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POcriteria for left outer join in hibernate
 

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  1. POcriteria for left outer join in hibernate
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    <p>I have two tables named as 'A' and 'B'. Table 'B' primary key is mapped as foreign key in 'A' table as 'b_id'(column name). In table 'A' the primary key of 'B'(b_id) may be null. i.e. In the 'B' table record doesn't exist. Table 'B' will have column 'del_flag'</p> <p>Now i need to select <strong>all rows</strong> from 'A' table(including which are having 'b_id' as null). if <strong>b_id</strong> is not null in table 'A' then i need to check the <strong>'del_flag'</strong> of table 'B' is '0'(zero or not). <strong>i.e</strong> if 'B' record exist i need to display only the records whose 'del_flag' is 0 .</p> <p>How to write the <strong>criteria</strong> for the above condition.</p> <p>I am trying with the following first two conditions. Based on my requirement it should work. </p> <pre><code> criteria.createAlias("b", "m"); -----&gt; (1) criteria.add(Restrictions.or(Restrictions.isNull("b"),Restrictions.eq("m.del_flag", "0"))); ---&gt;(2) //criteria.add(Restrictions.isNull("b")); -----&gt;(3) </code></pre> <p><strong>Let's come to the proble what i am facing.</strong></p> <p>The problem is with the '<strong>creatAlias</strong>'. I changed my requirement to select only which are having <strong>'b_id'</strong> as <strong>null</strong>. I executed only <strong>(1) (3)</strong> conditions (<strong>2 is commented</strong>). I got <strong>empty record</strong>.</p> <p>After struggling some time, i <strong>commented</strong> the condition <strong>(1)</strong> also . Now i <strong>got</strong> the result set.</p> <p>if i execute <strong>(1)</strong> and <strong>(3)</strong> i am getting not getting result set. only <strong>(3)</strong> is giving the result set. </p> <p>I am thinking that <strong>this might be the reason</strong> for my <strong>actual requirement</strong> . </p>
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    1. USDaya
    1. USDaya
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    1. COI had been assuming that you have a entity A with a field, private B b; and entity B with a field, private Object delFlag;
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    2. COyeah. your assumption is right.
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      1. USDaya
 

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