SQLITE(3lua) LOCAL SQLITE(3lua)
NAME
sqlite -- access SQLite3 files from Lua
SYNOPSIS
local sqlite = require 'sqlite' err = sqlite.initialize() sqlite.shutdown() db, err = sqlite.open(file [, flags]) version = sqlite.libversion() version = sqlite.libversion_number() id = sqlite.sourceid() err = sqlite.close(db) stmt, err = sqlite.prepare(db, sql) err = sqlite.exec(db, sql) err = sqlite.errcode(db) msg = sqlite.errmsg(db) res = sqlite.get_autocommit(db) res = sqlite.changes(db) err = sqlite.bind(stmt, pidx, value) count = sqlite.bind_parameter_count(stmt) pidx = sqlite.bind_parameter_index(stmt, name) name = sqlite.bind_parameter_name(stmt, pidx) err = sqlite.step(stmt) value = sqlite.column(stmt, cidx) sqlite.reset(stmt) sqlite.clear_bindings(stmt) sqlite.finalize(stmt) name = sqlite.column_name(stmt, cidx) count = sqlite.column_count(stmt)
DESCRIPTION
The sqlite Lua binding provides access to SQLite3 files.
GENERAL FUNCTIONS
err = sqlite.initialize() Initialize the SQLite3 library. Workstation applications using SQLite normally do not need to invoke this function. sqlite.shutdown() Deallocate any resources that were allocated by sqlite.initialize(). Workstation applications using SQLite nor- mally do not need to invoke this function. db, err = sqlite.open(file [, flags]) Open a database, optionally passing flags. When called without flags, the database will be opened for reading and writing and it will be created if it does not yet exist. The following flags are defined: sqlite.OPEN_READONLY The database is opened in read-only mode. If the database does not already exist, an error is returned. sqlite.OPEN_READWRITE The database is opened for reading and writing if possible, or reading only if the file is write protected by the operat- ing system. In either case the database must already exist, otherwise an error is returned. sqlite.OPEN_CREATE The database is opened for reading and writing, and is cre- ated if it does not already exist. version = sqlite.libversion() Return the SQLite3 library version number as a string. version = sqlite.libversion_number() Return the SQLite3 library version number as a number. id = sqlite.sourceid() Return the SQLite3 library source id as a string.
DATABASE FUNCTIONS
Database functions operate on database objects returned by sqlite.open(). err = sqlite.close(db) Close an open database. Like with all remaining database func- tions, this function can also be called using the Lua "colon" syn- tactic sugar as db:close(). stmt, err = sqlite.prepare(db, sql) Return a prepared statement. err = sqlite.exec(db, sql) Directly execute an SQL statement. Be careful when creating SQL on the fly (SQL injection attacks). err = sqlite.errcode(db) Return the numeric error code. msg = sqlite.errmsg(db) Return the error message as a string. res = sqlite.get_autocommit(db) Return the autocommit flag. res = sqlite.changes(db) This function returns the number of database rows that were changed or inserted or deleted by the most recently completed SQL statement on the database.
STATEMENT FUNCTIONS
err = sqlite.bind(stmt, pidx, value) Bind value to the parameter pidx in the prepared statement stmt. count = sqlite.bind_parameter_count(stmt) Return the number of parameters in the prepared statement stmt. pidx = sqlite.bind_parameter_index(stmt, name) Return the parameter index for name in the prepared statement stmt. name = sqlite.bind_parameter_name(stmt, pidx) Return the parameter name for the parameter index pidx in the pre- pared statement stmt. err = sqlite.step(stmt) Execute prepared statement stmt. value = sqlite.column(stmt, cidx) Return the value at column cidx in the prepared statement stmt. sqlite.reset(stmt) The sqlite.reset() function is called to reset a prepared statement object back to its initial state, ready to be re-executed. sqlite.clear_bindings(stmt) Contrary to the intuition of many, sqlite.reset() does not reset the bindings on a prepared statement. Use this routine to reset all host parameters to NULL. sqlite.finalize(stmt) The sqlite.finalize() function is called to delete a prepared statement. name = sqlite.column_name(stmt, cidx) Return the name assigned to a particular column in the result set of a SELECT statement. count = sqlite.column_count(stmt) Return the number of columns in the result set returned by the pre- pared statement stmt. This routine returns 0 if stmt is an SQL statement that does not return data (for example an UPDATE).
ERROR CODES
Most functions return an error code, the following error codes are defined: sqlite.OK Successful result. sqlite.ERROR SQL error or missing database. sqlite.INTERNAL Internal logic error in SQLite. sqlite.PERM Access permission denied. sqlite.ABORT Callback routine requested an abort. sqlite.BUSY The database file is locked. sqlite.LOCKED A table in the database is locked. sqlite.NOMEM Out of memory. sqlite.READONLY Attempt to write a readonly database. sqlite.INTERRUPT Operation terminated by sqlite3_interrupt(). sqlite.IOERR Some kind of disk I/O error occurred. sqlite.CORRUPT The database disk image is malformed. sqlite.NOTFOUND Unknown opcode in sqlite3_file_control(). sqlite.FULL Insertion failed because database is full. sqlite.CANTOPEN Unable to open the database file. sqlite.PROTOCOL Database lock protocol error. sqlite.EMPTY Database is empty. sqlite.SCHEMA The database schema changed. sqlite.TOOBIG String or BLOB exceeds size limit. sqlite.CONSTRAINT Abort due to constraint violation. sqlite.MISMATCH Data type mismatch. sqlite.MISUSE Library used incorrectly. sqlite.NOLFS Uses OS features not supported on host. sqlite.AUTH Authorization denied. sqlite.FORMAT Auxiliary database format error. sqlite.RANGE 2nd parameter to sqlite.bind() out of range. sqlite.NOTADB File opened that is not a database file. sqlite.ROW sqlite.step() has another row ready. sqlite.DONE sqlite.step() has finished executing.
SEE ALSO
lua(1), luac(1), sqlite3(1), intro(3lua)
HISTORY
An sqlite manual appeared in NetBSD 7.0.
AUTHORS
The sqlite Lua binding was written by Marc Balmer <mbalmer@NetBSD.org>. NetBSD 9.2 October 28, 2013 NetBSD 9.2
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