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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>TableUsage</title><link rel="stylesheet" type="text/css" href="../../styles/main.css"><script language=JavaScript src="../../javascript/main.js"></script><script language=JavaScript src="../../javascript/prettify.js"></script><script language=JavaScript src="../../javascript/searchdata.js"></script></head><body class="ContentPage" onLoad="NDOnLoad();prettyPrint();"><script language=JavaScript><!--
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<div id=Content><div class="CClass"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="TableUsage"></a>TableUsage</h1><div class=CBody><p>TableUsage determines how tables in a query are used.</p><p>For best results, queries should be from EXPLAIN EXTENDED so all identifiers are fully qualified.&nbsp; Else, some table references may be missed because no effort is made to table-qualify unqualified columns.</p><p>This package uses both QueryParser and SQLParser.&nbsp; The former is used for simple queries, and the latter is used for more complex queries where table usage may be hidden in who-knows-which clause of the SQL statement.</p><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SMain"><td class=SEntry><a href="#TableUsage" >TableUsage</a></td><td class=SDescription>TableUsage determines how tables in a query are used.</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#TableUsage.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#TableUsage.new" id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">new</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#TableUsage.get_table_usage" id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">get_table_usage</a></td><td class=SDescription>Get table usage for each table in the given query.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#TableUsage._get_tables_used_from_query_parser" id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">_get_tables_used_from_query_parser</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#TableUsage._get_tables_used_from_query_struct" id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">_get_tables_used_from_query_struct</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#TableUsage._get_tables_used_in_columns" id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">_get_tables_used_in_columns</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#TableUsage._get_tables_used_in_where" id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">_get_tables_used_in_where</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#TableUsage._get_tables_used_in_set" id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">_get_tables_used_in_set</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#TableUsage._get_real_table_name" id=link8 onMouseOver="ShowTip(event, 'tt8', 'link8')" onMouseOut="HideTip('tt8')">_get_real_table_name</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#TableUsage._qualify_table_name" id=link9 onMouseOver="ShowTip(event, 'tt9', 'link9')" onMouseOut="HideTip('tt9')">_qualify_table_name</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#TableUsage._change_context" id=link10 onMouseOver="ShowTip(event, 'tt10', 'link10')" onMouseOut="HideTip('tt10')">_change_context</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#TableUsage._d" id=link11 onMouseOver="ShowTip(event, 'tt11', 'link11')" onMouseOut="HideTip('tt11')">_d</a></td><td class=SDescription></td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="TableUsage.Functions"></a>Functions</h3></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="TableUsage.new"></a>new</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub new</td></tr></table></blockquote><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>%args</td><td class=CDLDescription>Arguments</td></tr></table><h4 class=CHeading>Required Arguments</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>QueryParser</td><td class=CDLDescription><a href="QueryParser-pm.html#QueryParser" class=LClass id=link12 onMouseOver="ShowTip(event, 'tt12', 'link12')" onMouseOut="HideTip('tt12')">QueryParser</a> object</td></tr><tr><td class=CDLEntry>SQLParser</td><td class=CDLDescription><a href="SQLParser-pm.html#SQLParser" class=LClass id=link13 onMouseOver="ShowTip(event, 'tt13', 'link13')" onMouseOut="HideTip('tt13')">SQLParser</a> object</td></tr></table><h4 class=CHeading>Optional Arguments</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>constant_data_value</td><td class=CDLDescription>Value for constants, default &ldquo;DUAL&rdquo;.</td></tr></table><h4 class=CHeading>Returns</h4><p>TableUsage object</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="TableUsage.get_table_usage"></a>get_table_usage</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub get_table_usage</td></tr></table></blockquote><p>Get table usage for each table in the given query.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>%args</td><td class=CDLDescription>Arguments</td></tr></table><h4 class=CHeading>Required Arguments</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>query</td><td class=CDLDescription>Query string</td></tr></table><h4 class=CHeading>Returns</h4><p>Arrayref of hashrefs, one for each CAT, like: (code start) [ { context =&gt; &lsquo;DELETE&rsquo;, table =&gt; &lsquo;d.t&rsquo;, }, { context =&gt; &lsquo;DELETE&rsquo;, table =&gt; &lsquo;d.t&rsquo;, }, ], (code stop)</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="TableUsage._get_tables_used_from_query_parser"></a>_get_tables_used_from_query_parser</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _get_tables_used_from_query_parser</td></tr></table></blockquote></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="TableUsage._get_tables_used_from_query_struct"></a>_get_tables_used_from_query_struct</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _get_tables_used_from_query_struct</td></tr></table></blockquote></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="TableUsage._get_tables_used_in_columns"></a>_get_tables_used_in_columns</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _get_tables_used_in_columns</td></tr></table></blockquote></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="TableUsage._get_tables_used_in_where"></a>_get_tables_used_in_where</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _get_tables_used_in_where</td></tr></table></blockquote></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="TableUsage._get_tables_used_in_set"></a>_get_tables_used_in_set</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _get_tables_used_in_set</td></tr></table></blockquote></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="TableUsage._get_real_table_name"></a>_get_real_table_name</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _get_real_table_name</td></tr></table></blockquote></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="TableUsage._qualify_table_name"></a>_qualify_table_name</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _qualify_table_name</td></tr></table></blockquote></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="TableUsage._change_context"></a>_change_context</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _change_context</td></tr></table></blockquote></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="TableUsage._d"></a>_d</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _d</td></tr></table></blockquote></div></div></div>
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<div class=CToolTip id="tt1"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub new</td></tr></table></blockquote></div></div><div class=CToolTip id="tt2"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub get_table_usage</td></tr></table></blockquote>Get table usage for each table in the given query.</div></div><div class=CToolTip id="tt3"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _get_tables_used_from_query_parser</td></tr></table></blockquote></div></div><div class=CToolTip id="tt4"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _get_tables_used_from_query_struct</td></tr></table></blockquote></div></div><div class=CToolTip id="tt5"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _get_tables_used_in_columns</td></tr></table></blockquote></div></div><div class=CToolTip id="tt6"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _get_tables_used_in_where</td></tr></table></blockquote></div></div><div class=CToolTip id="tt7"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _get_tables_used_in_set</td></tr></table></blockquote></div></div><div class=CToolTip id="tt8"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _get_real_table_name</td></tr></table></blockquote></div></div><div class=CToolTip id="tt9"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _qualify_table_name</td></tr></table></blockquote></div></div><div class=CToolTip id="tt10"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _change_context</td></tr></table></blockquote></div></div><div class=CToolTip id="tt11"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">sub _d</td></tr></table></blockquote></div></div><div class=CToolTip id="tt12"><div class=CClass>QueryParser extracts parts of SQL statements, like table lists and subqueries. </div></div><div class=CToolTip id="tt13"><div class=CClass>SQLParser parses common MySQL SQL statements into data structures. </div></div><!--END_ND_TOOLTIPS-->
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