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POSSIS Equality Operator not working as expected
 

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    <p>I have an SSIS package that is hooked into a MySQL database that has a <code>tinyint(1)</code> field which is set to the value <code>4</code> and I'm checking to see if that value is <code>4</code> in the database because it should not change based on the incoming flat file if it is already set to <code>4</code>, but it doesn't seem to be working.</p> <p>It should not be updating the status because the field is set to <code>4</code> but I guess I just don't understand why the expression isn't working. I have tried all the different <code>int</code> types for SSIS and it doesn't matter because it always sets the status to <code>1</code>. Based on a quick google search a <code>tinyint</code> should be an <code>unsigned 1 byte int</code> which is why I am casting it to <code>DT_UI1</code></p> <p>Incoming values from flat file the first being the product and the last being the status</p> <pre><code>"039414","*****","*****","*****","*****","*****","*****","*****"," " </code></pre> <p>Existing value from the database the first being the product and the second being the status</p> <pre><code>039414 4 </code></pre> <p>I handle the status by the following derived column expression, basically if there is no value it should be <code>1</code> otherwise it should be <code>4</code></p> <pre><code>LEN(TRIM(Status)) &gt; 0 ? (DT_UI1)4 : (DT_UI1)1 </code></pre> <p>Here is the derived column expression that I'm using to set the product_status (products_status being the actual field from the database and prod_status the status from the incoming flat file):</p> <pre><code>((DT_UI1)products_status == (DT_UI1)4) || ISNULL(prod_status) ? (DT_UI1)4 : (DT_UI1)prod_status </code></pre> <p>What I'm expecting to happen is a few products should keep their status of <code>4</code> but are being updated to <code>1</code>, does anyone have an idea why?</p> <p><strong>Edit:</strong></p> <p>I tried changing the expression to the following with no success.</p> <pre><code>(DT_UI1)products_status == (DT_UI1)4 || ISNULL(prod_status) ? (DT_UI1)4 : (DT_UI1)prod_status </code></pre> <p>and</p> <pre><code>((DT_UI1)products_status == (DT_UI1)4 || ISNULL(prod_status)) ? (DT_UI1)4 : (DT_UI1)prod_status </code></pre> <p>and just the base test</p> <pre><code>(DT_UI1)products_status == (DT_UI1)4 ? (DT_UI1)4 : (DT_UI1)prod_status </code></pre> <p><strong>Solution:</strong></p> <p>I ended up casting the field in the query to an integer because it was being pulled in as a <code>boolean</code> instead of an <code>int</code></p> <pre><code>CAST(products_status AS SIGNED) </code></pre> <p>Then changed my expression to the following and it worked as expected</p> <pre><code>(products_status == 4 || ISNULL(prod_status)) ? (DT_I4)4 : prod_status </code></pre>
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