Metadata Absence in sqlite_schema Despite Successful Table Creation Issue Overview When working with SQLite databases via a JDBC client, users may encounter a scenario where tables are created successfully (e.g., using CREATE TABLE IF NOT EXISTS syntax), but the associated metadata does not appear in the sqlite_schema or sqlite_master system tables. This issue manifests as…
Understanding the Absence of Native Stored Functions and Procedural Logic in SQLite Issue Overview The core issue revolves around the absence of native support for user-defined stored functions and procedures in SQLite, which are commonly available in client-server relational database management systems (RDBMS) like MariaDB, PostgreSQL, or Oracle. Stored functions and procedures allow developers to…
Understanding NOT NULL Constraint Violations During Upsert Operations with unixepoch(‘subsec’) Defaults Issue Overview: Conflicting SQLite Engine Versions and Default Expression Evaluation The core problem arises when attempting to perform an INSERT … ON CONFLICT (upsert) operation on a strict table containing a NOT NULL column with a default value using unixepoch(‘subsec’). The schema definition includes:…
Issue Overview: FTS5 Rows Missing with ORDER BY rowid DESC The core issue revolves around the unexpected behavior of SQLite’s FTS5 (Full-Text Search) virtual table when executing queries involving ORDER BY rowid DESC. Specifically, rows that are successfully returned with ORDER BY rowid ASC or without any ordering clause disappear when the same query is…
Issue Overview: SQLite Crash During Bulk Inserts Due to Heap Corruption When performing bulk inserts into an SQLite database, particularly when dealing with thousands of rows, the application may crash with an EXC_BAD_ACCESS (SIGSEGV) error. This error is indicative of a segmentation fault, which occurs when the program attempts to access a memory location that…
Issue Overview: Parameter Binding in Nested Queries with External Content Tables The core issue revolves around the failure of parameter binding in nested SQL queries when using SQLite’s WASM Object-Oriented (OO) API. Specifically, the problem manifests when attempting to delete records from a table (Item) based on a subquery that references a Full-Text Search (FTS5)…
Issue Overview: json_extract Fails on Single-Quoted JSON Strings Despite json_valid Confirming Validity A common challenge arises when working with SQLite’s JSON functions where json_extract() returns empty results even after json_valid() confirms the JSON is valid. This occurs specifically when handling non-standard JSON strings containing single quotes instead of double quotes. For example: SELECT json_valid(json_quote("{‘a’:’xyz’}")) AS…
Structural Association Between Header Rows and Data Rows in Hierarchical Text Imports Scenario Context: Hierarchical Data with Interleaved Headers and Child Rows The core challenge involves transforming a flat list of imported text lines into a structured hierarchy where each non-header row is explicitly linked to its most recent preceding header row. The source data…
Understanding SQLite Cell-Level Storage and Payload Estimation SQLite is a lightweight, serverless, and self-contained database engine that stores data in a highly optimized format. One of the key aspects of SQLite’s storage mechanism is its use of B-trees for organizing table data. Each row in a table is stored as a "cell" within these B-trees,…
Understanding the Requirement for Auto-Populating File Paths in SQLite-Based Applications The core challenge involves dynamically generating a file path string within an SQLite database column by combining static text with values from another column. In this scenario, the goal is to create a filelocation field that automatically constructs a hyperlink path using three components: A…