Retrieving SQL Connection Data with JavaScript via C++

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In Microsoft Excel, connect to a database by:

  1. Clicking the Data menu and selecting From Other Sources followed by From SQL Server.
  2. Then select Data followed by Connections.
  3. Use the Connections wizard to connect to the database and create a database query.

Aspose.Cells for JavaScript via C++ provides the Workbook.dataConnections property for retrieving external connections. It returns an array of ExternalConnection objects in the workbook.

If the ExternalConnection object contains SQL connection data, it can be type-cast to a DBConnection object and its properties can be used to retrieve database command, command type, connection description, connection information, credentials, and so on.

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Read Data Connections Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat, Utils } = AsposeCells;
        
        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");

            document.getElementById('runExample').addEventListener('click', async () => {
                const fileInput = document.getElementById('fileInput');
                const resultEl = document.getElementById('result');
                resultEl.innerHTML = '';

                if (!fileInput.files.length) {
                    resultEl.innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
                    return;
                }

                const file = fileInput.files[0];
                const arrayBuffer = await file.arrayBuffer();

                // Instantiate workbook from uploaded file
                const workbook = new Workbook(new Uint8Array(arrayBuffer));

                // Access the external collections
                const connections = workbook.dataConnections;
                const connectionCount = connections.count;

                const out = [];

                let connection = null;

                for (let i = 0; i < connectionCount; i++) {
                    connection = connections.get(i);

                    // Check if the Connection is DBConnection, then retrieve its various properties
                    if (connection.classType === AsposeCells.ExternalConnectionClassType.DBConnection) {

                        const dbConn = connection;

                        // Retrieve DB Connection Command
                        out.push('<p>Command: ' + dbConn.command + '</p>');

                        // Retrieve DB Connection Command Type
                        out.push('<p>Command Type: ' + dbConn.commandType + '</p>');

                        // Retrieve DB Connection Description
                        out.push('<p>Description: ' + dbConn.connectionDescription + '</p>');

                        // Retrieve DB Connection ID
                        out.push('<p>Id: ' + dbConn.id + '</p>');

                        // Retrieve DB Connection Info
                        out.push('<p>Info: ' + dbConn.connectionString + '</p>');

                        // Retrieve DB Connection Credentials
                        out.push('<p>Credentials: ' + dbConn.credentialsMethodType + '</p>');

                        // Retrieve DB Connection Name
                        out.push('<p>Name: ' + dbConn.name + '</p>');

                        // Retrieve DB Connection ODC File
                        out.push('<p>OdcFile: ' + dbConn.odcFile + '</p>');

                        // Retrieve DB Connection Source File
                        out.push('<p>Source file: ' + dbConn.sourceFile + '</p>');

                        // Retrieve DB Connection Type
                        out.push('<p>Type: ' + dbConn.sourceType + '</p>');

                        // Retrieve DB Connection Parameters Collection
                        const paramCollection = dbConn.parameters;
                        const paramCount = paramCollection.count;

                        // Iterate the Parameter Collection
                        if (paramCount > 0) {
                            out.push('<h3>Parameters:</h3>');
                        }
                        for (let j = 0; j < paramCount; j++) {
                            const param = paramCollection.get(j);

                            // Retrieve Parameter Cell Reference
                            out.push('<p>Cell reference: ' + param.cellReference + '</p>');

                            // Retrieve Parameter Name
                            out.push('<p>Parameter name: ' + param.name + '</p>');

                            // Retrieve Parameter Prompt
                            out.push('<p>Prompt: ' + param.prompt + '</p>');

                            // Retrieve Parameter SQL Type
                            out.push('<p>SQL Type: ' + param.sqlType + '</p>');

                            // Retrieve Parameter Type
                            out.push('<p>Param Type: ' + param.type + '</p>');

                            // Retrieve Parameter Value
                            out.push('<p>Param Value: ' + param.value + '</p>');
                        } // End for
                    } // End if
                } // End for

                if (out.length === 0) {
                    resultEl.innerHTML = '<p>No DB connections found in the selected workbook.</p>';
                } else {
                    resultEl.innerHTML = out.join('');
                }
            });
        });
    </script>
</html>