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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-11509" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-a98e4518-d0a3-4627-9f49-2da75f3f5877" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11509" style="color: #3b73af; text-decoration: none">HHH-11509</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-11509" style="color: #3b73af; text-decoration: none">Infomix limit handler support for offset</a> </span> </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-a98e4518-d0a3-4627-9f49-2da75f3f5877" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"> Improvement </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.2.7 </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 21/Feb/2017 09:21 AM </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-critical-6215aeec-c14b-47b4-88f3-0ac2aa726404" height="16" width="16" border="0" align="absmiddle" alt="Critical" style="vertical-align: text-bottom"> Critical </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="meleagros" id="email_meleagros" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=meleagros" style="color:#6c797f;; color: #3b73af; text-decoration: none">Meleagros</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">The current Informix limit handler doesn't have an offset support. But Informix does. <br> There is a <b>skip</b> keyword for that. Without offset support a scrollable result will be used. I've identified the scrollable result as a performance problem in my application.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">*select SKIP 10 FIRST 10 FROM table. *</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I've create a custom limit handler below. <br> If required I'll provide a pull request on github and integrate it directly in the InformixDialect.</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>CustomInformixDialect <span class="code-keyword" style="color: #000091">extends</span> InformixDialect {
@Override
<span class="code-keyword" style="color: #000091">public</span> LimitHandler getLimitHandler() {
<span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">new</span> InformixLimitHandler();
}
<span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">final</span> <span class="code-keyword" style="color: #000091">class </span>InformixLimitHandler <span class="code-keyword" style="color: #000091">extends</span> AbstractLimitHandler {
@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> processSql(<span class="code-object" style="color: #910091">String</span> sql, RowSelection selection) {
<span class="code-keyword" style="color: #000091">final</span> <span class="code-object" style="color: #910091">boolean</span> hasOffset = LimitHelper.hasFirstRow(selection);
<span class="code-object" style="color: #910091">String</span> sqlOffset = hasOffset ? <span class="code-quote" style="color: #009100">" SKIP "</span> + selection.getFirstRow() : "";
<span class="code-object" style="color: #910091">String</span> sqlLimit = <span class="code-quote" style="color: #009100">" FIRST "</span> + getMaxOrLimit(selection);
<span class="code-object" style="color: #910091">String</span> sqlOffsetLimit = sqlOffset + sqlLimit;
<span class="code-object" style="color: #910091">String</span> result = <span class="code-keyword" style="color: #000091">new</span> StringBuilder(sql.length() + 10)
.append(sql)
.insert(
sql.toLowerCase(Locale.ROOT).indexOf(<span class="code-quote" style="color: #009100">"select"</span>) + 6,
sqlOffsetLimit)
.toString();
<span class="code-keyword" style="color: #000091">return</span> result;
}
@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">boolean</span> supportsLimit() {
<span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">true</span>;
}
@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">boolean</span> bindLimitParametersFirst() {
<span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">true</span>;
}
@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">boolean</span> useMaxForLimit() {
<span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">true</span>;
}
@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">boolean</span> supportsLimitOffset() {
<span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">true</span>;
}
@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">boolean</span> supportsVariableLimit() {
<span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">false</span>;
}
}
}
</pre>
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