Stored procedures (server side)

Overview

Execute specific stored procedures directly for any defined data source using the datasources.sp.<servername>.<storedProcedure>() syntax.

Specific Scope for datasources.sp.<servername>.storedProcedure()##

After enabling stored procedures as outlined in Plot 1, individual procedures can be directly accessed for specific data sources via the syntax datasources.sp.<servername>.<storedProcedure>(). This specific scope allows efficient retrieval and manipulation of data, using Servoy scripting to control execution.

Calling a Stored Procedure

To call a stored procedure:

1. Enable procedures for the database server (see Enabling Stored Procedures in Plot 1).

2. Use code completion to navigate to the desired procedure under datasources.sp.<servername>.<storedProcedureName>().

Example: Calling a specific stored procedure from a defined server

var results = datasources.sp.myserver.calculateInterest(3000, 'USD');

Handling Result Sets

The result of calling a stored procedure is a JSDataSet, which can be processed further. Some practical ways to work with the dataset include:

• Iteration: Use .getValue(row, column) to access each data row returned from the procedure.

• In-Memory Conversion: If required, use Create In-Memory Table from Procedure to store the returned data as a temporary table, useful for session-based calculations or cache-like functionality.

Considerations and Best Practices

• Parameter Handling: Ensure that input parameters match the procedure’s expected data types, especially when working with complex queries.

• Data Lifecycle: In-memory tables created from stored procedures are session-specific, meaning they clear automatically at the end of each session.

• Error Monitoring: Stored procedures may generate exceptions if there are issues within the procedure logic. Verify and handle these in the database for smoother client interactions.

• Performance Optimization: Using stored procedures can reduce network load and offload processing to the database, which can enhance overall performance, especially for batch updates or large data transformations.

Remarks

Stored procedures provide powerful tools for offloading operations to the database server, especially useful for data manipulation that benefits from database processing power rather than client-side execution.

For details on how to use Stored Procedures with Servoy, refer to the Procedures section of this documentation.

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