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POHow to create hibernate criteria with DISTINCT in this case
 

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  1. POHow to create hibernate criteria with DISTINCT in this case
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    <p>I am using hibernate criteria to create postgres query:</p> <pre><code>criteria.addOrder(Order.asc(property).ignoreCase()).setProjection( Projections.distinct(Projections.property("name"))); </code></pre> <p>which generates sql similar to below:</p> <pre><code>select DISTINCT name from table1 order by lower( name) asc; </code></pre> <p>and when this sql gets executed gives below error:</p> <pre><code>ERROR: for SELECT DISTINCT, ORDER BY expressions must appear in select list </code></pre> <p>I know this is something against the postgres rule, but when i looked into the error, i found that we should not use any function at order by clause. If its used then we need to have two work arounds:</p> <ol> <li><p>use nested select as below:</p> <p><code>select name from (select distinct name from table1) as aliasname order by lower(name) asc;</code></p></li> <li><p>use lower function in both select and order by clause.</p> <p><code>select DISTINCT lower(name) from table1 order by lower(name) asc;</code></p></li> </ol> <p>So for the fix, I will prefer a solution into hibernate side. how to create a criteria such that i can get any of the above two sqls.</p> <ul> <li><p>how to create criteria to get nested select.</p></li> <li><p>how ensure from criteria that the function used in order by must be applied in select also</p> <ul> <li>is ther any better solution on hibernate or DB side (<strong>without using hardcoded sql, createQuery() or HQL</strong>).</li> </ul></li> </ul> <p>thanks for your suggetions in advance.</p>
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    1. USChris Travers
    1. USakhi
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    1. COSeems loosely related to your prior question http://stackoverflow.com/q/16460070/398670 .
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      1. POHow to create hibernate criteria with DISTINCT in this case
      1. USCraig Ringer
    2. COHi Craig, good connect. Agree its related to my prior question. I am trying to make this question simpler to the context by using lower() function instead of my custom_sort function.FYI, i have solved my prior question which was related to calling custom DB function by overriding toString() of Order class. Do you have any suggession tho this problem? thanks
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      1. USakhi
 

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