Understanding the SQL Logic Error in SQLite Queries The core issue revolves around an SQL query that works in DB Browser for SQLite but fails in the SQLite shell and when executed through a library. The error message returned is "SQL logic error," which is a generic error indicating that the SQLite engine encountered a…
Issue Overview: Precompiled Binaries Dependency and TCL Extension Compilation Failures The core issue revolves around two interconnected problems: the incompatibility of precompiled SQLite binaries with older versions of the GNU C Library (GLIBC) on Linux, and the failure to compile the TCL Extension for SQLite using the traditional configure and make process. The precompiled binaries…
Bitwise Operators and Their Behavior with SQLite Data Types SQLite is a lightweight, serverless database engine that supports a variety of data types and operators, including bitwise operators. However, the behavior of these operators can be nuanced, especially when applied to non-integer data types such as BLOBs or strings. This post delves into the intricacies…
Understanding Column Count Mismatches and View Import Failures in SQLite Column Count Mismatch When Importing into Tables with Computed Columns The .import command in SQLite’s command-line interface (CLI) is designed to simplify bulk data ingestion from text files into database tables. However, two distinct but related issues arise when using this utility: Column count mismatches…
Understanding the Need to Identify STRICT Tables in SQLite SQLite introduced support for STRICT tables in version 3.37.0 (2021-11-27). A STRICT table enforces rigid type checking for columns, ensuring that values inserted or updated in the table adhere strictly to the declared column types (e.g., INTEGER, TEXT, BLOB). This differs from SQLite’s default behavior of…
Issue Overview: sqlite3_close_v2 Return Values and Their Implications The sqlite3_close_v2 function in SQLite is designed to close a database connection and release associated resources. Unlike its predecessor, sqlite3_close, which can return error codes under certain conditions, sqlite3_close_v2 is documented to always return SQLITE_OK. This behavior is explicitly stated in the SQLite documentation, which contrasts it…
Issue Overview: Manual Locking and Transaction Handling in SQLite SQLite is a lightweight, serverless, and self-contained database engine that is widely used in embedded systems, mobile applications, and small-scale web applications. One of its key features is its support for ACID (Atomicity, Consistency, Isolation, Durability) transactions, which ensures data integrity even in the face of…
Issue Overview: SQLite WASM Fails to Attach Non-Main Databases When working with SQLite in a WebAssembly (WASM) environment, particularly without the Origin Private File System (OPFS), users often encounter issues when attempting to attach or create databases that are not named main. The core problem manifests in two distinct ways: Database Creation and Deserialization Failures:…
Issue Overview: Contradictions Between SQLite Documentation and Source Code Behavior The core issue revolves around whether specific SQLite C API functions designed to retrieve column values from query results can fail due to memory allocation (malloc) errors. The SQLite documentation explicitly states that only a subset of sqlite3_column_* functions—specifically those handling text, BLOB, or byte…
Understanding the Core Performance Anomaly in Coroutine-Driven Queries The problem revolves around SQLite query execution plans unexpectedly scanning the entire Results table via an index range condition (PartId>?) instead of terminating early when using a scalar subquery to filter by PartId. This occurs despite explicit logic in the view (PartResults) and outer queries that should…