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Kotlin
Exposed — Kotlin-First ORM
JetBrains' Exposed combines a SQL DSL with a lightweight ORM. Either style is fully type-safe; both compile to plain SQL.
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PHP
UPSERT (INSERT ... ON DUPLICATE KEY UPDATE)
A MySQL upsert helper: insert a row, or if a unique key collides, update the same row with the new values. Returns whether the row was inserted (true) or updated (false).
PHP
Cursor-Based Pagination
Cursor (keyset) pagination is faster than OFFSET on large tables — and immune to dupes/skips when rows shift. Pass the last seen ID and direction; get the next page.
PHP
Auto-Reconnect on "MySQL has gone away"
Long-running daemons sometimes lose their MySQL connection mid-run. Wrap your DB calls to retry once after a transient connection-lost error.
Python
Bulk Insert with executemany
Insert many rows in one round-trip using executemany. Orders-of-magnitude faster than a loop of single inserts — and the driver handles batching/parametrization for you.
PHP
PDO Schema Existence Checks
Idempotent helpers to test whether a table, column, or index already exists — handy when writing your own migration runner without an ORM.
Kotlin
Room — Android Database
Room is the official Android persistence library — annotation-driven, compile-time SQL verification, coroutine + Flow integration out of the box.
Python
SQLAlchemy 2.0 — Basic Select
The modern SQLAlchemy 2.0 style: typed Mapped[] columns, the new `select()` API, and Session.scalars() for clean row access. Replaces the legacy Query syntax.
Go
database/sql — Transaction Helper
Wrap your transaction in a function that commits on success and rolls back on error or panic. Drop-in: pass any `func(*sql.Tx) error` and forget about manual cleanup.
PHP
Build WHERE IN with Placeholders
Safely interpolate a variable-length list into a "WHERE col IN (...)" clause. Returns the SQL fragment plus the bound parameters — never concatenate user values into SQL.
PHP
Bulk INSERT in a Single Statement
Insert a list of rows in one round trip by building a multi-VALUES statement with placeholders. Orders-of-magnitude faster than looping single INSERTs.
PHP
PDO Connection with Sensible Defaults
Open a PDO connection with all the options you almost always want: real prepared statements, exceptions on error, associative-array fetch mode, UTF-8 charset.
Go
sql.NullString — Nullable DB Columns
Plain `string` can't represent SQL NULL. Use `sql.NullString` (and its siblings `NullInt64`, `NullBool`, etc.) for columns where NULL is a real value distinct from empty.
Python
sqlite3 with Row Factory + Context
Stdlib sqlite3 is fine for embedded / small workloads. Use `with conn:` for automatic commit/rollback, and a row_factory so you get dicts (or namedtuples) instead of bare tuples.
PHP
Paginated Query Helper
Run a SELECT with LIMIT/OFFSET and also return the total row count, so you can render "Page 3 of 47" UIs. Single function, two round trips.
Kotlin
JDBC with use { } — Auto-Close Connections
Plain JDBC is fine for simple cases. Wrap connections / statements / result sets in `use { }` for guaranteed cleanup even on exceptions.
PHP
PDO Transaction Wrapper
Run a closure inside a transaction. Commits on success, rolls back on any exception, then re-throws so the caller can react. Avoids the bug-prone copy-paste of begin/commit/rollBack.