Issue Overview: Misinterpretation of CURRENT_TIME in SQLite Queries In SQLite, the CURRENT_TIME keyword is a built-in function that returns the current time in the format HH:MM:SS. This keyword is part of SQLite’s date and time functions, which also include CURRENT_DATE and CURRENT_TIMESTAMP. These functions are designed to provide the current date, time, or timestamp at…
Automated File-Based Updates for SQLite Databases: Core Challenge The central problem revolves around synchronizing a SQLite database with external data files that are updated by a third-party application (acarsserv) without manual intervention. The user’s environment involves multiple servers running acarsserv, a program that processes ACARS/VDLM2 data and writes output to files. These files change frequently,…
Unique Key Insertion Challenges with RETURNING Clause Behavior Issue Overview The core challenge involves implementing an efficient atomic operation to insert or retrieve unique text values in a SQLite lookup table while reliably obtaining the associated primary key. The val_lu table structure (id INTEGER PRIMARY KEY, val TEXT NOT NULL UNIQUE) requires handling duplicate entries…
Floating-Point Calculation Discrepancies in x86-32 GCC-Optimized Code Using Extended Precision Registers The core issue involves unexpected numerical inaccuracies in SQLite’s floating-point operations when compiled for 32-bit x86 targets using GCC with optimization levels ≥O1. This manifests specifically in the dekkerMul2 function, which implements Dekker’s multiplication algorithm for precise floating-point error compensation. Under optimization, the computed…
Issue Overview: Segmentation Fault in FTS5 Custom Auxiliary Function Without Query When working with SQLite’s FTS5 extension, particularly with custom auxiliary functions, a segmentation fault (SEGV) can occur under specific conditions. This issue arises when a custom auxiliary function is invoked on an FTS5 table without a full-text query in the SQL statement. For example,…
Issue Overview: SQLite NuGet Package Fails with Single File Build in .NET 6/7 The core issue revolves around a regression in the SQLite NuGet package Stub.System.Data.SQLite.Core.NetStandard when used in .NET 6 or .NET 7 projects configured to generate a single file output. Specifically, the package version 1.0.118 fails with a System.ArgumentNullException when attempting to establish…
Understanding the Contention Between WAL Checkpointing, VACUUM, and Connection Pooling Issue Overview The SQLITE_LOCKED error arises when a database connection attempts to acquire a lock on a database file that is already held by another process or connection in a conflicting mode. In this scenario, the error occurs during the seeding phase (Step 10) after…
Issue Overview: Schema Prefixes Not Affecting Pragma_Table_Info Results When working with attached databases in SQLite, developers often use schema prefixes to qualify object names (e.g., dbname.tablename) to explicitly reference objects in specific databases. This pattern extends to PRAGMA statements, where schema prefixes are valid syntax (e.g., PRAGMA dbname.table_info(‘example’)). However, a critical inconsistency arises when using…
Understanding the Problem: Time Series Data with NULL Values and Multiple Variables The core issue revolves around efficiently querying a SQLite database that stores time series data with multiple variables, some of which may have unpredictable NULL values at the beginning of the series. The current approach involves looping through each variable in C++ and…
Understanding the Core Calculation Error and Storage Missteps The central issue revolves around attempting to multiply a time duration formatted as HH:MM (e.g., ’05:30′) by a numeric value (e.g., an hourly rate of 11.44) and obtaining an incorrect result due to SQLite’s type conversion rules. The root cause lies in SQLite’s interpretation of the HH:MM…