Retrieving SQL Connection Data with JavaScript via C++
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Aspose.Cells can help you retrieve SQL connection data. This includes any and all data that is required to make a connection to the SQL server, for example, server URL, username, table name, full SQL query, query type, location of the table, and name of the named range associated with it.
In Microsoft Excel, connect to a database by:
- Clicking the Data menu and selecting From Other Sources followed by From SQL Server.
- Then select Data followed by Connections.
- 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>