SQLite Database Handle Not Released After sqlite3_close in C# When working with SQLite in C#, particularly when interfacing directly with the SQLite C API via P/Invoke, a common issue arises where the database handle (sqlite3*) is not properly released after calling sqlite3_close. This issue manifests when attempting to rename or delete the database file immediately…
SQLite Binary Fails to Recognize libreadline on Ubuntu 20.04 The core issue revolves around the SQLite binary version 3.31 for Linux failing to recognize the libreadline libraries available on Ubuntu 20.04. This problem manifests when users attempt to use the SQLite command-line interface (CLI) with readline functionality, which is essential for features like command history…
SQLite Speedtest1 Tunables: reprepare and shrink_memory Defaults The SQLite Speedtest1 program is a specialized tool designed to stress-test and benchmark the SQLite database engine. Two of its key tunable parameters, reprepare and shrink_memory, are enabled by default. These parameters are not part of the standard SQLite configuration but are specific to the Speedtest1 program. Their…
SQLite3NestedParse API Returning Empty SQL String During Schema Update The SQLite3NestedParse API is a critical component in SQLite’s internal mechanism for generating and executing SQL statements during schema modifications. When creating or altering tables, SQLite uses this API to construct and parse SQL statements that update the internal schema table (sqlite_master). However, in the context…
Trigger Logic Fails to Prevent Insertion of Insufficient Driving Lesson Minutes The core issue revolves around a SQLite trigger designed to enforce a business rule: a student must have completed at least 180 minutes of practical driving lessons before they can be inserted into the Pruefung table for a practical driving test (Theorie = 0)….
Blob Field Type Disappears When Using CREATE TABLE AS SELECT When working with SQLite, a common task is to create a new table by copying the contents of an existing table. This is often done using the CREATE TABLE newTable AS SELECT * FROM oldTable syntax. However, users may encounter an unexpected behavior where the…
SQLite Error Message Retrieval Challenges in C# Applications When working with SQLite in C# applications, developers often encounter challenges in retrieving descriptive error messages that match the clarity and specificity of those displayed in the SQLite Command Line Interface (CLI). The primary issue revolves around the correct usage of SQLite’s error-handling functions, particularly sqlite3_errmsg, and…
SQLite Metadata Creation Fails Due to Undefined User Functions When creating metadata such as views in SQLite, the database engine performs a validation step to ensure that all referenced objects, including functions, exist at the time of creation. This validation is crucial for maintaining database integrity and preventing runtime errors. However, this behavior can become…
SQLite Compilation Errors Due to Undefined Identifiers in Visual Studio When embedding the SQLite Amalgamation library into a Visual Studio project, developers may encounter a series of compilation errors related to undefined identifiers. These errors often manifest as C2065 (undeclared identifier) or C2039 (not a member of a struct/union) errors, indicating that the compiler cannot…
SQLite 3.34.0 FTS5 Index Corruption During DELETE Operations The issue at hand revolves around SQLite 3.34.0 causing database corruption when executing DELETE operations on FTS5 (Full-Text Search) indexes. This corruption manifests as a "database disk image is malformed" error, specifically when the sqlite3_step function returns SQLITE_CORRUPT. The problem was identified during the execution of the…