Difference between revisions of "Kexi/Plugins/Queries/SQL Constants"

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(Date constants)
(Date constants)
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*One or two digits are required for month and day, e.g. #2018-4-15# and #2018-04-1# are both valid dates
 
*One or two digits are required for month and day, e.g. #2018-4-15# and #2018-04-1# are both valid dates
 
*Years encoding is a base subset of ISO 8601:
 
*Years encoding is a base subset of ISO 8601:
**Four or more digits are required for year, e.g. #18-4-15# is invalid date
+
**At least four digits are required for year, e.g. #18-4-15# is invalid date
 +
**If there are more than four digits, "+" prefix is required, e.g. #+123456-12-15#
 
**year >= 0001 means year of Anno Domini, limit is std::numeric_limits<int>::max()
 
**year >= 0001 means year of Anno Domini, limit is std::numeric_limits<int>::max()
 
**by convention 1 BC is labelled +0000 (unlike in QDate where 0 is invalid year)
 
**by convention 1 BC is labelled +0000 (unlike in QDate where 0 is invalid year)

Revision as of 16:35, 17 September 2018

Date constants

(since 3.1.1, Bug #393094)

Grammar - two versions:

  • ISO format (KEXI default, recommended)
#Syyyy-mm-dd#
  • US format (for compatibility, based on MSA default [1])
#mm/dd/Syyyy#
  • S means "-" or "+" or "", see below

Notes:

  • Both formats are not dependent on regional settings on the OS, they are always interpreted the same way
  • One or two digits are required for month and day, e.g. #2018-4-15# and #2018-04-1# are both valid dates
  • Years encoding is a base subset of ISO 8601:
    • At least four digits are required for year, e.g. #18-4-15# is invalid date
    • If there are more than four digits, "+" prefix is required, e.g. #+123456-12-15#
    • year >= 0001 means year of Anno Domini, limit is std::numeric_limits<int>::max()
    • by convention 1 BC is labelled +0000 (unlike in QDate where 0 is invalid year)
    • by convention 2 BC is labelled -0001, 3 BC is labelled -0002, etc. (unlike in QDate where 1 means 1 BC), limit is std::numeric_limits<quint64>::min()
  • MSA's format such as #24 Dec 2014# is not supported.
  • Detailed grammar of VBA for reference: https://msdn.microsoft.com/en-us/library/dn528865.aspx

Time constants

(since 3.1.1, Bug #393094)

Grammar - two versions:

  • Full, 24h mode
#hh:nn:ss# 
  • Full, 12h mode
#hh:nn:ss AM# 
#hh:nn:ss PM# 
  • Short, 24h mode
#hh:nn#
  • Short, 12h mode
#hh:nn AM#
#hh:nn PM#

Notes:

  • One or two digits are required; e.g. both #05:59:01# and #5:59:1# are time literals having the same value
  • AM/PM suffixes are case insensitive

Date/Time constants

(since 3.1.1, Bug #393094)

Grammar:

#{date}{whitespace}{time}#

Where {date} is defined as for Date literals and {time} is defined as for Time literals.

Notes:

  • All notes regarding date and time format also apply to data and time parts of the value

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