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Temporarily disable auto_now / auto_now_add
.../queries/… Be aware that the update() method is converted directly to an SQL statement. It is a bulk operation for direct updates. It doesn’t run any save() methods on your models, or emit the pre_save or post_save signals (which are a consequence of calling save()), or honor the auto_now field ...
Error Code: 1005. Can't create table '…' (errno: 150)
...ceeds the maximum length of 64 characters.
For more details, refer to: MySQL Error Number 1005 Can’t create table
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ALTER TABLE, set null in not null column, PostgreSQL 9.1
...OLUMN phone DROP NOT NULL;
More details in the manual: http://www.postgresql.org/docs/9.1/static/sql-altertable.html
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Difference between VARCHAR and TEXT in MySQL [duplicate]
When we create a table in MySQL with a VARCHAR column, we have to set the length for it. But for TEXT type we don't have to provide the length.
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What is a columnar database?
...o contrast it with row oriented database.
Row oriented databases (e.g. MS SQL Server and SQLite) are designed to efficiently return data for an entire row. It does it by storing all the columns values of a row together. Row-oriented databases are well-suited for OLTP systems (e.g., retail sales...
How to subtract X days from a date using Java calendar?
...er compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.
Where to obtain the java.time classes?
Java SE 8, Java SE 9, Java SE 10, and later
Built-in.
Part of the standard Java API with a bundled implementation.
Java 9 adds some minor features and fixes.
Java ...
MySQL: Insert record if not exists in table
... if you need to get warning message you can afterwards do mysql> show warnings\G
– fiorentinoing
Oct 20 '16 at 18:59
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How to install Hibernate Tools in Eclipse?
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Step-by-step tutorial :
http://shivasoft.in/blog/sql/myqsl/step-by-step-hibernate-tutorial-using-eclipse-wtp/
Reverse Engineering Approach :
http://www.wikihow.com/Generate-Hibernate-Pojo-Classes-from-DB-Tables
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ipython: print complete history (not just current session)
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Here's the Firefox extension that @larssend found: SQLite Manager
It has a GUI for opening a database file and issuing various sqlite commands from a menu. You get the added bonus of seeing the SQL commands that generated the output. Here's mine for my ipython %history in ~/...
What is ActiveMQ used for - can we apply messaging concept using a Database?
...sumers instead of a consumer having to poll for the new message by doing a SQL query.
This further reduces the latency involved in processing new messages being sent into the system.
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