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    <td align="right" class="bar"> <!-- InstanceBeginEditable name="Section Title" -->
      <h1>Database Platforms</h1>
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      <p><a href="#tbl">Defining Tables</a></p>
      <p><a href="#col">Defining Columns</a></p>
      <p><a href="#rules">Assembly Rules</a></p>
      <p><a href="#rowid">Omnidex ROWIDs</a></p>
      <p><a href="#access">Defining User Access</a></p>
      <p class="line">&nbsp;</p>
      <p><a href="Supported%20Database%20Platforms.htm">Database Platforms</a></p>
      <p>Relational Databases</p>
      <p><a href="Multiple%20Databases.htm">Multiple Databases</a></p>
      <p><a href="../Omnidex%20Concepts/Features/Redefined%20Rowids.htm">Redefined Rowids</a></p>
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      <h2>Relational Databases</h2>
      <p>For native DBMSs, the DATABASE statement identifies the database by name. 
        Supply the name of the database as it is defined in the DBMS. For example, 
        if you are defining a database named &quot;ORDERS&quot;, you should enter 
        ORDERS for database.</p>
      <p>For Oracle, use the ORACLE_SID or ORA_SID(OpenVMS).</p>
      <p>When OmniAccess uses the DATABASE name to locate files, it assumes that 
        the database resides in the login directory for the process. If the database 
        resides on a different path (device, directory, or MPE group) than the 
        login directory, provide path information using the PHYSICAL attribute.</p>
      <p>Similarly, if you assign a logical name to a database, instead of its 
        defined name, declare a PHYSICAL attribute to direct OmniAccess to the 
        database root file.</p>
      <p class="line">&nbsp;</p>
      <h3><a name="tbl"></a>Defining Tables</h3>
      <p>In a DBMS where tables are defined, supply the defined name of a table 
        from the defined database. No other declarations are required when TABLE 
        is defined as part of a supported DBMS</p>
      <p class="line">&nbsp;</p>
      <h3><a name="col"></a>Defining Columns</h3>
      <p> In a DBMS where columns are defined, you should supply the name of a 
        column from the defined database.</p>
      <p class="line">&nbsp;</p>
      <h3><a name="rules"></a>Assembly Rules</h3>
      <p>You can create virtual columns by specifying SQL assembly rules in a 
        column statement.</p>
      <p>The OMNIDEX environment catalog supports SQL SELECT and SQL INSERT assembly 
        rules as supported by the native data management system. You can use these 
        to represent database expressions, functions, or composite search items. 
        The SQL SELECT rule determines what data is returned when that column 
        is displayed. The SQL INSERT rule determines what data is inserted for 
        that column based on data inserted in other fields for that row.</p>
      <p>The following rules apply:</p>
      <p>Both SELECT and INSERT rules may include native database functions, or 
        any other legal syntax supported by the database. <br>
        Special tokens are supported in these rules which relate to the database, 
        table and column names. The following tokens are supported: <br>
        %d represents the database wherever it appears in the rule string.</p>
      <p>%t represents the table wherever it appears in the rule string.</p>
      <p>%c represents the column wherever it appears in the rule string.</p>
      <p>Tokens can appear multiple times in a single assembly rule. For example: 
        <br>
        '%t,%c+(0.05*%t,%c)'</p>
      <p class="line">&nbsp;</p>
      <h3><a name="rowid"></a>Omnidex ROWIDs</h3>
      <p>If a four-byte integer column in a table contains sequentially ascending 
        unique values, and there is an index installed on it, you can use that 
        column as an Omnidex row ID. To declare a column as an Omnidex row ID, 
        add a USAGE clause after the DATATYPE. The USAGE clause should contain 
        any of the following predicates:</p>
      <p>ROWID designates the column as an Omnidex row ID where unique values 
        are assigned programmatically.</p>
      <p>AUTO ROWID designates the column as an Omnidex row ID where unique values 
        are assigned by the native data management platform.</p>
      <p>The LENGTH of the column must be declared as LENGTH 4.</p>
      <p>The example below shows the CUST_NO column being designated as an Omnidex 
        row ID whose value is programmatically assigned by the RDBMS whenever 
        a new record is added to the table:</p>
      <p>COLUMN CUST_NO DATATYPE INTEGER USAGE ROWID LENGTH 4</p>
      <p>If the Omnidex row ID value is automatically assigned by the native RDBMS, 
        the column definition should look like this:</p>
      <p>COLUMN CUST_NO DATATYPE INTEGER USAGE AUTO ROWID LENGTH 4</p>
      <p class="line">&nbsp;</p>
      <h3><a name="access"></a>Defining User Access</h3>
      <p> If the DBMS requires a user name and password to access tables, you 
        must also declare a USERCLASS. By associating a user class named &quot;DEFAULT&quot; 
        with a USER name and PASSWORD, USERCLASS declares the type of access that 
        all users of the environment catalog have to its database. The USER name 
        and PASSWORD declared in the USERCLASS statement are used to open the 
        declared DATABASE after successfully connecting to the OMNIDEX environment 
        catalog.</p>
      <p>You can override the access defined in the environment catalog by calling 
        oaconnect with the DBUSER option.<br>
      </p>
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