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Transfer of UDRs between workflows is ideally handled using the Inter Workflow agents. The Database agent approach is useful in case of wanting to change the content of the UDRs. Another use is when wanting to pass on MIM values and merge batches at the same time. In the Inter Workflow agent case, only the MIM values for the first (Header MIMs) and last batch (Trailer and Batch MIMs) are considered. Using the Database agents, MIM values may be mapped into database columns. |
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The database, hosts a table where pending transactions are registered. A pending transaction is an ongoing population of a table by a Database forwarding agent. The pending transaction continues from a Begin Batch to an End Batch. The purpose of this table is for Database collection agents to avoid collecting pending data from the table that a Database forwarding agent is currently distributing to.
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A Database forwarding agent may be configured to target a stored procedure, instead of a table directly. In such cases the user must specifically select the table that the stored procedure will populate (SP Target Table). The reason for that is that the pending transaction table must contain the table name, not the SP name, so that the selected table name in the Database collection agent can be matched.
Exchanging Storable Data
All UDRs have a special field named Storable. This field contains the complete UDR description and all its data. If UDRs, having many fields or a complex structure to be exchanged, it could be suitable to store the content of the Storable field in the database. In that way the table would only need one column. The database type of that column must be a RAW, LONG RAW or a BLOB.
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When the Database collection agent detects a mapping of type To UDR, the selected UDR type is not consulted for what UDR type to create. The information about the UDR type will be found in the data of the column itself. Thus, if the UDR stored in the column is of another type than selected in the Source tab, the type to be distributed by the Database collection agent is the type actually found.
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