3.5 Connecting Web Server to SAP Server

In order to connect to a SAP ERP system, Liquid UI Web Server needs to know where that server is located. Connection strings specify the SAP ERP system to which the RFC user will connect. Connection strings can be used either to point directly to a SAP ERP system or to point to a back-end system using a message server when load-balancing is being utilized. They can be defined in the config.js file. This is specified by means of connection strings, which are entered into the SAP Router field in a SAP connection. Connection strings can be entered in a variety of formats. These formats are as follows:

/H/[serverName]

This connection string is used when there is a single server to connect to. The value that replaces the [serverName] can be either a GuiXT Server or a SAP application Server. If our server is named 'Coffee', the string would appear as follows.

/H/Coffee

/H/[serverName]/G/[groupName]

This format is used when you are connecting to a single server, but when there are more than one user group on that server. So if we are still using the 'Roast' group on the 'Coffee' server, the connection string would appear as shown below.

/H/Coffee/G/ROAST

[serverName]:[portNumber]

This format is used when you are connecting to a single server and you wish to specify the port that is to be used. So if we are using port number 3600 on the 'Coffee' server, the connection string would appear as shown below.

Coffee:3600

/H/[serverName]/S/[messageServerName]

This format is used when you are connecting to a single server, but when there are more than one user group on that server. So if we are still using the 'Roast' group on the 'Coffee' server, the connection string would appear as shown below.

/H/Coffee/G/ROAST

/H/[serverName]/S/[messageServerName]/G/[groupName]

This format is used when you are connecting to a specific server through a message server and when there are more than one user group on that server. So if we are using a mesasge server called 'Decaf' to connect to our 'Coffee' server and we are in the group 'Roast', the connection string would appear as shown below.

/H/Coffee/S/Decaf/G/Roast

Connection strings can be used either to point directly to a SAP ERP system or to point to a back-end system using a message server when load-balancing is being utilized as shown in the examples above that specify a message server. For more information about load-balancing, please see the Load Balancing section in this document.

If you are using the rfcconnect command, you can use this command to directly enter a connection string. A typical rfcconnect string will look as shown in the following example:

rfcconnect = "SYSNR=00 IFDATABASE=TRX LANG=E CLIENT=800 ASHOST=juneau  SYSNR=00 LCHECK=0 USE_SAPGUI=0 USER=ayam PASSWD=x05y9a787q/rmAYe7CqiUmcsXVyK3N427ummcQ04LPs=" ;

In addition to a single rfcconnect entry, it is also possible to enter an array that contains multiple rfcconnect strings. Such an array would look as in the following example:

rfcconnect = [ "IFDATABASE=GD4 CLIENT=600 ASHOST=HMLUSDA4.SAMPLE.NET SYSNR=00",
"IFDATABASE=GD2 CLIENT=600 ASHOST=SAMPLE4.SAMPLE.NET SYSNR=02",
"IFDATABASE=GT4 CLIENT=600 ASHOST=SAMPLE6.SAMPLE.NET SYSNR=04",
"IFDATABASE=TRX CLIENT=800 ASHOST=SAMPLE1 SYSNR=00",
"IFDATABASE=GT7 CLIENT=600 ASHOST=SAMPLE6.SAMPLE.NET SYSNR=02"];