After you install the driver, you configure data sources to connect to the database. See Chapter 1 “Quick Start Connect” for an explanation of different types of data sources. The data source contains connection options that allow you to tune the driver for specific performance. If you want to use a data source but need to change some of its values, you can either modify the data source or override its values at connection time through a connection string.
If you choose to use a connection string, you must use specific connection string attributes. See “Using a Connection String” and Table 6-1 for an alphabetical list of driver connection string attributes and their initial default values.
On UNIX and Linux, you must set up the proper ODBC environment before configuring data sources. See “Environment Configuration” for basic setup information and “Environment Variables” for more detail about this procedure.
Data sources for UNIX and Linux are stored in the system information file (by default, odbc.ini). If you have a Motif GUI environment on Linux, you can configure and modify data sources through the DataDirect ODBC Data Source Administrator for Linux (the Linux ODBC Administrator) using a driver Setup dialog box. (See “Configuration Through the Administrator” for a detailed explanation of the Administrator.)
If you do not have a GUI environment, you can configure and modify data sources directly by editing the odbc.ini file and storing default connection values there. See “Configuration Through the System Information (odbc.ini) File” for detailed information about the specific steps necessary to configure a data source.
Table 6-1 lists driver connection string attributes that must be used in the odbc.ini file to set the value of the attributes. Note that only the long name of the attribute can be used in the file. The default listed in the table is the initial default value when the driver is installed.
On Windows, data sources are stored in the Windows Registry. You can configure and modify data sources through the ODBC Administrator using a driver Setup dialog box, as described in this section.
On UNIX and Linux, data sources are stored in the odbc.ini file. On Linux, you can configure and modify data sources through the Linux ODBC Administrator using a driver Setup dialog box, as described in this section.
NOTE: This book shows dialog box images that are specific to Windows. If you are using the drivers in the Linux environment, the dialog box that you see may differ slightly from the Windows version. Windows-only and UNIX-only connection options are specifically noted by icons in the Setup dialog box descriptions.
When the driver is first installed, the values of its connection options are set by default. These values appear on the driver Setup dialog box tabs when you create a new data source. You can change these default values by modifying the data source. In the following procedure, the description of each tab is followed by a table that lists the connection options for that tab and their initial default values. This table links you to a complete description of the options and their connection string attribute equivalents. The connection string attributes are used to override the default values of the data source if you want to change these values at connection time.
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On Windows, start the ODBC Administrator by selecting its icon from the DataDirect Connect program group.
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On Linux, change to the install_dir/tools directory and, at a command prompt, enter:
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where install_dir is the path to the product installation directory.
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User DSN: If you are configuring an existing user data source, select the data source name and click Configure to display the driver Setup dialog box.
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If you are configuring a new user data source, click Add to display a list of installed drivers. Select the driver and click Finish to display the driver Setup dialog box.
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System DSN: If you are configuring an existing system data source, select the data source name and click Configure to display the driver Setup dialog box.
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If you are configuring a new system data source, click Add to display a list of installed drivers. Select the driver and click Finish to display the driver Setup dialog box.
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File DSN: If you are configuring an existing file data source, select the data source file and click Configure to display the driver Setup dialog box.
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If you are configuring a new file data source, click Add to display a list of installed drivers; then, select a driver. Click Advanced if you want to specify attributes; otherwise, click Next to proceed. Specify a name for the data source and click Next. Verify the data source information; then, click Finish to display the driver Setup dialog box.
NOTE: The General tab displays only fields that are required for creating a data source. The fields on all other tabs are optional, unless noted otherwise.
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On this tab, provide values for the options in the following table; then, click Apply. The table provides links to descriptions of the connection options.
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Optionally, click the Advanced tab to specify additional data source settings.
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On this tab, provide values for any of the options in the following table; then, click Apply. The table provides links to descriptions of the connection options.
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IANAAppCodePage
UNIX ONLY |
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Optionally, click the Failover tab to specify failover data source settings.
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See “Using Failover” for a general description of failover and its related connection options.
On this tab, provide values for any of the options in the following table; then, click Apply. The table provides links to descriptions of the connection options.
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At any point during the configuration process, you can click Test Connect to attempt to connect to the data source using the connection options specified in the driver Setup dialog box. A logon dialog box appears (see “Using a Logon Dialog Box” for details). Note that the information you enter in the logon dialog box during a test connect is not saved.
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If the driver can connect, it releases the connection and displays a Connection Established message. Click OK.
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If the driver cannot connect because of an incorrect environment or connection value, it displays an appropriate error message. Click OK.
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NOTE: If you are configuring alternate servers for use with the connection failover feature, be aware that the Test Connect button tests only the primary server, not the alternate servers.
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Click OK or Cancel. If you click OK, the values you have specified become the defaults when you connect to the data source. You can change these defaults by using this procedure to reconfigure your data source. You can override these defaults by connecting to the data source using a connection string with alternate values.
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If you want to use a connection string for connecting to a database, or if your application requires it, you must specify either a DSN (data source name), a File DSN, or a DSN-less connection in the string. The difference is whether you use the DSN=, FILEDSN=, or the DRIVER= keyword in the connection string, as described in the ODBC specification. A DSN or FILEDSN connection string tells the driver where to find the default connection information. Optionally, you may specify attribute=value pairs in the connection string to override the default values stored in the data source.
The DSN-less connection string specifies a driver instead of a data source. All connection information must be entered in the connection string because the information is not stored in a data source.
Table 6-1 lists the long and short names for each attribute, as well as the initial default value when the driver is first installed. You can specify either long or short names in the connection string.
Some ODBC applications display a logon dialog box when you are connecting to a data source. In these cases, the data source name has already been specified.
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In the Host Name field, type the name or IP address of the host machine on which the Informix server resides.
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The IP address can be specified in either IPv4 or IPv6 format, or a combination of the two. See “Using IP Addresses” for details concerning these formats.
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Click OK to complete the logon and to update these values in the Registry.
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