Returns the length of the string str, measured in characters. Returns the length of the string str in bits. ASCII() works for characters with numeric values from 0 to 255. Returns the numeric value of the leftmost character of the string str. Returns the specified rightmost number of charactersĪppends string the specified number of times Replaces occurrences of a specified string Repeats a string the specified number of times Pattern matching using regular expressions
Returns a substring starting from the specified positionĮscapes the argument for use in an SQL statement Returns the string argument, left-padded with the specified string Returns the leftmost number of characters as specified Returns numeric value of left-most character The following table details the important string functions − S. PostgreSQL string functions are used primarily for string manipulation. SET home_point = Cast( 'SRID=4326 POINT(' || Cast($3 as text) || ' ' || Cast($2 as text) || ')' as geometry ). You may then have to cast the concatenated string explicitly to geometry type. It accepts any argument type, doesn't require you to cast to text first. There's also a format function which works a bit like sprintf: you give it a string with some placeholders, and it fills in the parts. Or using Postgres's non-standard :: cast operator, which I find quite readable. However, you'll also need to convert them to text to avoid type mismatch errors. Postgres doesn't do any string interpolation: the string 'SRID=4326 POINT($3 $2)' means literally 'SRID=4326 POINT($3 $2)', but you want it to actually "fill in" the $3 and $2, so it becomes something like 'SRID=4326 POINT(-10.2 42.5)'.Īll you need to do is concatenate the variables and the fixed part of the string, using the || operator (don't forget the space). If I run the command that sets home_point from the command line with valid arguments, it works just fine. I also tried escaping each single quote with another single quote as well as with a backslash but that didn't fix it. I've reviewed the PostgreSQL documentation but didn't find an answer. HINT: "SRID=4326 POINT($3)" <- parse error at position 18 within geometry
#Postgresql string function update#
LINE 6: UPDATE personal_profile SET home_point = 'SRID=4326 POINT($3. When I try to create the functions in the psql console I get the following error: ERROR: parse error - invalid geometry UPDATE profile SET home_point = 'SRID=4326 POINT($3 $2)' WHERE user_id = $1 UPDATE profile SET home_lat = $2 WHERE user_id = $1 UPDATE profile SET home_lon = $3 WHERE user_id = $1 I'm trying to construct a PostgreSQL function that updates the longitude and latitude and sets a PostGIS geometry point using a lat/lon pair for a given user: CREATE OR REPLACE FUNCTION set_user_geom(uid integer, lat double precision, lon double precision)
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