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POCalling stored procedure from Java / JPA
 

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    <p>I am writing a simple web application to call a stored procedure and retrieve some data. Its a very simple application, which interacts with client's database. We pass employee id and company id and the stored procedure will return employee details.</p> <p>Web application cannot update/delete data and is using SQL Server.</p> <p>I am deploying my web application in Jboss AS. Should I use JPA to access the stored procedure or <code>CallableStatement</code>. Any advantage of using JPA in this case.</p> <p>Also what will be the sql statement to call this stored procedure. I have never used stored procedures before and I am struggling with this one. Google was not much of a help.</p> <p>Here is the stored procedure:</p> <pre><code>CREATE procedure getEmployeeDetails (@employeeId int, @companyId int) as begin select firstName, lastName, gender, address from employee et where et.employeeId = @employeeId and et.companyId = @companyId end </code></pre> <p>Update:</p> <p>For anyone else having problem calling stored procedure using <em>JPA</em>.</p> <pre><code>Query query = em.createNativeQuery("{call getEmployeeDetails(?,?)}", EmployeeDetails.class) .setParameter(1, employeeId) .setParameter(2, companyId); List&lt;EmployeeDetails&gt; result = query.getResultList(); </code></pre> <p>Things I have noticed:</p> <ol> <li>Parameter names didn't work for me, so try using parameter index.</li> <li>Correct sql statement <code>{call sp_name(?,?)}</code> instead of <code>call sp_name(?,?)</code></li> <li>If stored procedure is returning a result set, even if you know with only one row, <code>getSingleResult</code> wont work</li> <li>Pass a <code>resultSetMapping</code> name or result class details</li> </ol>
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    1. COThe curly braces arround the query helped fix it for me.
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    2. COYou cannot use named parameters in *native* queries. Named parameters are supported only for JPQL queries. (If you prefer named parameters, you could write your own class to translate named to numbered parameters.)
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      1. USViliam Búr
 

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