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POObtaining a MySql tables PrimaryKey in C# using OdbcConntion (System.Data.Odbc)
 

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  1. POObtaining a MySql tables PrimaryKey in C# using OdbcConntion (System.Data.Odbc)
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    <p>I am trying to retrieve the Primary Key of a table in a MySQL database using C-Sharp (C#) and running into problem.</p> <p>I looked at the various MetaData collections offered and the corresponding columns, however none of them offer a primary key. The "Tables" and "Indexes" collection seem the most promising. INTERESTINGLY, OdbcConnection.GetSchema() has a PrimaryKey property/method, however there is no case where the PrimaryKey property yields something other than a null.</p> <p>Indexes and Tables really did seem like the obvious choice. Yes, the tables in the database have a primary key and the database works.</p> <p>Here is some code, although for this question none seem really necessary. I chose "Tables" for the purpose of this sample, but one can simply change to "Indexes" (or anything else). Obviously, COLUMN_NAME exists for Tables. I just have that there for whatever, playing.</p> <pre><code>public String GetPrimaryKey(String strTable) { try { String strPrimaryKey = null; String[] strRestricted = new String[4] { null, null, strTable, null }; DataTable oSchema = null; // Make sure that there is a connection. if (ConnectionState.Open != this.m_oConnection.State) this.m_oConnection.Open(); // DATABASE: Get the schema oSchema = this.m_oConnection.GetSchema("Tables", strRestricted); // Extract the information related to the primary column, in the format "{System.Data.DataColumn[0]}" DataColumn[] oPrimaryKeys = oSchema.PrimaryKey; // Extract: Column Names foreach (DataRow oRow in oSchema.Rows) { // Get the column name. String strColumnName = oRow["COLUMN_NAME"].ToString(); } return strPrimaryKey; } catch (Exception ex) { MessageBox.Show(ex.Message); } return null; } </code></pre> <p>In doing my research, I found it interesting that I could not find any posts from anyone using the GetSchema().PrimaryKey property.</p> <p>So how can I identify the primary key?</p> <p>Thanks in advance.</p>
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    1. USSarah Weinberger
    1. USSarah Weinberger
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      1. POObtaining a MySql tables PrimaryKey in C# using OdbcConntion (System.Data.Odbc)
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      1. POObtaining a MySql tables PrimaryKey in C# using OdbcConntion (System.Data.Odbc)
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    1. COArguably because Odbc is deprecated, use the MySqlClient and GetSchema(), along with a procedure call for each Table. http://dev.mysql.com/doc/refman/5.0/en/connector-net-programming-connecting-connection-string.html http://stackoverflow.com/questions/2341278/php-get-primary-key-of-table
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      1. USLloyd
    2. COYour comment was the magic key. I did not know that the old interface was deprecated. Finding the right code was a bit of a challenge, as there is sadly no "COLUMN_NAME" on the Indexes collection or "PRIMRY" on the Columns collections, so I have to go through twice, but still, the new version is far better.
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      1. POObtaining a MySql tables PrimaryKey in C# using OdbcConntion (System.Data.Odbc)
      1. USSarah Weinberger
    3. COyou can answer your own question as a reference for others.
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      1. USLloyd
 

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