">add_column</span>(<span class="ruby-identifier">table_name</span>, <span class="ruby-identifier">tmp_column_name</span>, <span class="ruby-identifier">type</span>, <span class="ruby-identifier">options</span>)
<span class="ruby-identifier">execute</span> <span class="ruby-node">"UPDATE #{quoted_table_name} SET #{quote_column_name(tmp_column_name)} = CAST(#{quote_column_name(column_name)} AS #{type_to_sql(type, options[:limit], options[:precision], options[:scale])})"</span>
<span class="ruby-identifier">remove_column</span>(<span class="ruby-identifier">table_name</span>, <span class="ruby-identifier">column_name</span>)
<span class="ruby-identifier">rename_column</span>(<span class="ruby-identifier">table_name</span>, <span class="ruby-identifier">tmp_column_name</span>, <span class="ruby-identifier">column_name</span>)
<span class="ruby-identifier">commit_db_transaction</span>
<span class="ruby-keyword kw">rescue</span>
<span class="ruby-identifier">rollback_db_transaction</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-identifier">change_column_default</span>(<span class="ruby-identifier">table_name</span>, <span class="ruby-identifier">column_name</span>, <span class="ruby-identifier">options</span>[<span class="ruby-identifier">:default</span>]) <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">options_include_default?</span>(<span class="ruby-identifier">options</span>)
<span class="ruby-identifier">change_column_null</span>(<span class="ruby-identifier">table_name</span>, <span class="ruby-identifier">column_name</span>, <span class="ruby-identifier">options</span>[<span class="ruby-identifier">:null</span>], <span class="ruby-identifier">options</span>[<span class="ruby-identifier">:default</span>]) <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">options</span>.<span class="ruby-identifier">key?</span>(<span class="ruby-identifier">:null</span>)
<span class="ruby-keyword kw">end</span></pre>
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distrib
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Mandriva
>
2010.0
>
i586
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media
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contrib-release
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by-pkgid
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d51872cc0e1fdee944d71993f94ac764
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files
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445
