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Adds document source to local index. Multi-value, mandatory.
Specifies document source to get documents from when the current index is indexed. There must be at least one source. There may be multiple sources, without any restrictions on the source types: ie. you can pull part of the data from MySQL server, part from PostgreSQL, part from the filesystem using xmlpipe2 wrapper.
However, there are some restrictions on the source data. First, document IDs must be globally unique across all sources. If that condition is not met, you might get unexpected search results. Second, source schemas must be the same in order to be stored within the same index.
No source ID is stored automatically. Therefore, in order to be able to tell what source the matched document came from, you will need to store some additional information yourself. Two typical approaches include:
- mangling document ID and encoding source ID in it:
``` source src1 { sql_query = SELECT id*10+1, ... FROM table1 ... }
source src2 { sql_query = SELECT id*10+2, ... FROM table2 ... } ``` 2. storing source ID simply as an attribute:
``` source src1 { sql_query = SELECT id, 1 AS source_id FROM table1 sql_attr_uint = source_id ... }
source src2 { sql_query = SELECT id, 2 AS source_id FROM table2 sql_attr_uint = source_id ... } ```
Example:
source = srcpart1
source = srcpart2
source = srcpart3
