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  • Spring Boot and database testing: production defects

    calendar Jun 17, 2024 · 1 min read
     en java knowledgebase  · spring-boot sql
     ·
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    Spring Boot and database testing: production defects

    Sometimes you need to fix a production defect. To do it, you need to mirror a specific set of data, and do a test to proof the bug and then fix it.


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  • I big data sono passati di moda?

    calendar Feb 10, 2023 · 4 min read
     it lettere-a-mia-figlia  · nosql sql sqlite
     ·
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    Questo articolo, di tal Jordan Tigani, getta una luce oscura sul futuro dei big data. E’ scritto dal CEO di un’azienda che sviluppa un nuovo database OLAP (Online analytical processing) chiamato Duckdb, che e’ open source ed e’ “embedded”, nel senso che si ispira molto al modo di funzionare di SQLite. L’articolo sottolinea come uno degli argomenti piu’ forti dietro la commercializzazione di sistemi BigData (come BigQuery, MongoDB ecc) e cioe’ l’enorme flusso di dati che avrebbe investito alcune aziende, rappresentando sia una opportunita’ che una sfida, non si e’ verificato nonostante queste profezie siano vecchie di dieci anni.


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  • SQLite, again (updated)

    calendar Jun 21, 2021 · 2 min read
     en  · sql sqlite
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    SQLite is slowing becoming a new standard. It is fast, and has a growing number of features.


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  • SQL: One of the most valuable skills - Craig Kerstiens

    calendar Feb 19, 2019 · 2 min read
     en sql  · postgresql sql sqlite
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    I admit it. I suffered from an “algebra narcoleptic syndrome” during my relational database lessons at University (1996 circa).


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  • Outer full and inner SQL joins: you are wellcome

    calendar Aug 27, 2018 · 1 min read
     en sql  · sql
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    For a complete description see https://www.codeproject.com/Articles/33052/Visual-Representation-of-SQL-Joins

    All the Join you want
  • SQLite Oracle Compatibility Layer

    calendar Aug 7, 2018 · 1 min read
     en projects python software-projects sql  · oracle sql sqlite
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    The Sqlite Oracle Compatibility Functions is an experimental compatibility layer for SQLite vs Oracle, written in Python 3.


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  • Removing duplicate rows in PostgreSQL, Oracle and SQLite

    calendar Jun 15, 2017 · 1 min read
     en knowledgebase sql  · evil oracle postgresql sql
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    Removing duplicate rows in PostgreSQL, Oracle and SQLite

    Sometimes you need to remove nasty duplicate on a table, based on a subset of the column. On every big database there is something called “rowid” which can be used to indentify a column in a unique way. On PostgreSQL is called ctid, as we shall see:


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  • ORA-01461: can bind a LONG value only for insert into a LONG column

    calendar Sep 1, 2015 · 1 min read
     en knowledgebase  · bad oracle relax sql
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    ORA-01461: can bind a LONG value only for insert into a LONG column

    Disapprove with me! Disapprove with me!

    Okey, you know Oracle. A very good database, a very old database, a very solid rock. Not famous for its error messages. I have already stumbled upon a misleading error on the old rock.


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  • Oracle Invalid number ORA-01722

    calendar Jul 15, 2013 · 1 min read
     en knowledgebase sql  · bad bug oracle sql
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    Oracle Invalid number ORA-01722

    I stumbled upon a very brain-f**k error on Oracle 10g on these days.

    Context: the following query [sql]SELECT * FROM (
    SELECT TO_NUMBER(CUSTOMER_ID) AS SNDG FROM BAD_CODES_TABLE WHERE
    AND I_LIKE=UPPER(‘STATIC_CONDITION’) AND CUSTOMER_ID NOT LIKE ‘%P%’ ) S WHERE TO_NUMBER(S.SNDG) >2000[/sql] could trigger a Invalid number if CUSTOMER_ID column contains invalid numbers.

    Why?

    Well…if you ask to “explain plan”, you will get something like

    • a table full scan
      • Filter Predicates AND
        • I_LIKE=UPPER('STATIC_CONDITION')
        • TO_NUMBER(S.SNDG) >2000
        • CUSTOMER_ID NOT LIKE '%P%'

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  • Come evitare iniezioni SQL lato DB in SQLServer, Oracle, MySQL

    calendar Dec 2, 2012 · 2 min read
     it sql  · asp c mysql php sql sqlserver
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     Come evitare iniezione SQL: lato SQL Server (SP_EXECUTESQL)

    In generale va evitato nel modo più assoluto la scrittura di query sql diamiche.

    Va evitato cioè  l’uso lato SQL Server di sp_executesql e EXEC


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  • dapper-dot-net - Simple SQL object mapper for SQL Server - Google Project Hosting

    calendar May 15, 2011 · 1 min read
     it sql  · c google hosting net sql
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     Dapper is a single file you can drop in to your project that will extend your IDbConnection interface. [...]

    A key feature of Dapper is performance. The following metrics show how long it takes to execute 500 SELECT statements against a DB and map the data returned to objects.


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  • NoSQL Rocks? We try to understand

    calendar Apr 10, 2011 · 4 min read
     en featured knowledgebase sql  · ideas nosql sql
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    NoSQL Rocks? We try to understand

    At Gioorgi.com we was never a SQL fan. In 2000 we thinked SQL was boring, mostly because sql algebra could be a bit boring. Then we found this book written by one of the father of SQL. Years ago Google and then Facebook popped out with new incredible ideas, for improved and super fast scalability, which eventually turned to the “NoSQL” mantra.

    But NoSQL is a mature technology, or it is only a path traced by the Social company out of there? Let’s explore together…


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  • SQL Server e Python

    calendar Feb 17, 2011 · 1 min read
     it python sql  · python sql sqlserver
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    L’integrazione tra .NET e SQL Server è data per scontata: in questo articolo esploreremo invece  come accedere a SQL Server da Python. Uno dei vantaggi di python è che è un linguaggio molto facile da imparare, con un notevole numero di librerie e un’ottima integrazione multi piattaforma. Oltre a ciò python offre un sistema di installazione rapido delle librerie (come  Ruby e Perl).


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  • SQL Server: meta programmazione e meta descrittori

    calendar Feb 6, 2011 · 2 min read
     it sql  · c sql sqlserver
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    In questo articolo della serie SQL Server, vedremo come creare  in modo dinamico delle istruzione per impostare delle policy di sicurezza. Creeremo da zero una stored procedure chiamata sp_FixOverallGrant che in modo dinamico imposterà i profili di sicurezza per due utenze, una in lettura e scrittura (EBRB0_APP) ed una in sola lettura (EBRB0_USR).


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  • SQLite alter table

    calendar Jul 25, 2010 · 1 min read
     it sql  · cute embedded programming small smart sql sqlite
     ·
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    SQLite is a small, powerful embedded database. A friend of mine started using it about six years ago. Some years ago it comes also on top of  Python 2.5. It is used inside

    • FileMaker Bento: its ultra customized model is based on a big sqllite db
    • DropBox client, to store its internal state
    • iPhone: stores your SMS and also other stuff. It is widely used by apps.
    • Apple Safari uses it for HTML5 storage support
    • Google Gears uses it
    • ...and in a lot of embedded product.

    I was annoyed because until version 3.1.3 SQLite did not provide an alter table syntax but… it is quite easy to emulate it with something like this, even if it required a bit of work:


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