Example:

Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

// This DATABASE field will run a query on a database, and display the result in a table.
FieldDatabase field = (FieldDatabase) builder.insertField(FieldType.FIELD_DATABASE, true);
field.setFileName(getDatabaseDir() + "Northwind.accdb");
field.setConnection("DSN=MS Access Databases");
field.setQuery("SELECT * FROM [Products]");

Assert.assertEquals(MessageFormat.format(" DATABASE  \\d {0} \\c \"DSN=MS Access Databases\" \\s \"SELECT * FROM [Products]\"", getDatabaseDir().replace("\\", "\\\\") + "Northwind.accdb"),
        field.getFieldCode());

// Insert another DATABASE field with a more complex query that sorts all products in descending order by gross sales.
field = (FieldDatabase) builder.insertField(FieldType.FIELD_DATABASE, true);
field.setFileName(getMyDir() + "Database\\Northwind.accdb");
field.setConnection("DSN=MS Access Databases");
field.setQuery("SELECT [Products].ProductName, FORMAT(SUM([Order Details].UnitPrice * (1 - [Order Details].Discount) * [Order Details].Quantity), 'Currency') AS GrossSales " +
        "FROM([Products] " +
        "LEFT JOIN[Order Details] ON[Products].[ProductID] = [Order Details].[ProductID]) " +
        "GROUP BY[Products].ProductName " +
        "ORDER BY SUM([Order Details].UnitPrice* (1 - [Order Details].Discount) * [Order Details].Quantity) DESC");

// These properties have the same function as LIMIT and TOP clauses.
// Configure them to display only rows 1 to 10 of the query result in the field's table.
field.setFirstRecord("1");
field.setLastRecord("10");

// This property is the index of the format we want to use for our table. The list of table formats is in the "Table AutoFormat..." menu
// that shows up when we create a DATABASE field in Microsoft Word. Index #10 corresponds to the "Colorful 3" format.
field.setTableFormat("10");

// The FormatAttribute property is a string representation of an integer which stores multiple flags.
// We can patrially apply the format which the TableFormat property points to by setting different flags in this property.
// The number we use is the sum of a combination of values corresponding to different aspects of the table style.
// 63 represents 1 (borders) + 2 (shading) + 4 (font) + 8 (color) + 16 (autofit) + 32 (heading rows).
field.setFormatAttributes("63");
field.setInsertHeadings(true);
field.setInsertOnceOnMailMerge(true);

doc.updateFields();
doc.save(getArtifactsDir() + "Field.DATABASE.docx");