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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 ADO.NET.

    Extract data with DbConnection object

    To create an instance of Parser class to extract data from a database with DbConnection object the following constructors are used:

    Parser(DbConnection connection);
Parser(DbConnection 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 DbConnection object;
    • Instantiate Parser object with connection string;
    • Call Features.Text property to check if text extraction is supported;
    • Call Features.Toc 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
DbConnection connection = new SQLiteConnection(string.Format("Data Source={0};Version=3;", Constants.SampleDatabase));
// Create an instance of Parser class to extract tables from the database
using (Parser parser = new Parser(connection))
{
    // Check if text extraction is supported
    if (!parser.Features.Text)
    {
        Console.WriteLine("Text extraction isn't supported.");
        return;
    }
    // Check if toc extraction is supported
    if (!parser.Features.Toc)
    {
        Console.WriteLine("Toc extraction isn't supported.");
        return;
    }
    // Get a list of tables
    IEnumerable<TocItem> toc = parser.GetToc();
    // Iterate over tables
    foreach (TocItem i in toc)
    {
        // Print the table name
        Console.WriteLine(i.Text);
        // Extract a table content as a text
        using (TextReader reader = parser.GetText(i.PageIndex.Value))
        {
            Console.WriteLine(reader.ReadToEnd());
        }
    }
}

    Extract data with connection string

    Warning
    This functionality is supported only in .NET Framework version of GroupDocs.Parser for .NET

    To create an instance of Parser class to extract data from a database with a 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(int) method.

    Here are the steps to extract data from Sqlite database:

    • Prepare connection string;
    • Instantiate Parser object with connection string;
    • Call Features.Text property to check if text extraction is supported;
    • Call Features.Toc 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("Provider=System.Data.Sqlite;Data Source={0};Version=3;", "database.db");
// 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
using (Parser parser = new Parser(connectionString, new LoadOptions(FileFormat.Database)))
{
    // Check if text extraction is supported
    if (!parser.Features.Text)
    {
        Console.WriteLine("Text extraction isn't supported.");
        return;
    }
    // Check if toc extraction is supported
    if (!parser.Features.Toc)
    {
        Console.WriteLine("Toc extraction isn't supported.");
        return;
    }
    // Get a list of tables
    IEnumerable<TocItem> toc = parser.GetToc();
    // Iterate over tables
    foreach (TocItem i in toc)
    {
        // Print the table name
        Console.WriteLine(i.Text);
        // Extract a table content as a text
        using (TextReader reader = parser.GetText(i.PageIndex.Value))
        {
            Console.WriteLine(reader.ReadToEnd());
        }
    }
}

    More resources

    GitHub examples

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

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