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POIssues with NpgsqlDatareader when trying to integrate Vb.net with PostgreSQL database
 

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  1. POIssues with NpgsqlDatareader when trying to integrate Vb.net with PostgreSQL database
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    <p>So I am fairly new (read just starting) to PostgreSQL and VB.net. I have done research and am using the Npgsql.dll and Mono.Security.Protocol.Tls.dll as references to connect to the database.</p> <h2>|barcode|item|type|received|removed|on_hand|</h2> <h2>|ien0001|thing1|type1| 1 | 2 | 3 |</h2> <h2>|ien0002|thing2|type2| 4 | 5 | 6 |</h2> <h2>|ien0003|thing1|type1| 7 | 8 | 9 |</h2> <p>Example of my table </p> <p>Now the issue that I am having is that when I use myReader.GetString(0) the value being returned is always 0. Now if I hardcode this line to this below I will get the actual value that is in the database. I'm not sure if I am doing something stupid or if I am in over my head. Any advice would be great. I hope the question is clear. If not please let me know and I will try to rephrase. Also this is my first time posting so let me know if my formatting is awful. </p> <p>Thanks </p> <p>Also if I don't hardcode the barcode then (no pun intended) then the if statement is never executed. </p> <p>Also I forgot to mention what I am trying to accomplish. I am trying to query the database using a VB variable called code. Then based on the results of the query (there will only be at most one result) extract a value from a column and save that to another variable.</p> <p>If there is another way of doing this please let me know. Thanks</p> <p>mySQLString = "SELECT On_Hand FROM total_inventory WHERE Barcode = 'ien0002' ;"</p> <pre><code> code = "'ien0001'" 'code is a string myConnection.ConnectionString = "Server=###.###.###.###;Port=####;Database=inventory;User Id=inventory_user;Password=$$$$$$;" myConnection.Open() myCommand = New NpgsqlCommand(mySQLString, myConnection) myCommand.ExecuteNonQuery() myReader = myCommand.ExecuteReader If myReader.Read() Then CurrentQty = CInt(myReader.GetString(0)) MsgBox(":" &amp; CurrentQty) End If myReader.Close() MsgBox(CurrentQty) myConnection.Close() </code></pre>
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    1. This table or related slice is empty.
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    1. USuser2482595
    1. USuser2482595
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POIssues with NpgsqlDatareader when trying to integrate Vb.net with PostgreSQL database
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      1. VTUpMod
    1. COCould you show the sql string when you don't hardcode the value? How do you build the command?
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      1. POIssues with NpgsqlDatareader when trying to integrate Vb.net with PostgreSQL database
      1. USSteve
    2. CONevermind I am a moron, changed the if to a while and that fixed it. thanks, for the quick reply @Steve. When I don't hardcode it the string is [code]mySQLString = "SELECT On_Hand FROM total_inventory WHERE Barcode = " & code & ";"
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      1. USuser2482595
 

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