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Software-update: SQLite 3.27.1

SQLite logo (80 pix) SQLite is een in C ontwikkeld databasesysteem dat als database voor onder meer websites en embedded applicaties is te gebruiken. Volgens de ontwikkelaars heeft SQLite geen installatie en administratie nodig, ondersteunt het databases tot een omvang van twee terabyte en wordt een volledige database in één bestand opgeslagen. Verder ondersteunt het bijna de volledige SQL92-specificatie en is het eenvoudig via onder andere Tcl/Tk aan te sturen. De ontwikkelaar heeft versie 3.27.1 met de volgende lijst aanpassingen de deur uit gedaan:

SQLite Release 3.27.1
  • Fix a bug in the query optimizer: an adverse interaction between the OR optimization and the optimization that tries to use values read directly from an expression index instead of recomputing the expression.
Changes carried forward from version 3.27.0
  • Added the VACUUM INTO command
  • Issue an SQLITE_WARNING message on the error log if a double-quoted string literal is used.
  • The sqlite3_normalized_sql() interface works on any prepared statement created using sqlite3_prepare_v2() or sqlite3_prepare_v3(). It is no longer necessary to use sqlite3_prepare_v3() with SQLITE_PREPARE_NORMALIZE in order to use sqlite3_normalized_sql().
  • Added the remove_diacritics=2 option to FTS3 and FTS5.
  • Added the SQLITE_PREPARE_NO_VTAB option to sqlite3_prepare_v3(). Use that option to prevent circular references to shadow tables from causing resource leaks.
  • Enhancements to the sqlite3_deserialize() interface:
    • Add the SQLITE_FCNTL_SIZE_LIMIT file-control for setting an upper bound on the size of the in-memory database created by sqlite3_deserialize. The default upper bound is 1GiB, or whatever alternative value is specified by sqlite3_config(SQLITE_CONFIG_MEMDB_MAXSIZE) and/or SQLITE_MEMDB_DEFAULT_MAXSIZE.
    • Honor the SQLITE_DESERIALIZE_READONLY flag, which was previously described in the documentation, but was previously a no-op.
    • Enhance the "deserialize" command of the TCL Interface to give it new "--maxsize N" and "--readonly BOOLEAN" options.
  • Enhancements to the CLI, mostly to support testing and debugging of the SQLite library itself:
    • Add support for ".open --hexdb". The "dbtotxt" utility program used to generate the text for the "hexdb" is added to the source tree.
    • Add support for the "--maxsize N" option on ".open --deserialize".
    • Add the "--memtrace" command-line option, to show all memory allocations and deallocations.
    • Add the ".eqp trace" option on builds with SQLITE_DEBUG, to enable bytecode program listing with indentation and PRAGMA vdbe_trace all in one step.
    • Add the ".progress" command for accessing the sqlite3_progress_handler() interface.
    • Add the "--async" option to the ".backup" command.
    • Add options "--expanded", "--normalized", "--plain", "--profile", "--row", "--stmt", and "--close" to the ".trace" command.
  • Increased robustness against malicious SQL that is run against a maliciously corrupted database.
Bug fixes:
  • Do not use a partial index to do a table scan on an IN operator.
  • Fix the query flattener so that it works on queries that contain subqueries that use window functions.
  • Ensure that ALTER TABLE modifies table and column names embedded in WITH clauses that are part of views and triggers.
  • Fix a parser bug that prevented the use of parentheses around table-valued functions.
  • Fix a problem with the OR optimization on indexes on expressions.
  • Fix a problem with the LEFT JOIN strength reduction optimization in which the optimization was being applied inappropriately due to an IS NOT NULL operator.
  • Fix the REPLACE command so that it is no longer able to sneak a NULL value into a NOT NULL column even if the NOT NULL column has a default value of NULL.
  • Fix a problem with the use of window functions used within correlated subqueries.
  • Fix the ALTER TABLE RENAME COLUMN command so that it works for tables that have redundant UNIQUE constraints.
  • Fix a bug that caused zeroblob values to be truncated when inserted into a table that uses an expression index.
Versienummer 3.27.1
Releasestatus Final
Besturingssystemen Windows 7, Android, Linux, BSD, macOS, Solaris, UNIX, Windows Server 2012, Windows 8, Windows 10, Windows Server 2016
Website SQLite
Download https://www.sqlite.org/download.html
Licentietype GPL

Door Japke Rosink

Meukposter

19-02-2019 • 10:08

0 Linkedin Google+

Bron: SQLite

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