#28643: Complete the ORM Function Library -------------------------------------+------------------------------------- Reporter: Matthew Pava | Owner: JunyiJ Type: New feature | Status: assigned Component: Database layer | Version: master (models, ORM) | Severity: Normal | Resolution: Keywords: | Triage Stage: Accepted Has patch: 0 | Needs documentation: 0 Needs tests: 0 | Patch needs improvement: 0 Easy pickings: 0 | UI/UX: 0 -------------------------------------+------------------------------------- Description changed by felixxm:
Old description: > I was surprised to learn that we didn't have a StrIndex function until > version 2, and yet we had Substr since at least version 1.8. I wonder > how users were using Substr without also finding a use for StrIndex this > whole time. Anyway, since we seem to be adding these functions one at a > time, why don't we work on trying to get the built-ins implemented in one > sweep instead? > > We may even want to split the documentation page > (https://docs.djangoproject.com/en/dev/ref/models/database-functions/) > into further categories with String functions and Numeric functions. > > This is just a sample checklist. There are probably several more that I > have missed. These functions are available directly out of the box with > PostgreSQL. > > String functions not yet implemented: > ASCII(): Returns numeric value of left-most character > CHR(): Character with the given code. > LEFT(): Returns the leftmost number of characters as specified > LPAD(): Returns the string argument, left-padded with the specified > string > LTRIM(): Removes leading spaces > MD5(): Calculates the MD5 hash of string, returning the result in > hexadecimal > REPEAT(): Repeats a string the specified number of times > REPLACE(): Replaces occurrences of a specified string > REVERSE(): Reverse the characters in a string > RIGHT(): Returns the specified rightmost number of characters > RPAD(): Appends string the specified number of times > RTRIM(): Removes trailing spaces > TRIM(): Removes leading and trailing spaces > > Numeric functions: > ABS(): Returns the absolute value. > ACOS(): Returns the arccosine. > ASIN(): Returns the arcsine. > ATAN(): Returns the arctangent. > ATAN2(): Returns the arctangent of the two variables passed to it. > CEILING(): Returns the smallest integer value that is not less than a > numeric expression > COS(): Returns the cosine expressed in radians. > COT(): Returns the cotangent. > DEGREES(): Returns a numeric expression converted from radians to > degrees. > EXP(): Returns the base of the natural logarithm (e) raised to the power > of a numeric expression. > FLOOR(): Returns the largest integer value that is not greater than a > numeric expression. > LOG(): Returns the natural logarithm of a numeric expression. > MOD(): Returns the remainder of one expression by diving by another > expression. > PI(): Returns the value of pi > POWER(): Returns the value of one expression raised to the power of > another expression > RADIANS(): Returns the value of an expression converted from degrees to > radians. > ROUND(): Returns a numeric expression rounded to an integer. Can be used > to round an expression to a number of decimal points > SIN(): Returns the sine given in radians. > SQRT(): Returns the square root. > TAN(): Returns the tangent expressed in radians. New description: I was surprised to learn that we didn't have a StrIndex function until version 2, and yet we had Substr since at least version 1.8. I wonder how users were using Substr without also finding a use for StrIndex this whole time. Anyway, since we seem to be adding these functions one at a time, why don't we work on trying to get the built-ins implemented in one sweep instead? We may even want to split the documentation page (https://docs.djangoproject.com/en/dev/ref/models/database-functions/) into further categories with String functions and Numeric functions. This is just a sample checklist. There are probably several more that I have missed. These functions are available directly out of the box with PostgreSQL. String functions not yet implemented: ASCII(): Returns numeric value of left-most character CHR(): Character with the given code. LEFT(): Returns the leftmost number of characters as specified LPAD(): Returns the string argument, left-padded with the specified string MD5(): Calculates the MD5 hash of string, returning the result in hexadecimal REPEAT(): Repeats a string the specified number of times REPLACE(): Replaces occurrences of a specified string REVERSE(): Reverse the characters in a string RIGHT(): Returns the specified rightmost number of characters RPAD(): Appends string the specified number of times LTRIM(): Removes leading spaces ([https://github.com/django/django/pull/9220 PR #9220]) RTRIM(): Removes trailing spaces ([https://github.com/django/django/pull/9220 PR #9220]) TRIM(): Removes leading and trailing spaces ([https://github.com/django/django/pull/9220 PR #9220]) Numeric functions: ABS(): Returns the absolute value. ACOS(): Returns the arccosine. ASIN(): Returns the arcsine. ATAN(): Returns the arctangent. ATAN2(): Returns the arctangent of the two variables passed to it. CEILING(): Returns the smallest integer value that is not less than a numeric expression COS(): Returns the cosine expressed in radians. COT(): Returns the cotangent. DEGREES(): Returns a numeric expression converted from radians to degrees. EXP(): Returns the base of the natural logarithm (e) raised to the power of a numeric expression. FLOOR(): Returns the largest integer value that is not greater than a numeric expression. LOG(): Returns the natural logarithm of a numeric expression. MOD(): Returns the remainder of one expression by diving by another expression. PI(): Returns the value of pi POWER(): Returns the value of one expression raised to the power of another expression RADIANS(): Returns the value of an expression converted from degrees to radians. ROUND(): Returns a numeric expression rounded to an integer. Can be used to round an expression to a number of decimal points SIN(): Returns the sine given in radians. SQRT(): Returns the square root. TAN(): Returns the tangent expressed in radians. -- -- Ticket URL: <https://code.djangoproject.com/ticket/28643#comment:8> Django <https://code.djangoproject.com/> The Web framework for perfectionists with deadlines. -- You received this message because you are subscribed to the Google Groups "Django updates" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-updates+unsubscr...@googlegroups.com. To post to this group, send email to django-updates@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-updates/064.7705f70c03da6304a954c21428ee6d3c%40djangoproject.com. For more options, visit https://groups.google.com/d/optout.