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    3. GroupDocs.Parser Product Family
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    5. GroupDocs.Parser for Java
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    7. Developer Guide
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    9. Advanced Usage
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    11. Extract data from databases

    Extract data from databases

    GroupDocs.Parser provides the functionality to extract data from databases via JDBC.

    Extract data with Connection object

    To create an instance of Parser class to extract data from a database with java.sql.Connection object the following constructor is used:

    Parser(java.sql.Connection connection);
Parser(java.sql.Connection connection, ParserSettings parserSettings);

    The second constructor allows to use ParserSettings object to control the process; for example, by adding logging functionality.

    Here are the steps to extract data from Sqlite database:

    • Prepare java.sql.Connection object;
    • Instantiate Parser object with connection object;
    • Call isText property to check if text extraction is supported;
    • Call isToc property to check if table of contents extraction is supported;
    • Call getToc method and obtain collection of tables;
    • Iterate through the collection and get a text from tables.

    The following example shows how to extract data from Sqlite database:

    // Create DbConnection object
java.sql.Connection connection = java.sql.DriverManager.getConnection(String.format("jdbc:sqlite:%s", Constants.SampleDatabase));
// Create an instance of Parser class to extract tables from the database
try (Parser parser = new Parser(connection)) {
    // Check if text extraction is supported
    if (!parser.getFeatures().isText()) {
        System.out.println("Text extraction isn't supported.");
        return;
    }
    // Check if toc extraction is supported
    if (!parser.getFeatures().isToc()) {
        System.out.println("Toc extraction isn't supported.");
        return;
    }
    // Get a list of tables
    Iterable<TocItem> toc = parser.getToc();
    // Iterate over tables
    for(TocItem i : toc)
    {
        // Print the table name
        System.out.println(i.extractText());
        // Extract a table content as a text
        try(TextReader reader = parser.getText(i.getPageIndex().intValue()))
        {
            System.out.println(reader.readToEnd());
        }
    }
}

    Extract data with connection string

    To create an instance of Parser class to extract data from a database with connection string the following constructor is used:

    Parser(String filePath, LoadOptions loadOptions);

    The list of tables is represented as table of contents. The table extraction is processed by getText method.

    Here are the steps to extract emails from Sqlite database:

    • Prepare connection string;
    • Instantiate Parser object with connection string;
    • Call isText property to check if text extraction is supported;
    • Call isToc property to check if table of contents extraction is supported;
    • Call getToc method and obtain collection of tables;
    • Iterate through the collection and get a text from tables.

    The following example shows how to extract data from Sqlite database:

    String connectionString = String.format("jdbc:sqlite:%s", Constants.SampleDatabase);
// Create an instance of Parser class to extract tables from the database
// As filePath connection parameters are passed; LoadOptions is set to Database file format
try (Parser parser = new Parser(connectionString, new LoadOptions(FileFormat.Database))) {
    // Check if text extraction is supported
    if (!parser.getFeatures().isText()) {
        System.out.println("Text extraction isn't supported.");
        return;
    }
    // Check if toc extraction is supported
    if (!parser.getFeatures().isToc()) {
        System.out.println("Toc extraction isn't supported.");
        return;
    }
    // Get a list of tables
    Iterable<TocItem> toc = parser.getToc();
    // Iterate over tables
    for (TocItem i : toc) {
        // Print the table name
        System.out.println(i.getText());
        // Extract a table content as a text
        try (TextReader reader = parser.getText(i.getPageIndex())) {
            System.out.println(reader.readToEnd());
        }
    }
}

    More resources

    GitHub examples

    You may easily run the code above and see the feature in action in our GitHub examples:

    Free online document parser App

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