Development

Compilation Error Due to Missing Type Declaration in WAL Module Issue Overview A compilation error occurs when building SQLite for WebAssembly (WASM) with the –enable-amalgamation=no flag, specifically in the Write-Ahead Logging (WAL) module. The error manifests as: /projects/sqlite/repo/bld/../src/wal.c:747:3: error: must use ‘struct’ tag to refer to type ‘Wal’ 747 | Wal *pWal, /* The WAL…

Issue Overview: Running SQLite3 on Microcontrollers with Limited Resources Running SQLite3 on microcontrollers, such as the Raspberry Pi Pico (RP2040), presents a unique set of challenges due to the constrained resources typical of these devices. The Raspberry Pi Pico, equipped with the RP2040 microcontroller, offers limited RAM (264 KB) and flash storage (2 MB), which…

Understanding the Authorization Callback Mechanism in SQLite The authorization callback in SQLite, set via the sqlite3_set_authorizer function, is a powerful feature that allows developers to control and monitor database operations at a granular level. This callback is invoked during the preparation phase of SQL statements, enabling the application to authorize or deny specific actions such…

Understanding the Core Challenge: Merging Standalone Databases into Executable-Bound Appended Storage The central challenge revolves around integrating a standalone SQLite database file (stored as a separate *.db, *.sqlite, or *.db3 file) into an existing executable file in a way that appends the database to the executable without overwriting its original content. This is distinct from…

Memory Leaks and Heap-Use-After-Free: An Overview Memory leaks and heap-use-after-free vulnerabilities are critical issues that can compromise the stability, performance, and security of SQLite databases. These vulnerabilities arise when memory allocated during the execution of SQLite operations is not properly released or when previously freed memory is accessed again. The consequences of these issues can…

Issue Overview: SQLITE_USE_SEH and SQLITE_OMIT_SEH Misconfiguration in MSVC Compilation When compiling SQLite with Microsoft Visual C++ (MSVC) on Windows, developers often encounter issues related to Structured Exception Handling (SEH). SEH is a Microsoft-specific mechanism for handling hardware and software exceptions, and SQLite provides compile-time options to control its usage. The core issue revolves around the…

Understanding the "Specified Procedure Could Not Be Found" Error in SQLite3 Node Module The error message "The specified procedure could not be found" is a common issue encountered when working with native modules in Node.js, particularly in the context of Electron applications. This error typically arises when the application attempts to load a dynamically linked…

Understanding the Database Locking Error in SQLite WASM with OPFS and WASMFS When working with SQLite in a WebAssembly (WASM) environment, particularly when using the Origin Private File System (OPFS) and WASMFS, developers may encounter a "database is locked" error. This error typically occurs when attempting to execute a CREATE TABLE statement after opening a…

Issue Overview: Undeclared Function Errors When Compiling SQLite with SQLITE_OMIT_TRIGGER When attempting to build SQLite with the SQLITE_OMIT_TRIGGER compile-time option enabled, developers encounter a series of compilation errors related to undeclared functions. The most prominent error is the failure to recognize the function sqlite3DeleteTriggerStep, which results in the following error message: include/sqlite3.c:174980:1: error: call to…

Understanding Append VFS Integration and ATTACH Failures The core issue revolves around using SQLite’s append VFS (Virtual File System) to attach a database appended to an executable file. When attempting to use ATTACH DATABASE with the apndvfs VFS via URI syntax, users encounter errors such as "no such vFS: apndvfs" or "file is not a…