How to use java's lucene to search the database

Lucene is a public full-text indexing component. Its goal is to convert data in various formats into Lucene's unique index file format, so that full-text retrieval can be performed through Lucene's high-speed retrieval mechanism.

Your data source can be a relational database, a word, execl, txt document, or an HTML web page. For these data sources, you must read their internal data and encapsulate it into Lucene. document instance, and then let Lucene help you build the index.

For example: You have a user database that stores hundreds of thousands of user information. Now you want to perform full-text indexing on this database, then what you have to do is:

1. Write a traditional JDBC program to read each user information from the database
2. Create a lucene document for each user record
Document doc = new Document();
And according to your needs, add each field of user information corresponding to the field in the luncene document, such as: doc.add(new Field("NAME","USERNAME", Field.Store.YES,Field.Index .UN_TOKENIZED));
Then add the doc to the index, such as: luceneWriter.addDocument(doc);
This establishes the lucene index library
3. Write a search program for the index library (See the Lucene documentation), by searching the Lucene index library, you can quickly find the ID of the corresponding record
4. Find the relevant records in the database through the ID

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