Squeal.PostgreSQL.Expression.Json

Json and Jsonb functions and operators

Json and Jsonb operators

(.->) :: (json `In` PGJsonType, key `In` PGJsonKey) => Operator (null json) (null key) (Null json) infixl 8

Get JSON value (object field or array element) at a key.

(.->>) :: (json `In` PGJsonType, key `In` PGJsonKey) => Operator (null json) (null key) (Null PGtext) infixl 8

Get JSON value (object field or array element) at a key, as text.

(.#>) :: json `In` PGJsonType => Operator (null json) (null (PGvararray (NotNull PGtext))) (Null json) infixl 8

Get JSON value at a specified path.

(.#>>) :: json `In` PGJsonType => Operator (null json) (null (PGvararray (NotNull PGtext))) (Null PGtext) infixl 8

Get JSON value at a specified path as text.

Jsonb operators

(.?) :: Operator (null PGjsonb) (null PGtext) (Null PGbool) infixl 9

Does the string exist as a top-level key within the JSON value?

(.?|) :: Operator (null PGjsonb) (null (PGvararray (NotNull PGtext))) (Null PGbool) infixl 9

Do any of these array strings exist as top-level keys?

(.?&) :: Operator (null PGjsonb) (null (PGvararray (NotNull PGtext))) (Null PGbool) infixl 9

Do all of these array strings exist as top-level keys?

(.-.) :: key `In` '[PGtext, PGvararray (NotNull PGtext), PGint4, PGint2] => Operator (null PGjsonb) (null key) (null PGjsonb) infixl 6

Delete a key or keys from a JSON object, or remove an array element.

If the right operand is

text : Delete key / value pair or string element from left operand. Key / value pairs are matched based on their key value,

text[] : Delete multiple key / value pairs or string elements from left operand. Key / value pairs are matched based on their key value,

integer : Delete the array element with specified index (Negative integers count from the end). Throws an error if top level container is not an array.

(#-.) :: Operator (null PGjsonb) (null (PGvararray (NotNull PGtext))) (null PGjsonb) infixl 6

Delete the field or element with specified path (for JSON arrays, negative integers count from the end)

Json and Jsonb functions

toJson :: null ty :--> null PGjson

Returns the value as json. Arrays and composites are converted (recursively) to arrays and objects; otherwise, if there is a cast from the type to json, the cast function will be used to perform the conversion; otherwise, a scalar value is produced. For any scalar type other than a number, a Boolean, or a null value, the text representation will be used, in such a fashion that it is a valid json value.

toJsonb :: null ty :--> null PGjsonb

Returns the value as jsonb. Arrays and composites are converted (recursively) to arrays and objects; otherwise, if there is a cast from the type to json, the cast function will be used to perform the conversion; otherwise, a scalar value is produced. For any scalar type other than a number, a Boolean, or a null value, the text representation will be used, in such a fashion that it is a valid jsonb value.

arrayToJson :: null (PGvararray ty) :--> null PGjson

Returns the array as a JSON array. A PostgreSQL multidimensional array becomes a JSON array of arrays.

rowToJson :: null (PGcomposite ty) :--> null PGjson

Returns the row as a JSON object.

jsonBuildArray :: SListI tuple => FunctionN tuple (null PGjson)

Builds a possibly-heterogeneously-typed JSON array out of a variadic argument list.

jsonbBuildArray :: SListI tuple => FunctionN tuple (null PGjsonb)

Builds a possibly-heterogeneously-typed (binary) JSON array out of a variadic argument list.

class SListI tys => JsonBuildObject tys where

Builds a possibly-heterogeneously-typed JSON object out of a variadic argument list. The elements of the argument list must alternate between text and values.

Minimal complete definition

Nothing

Methods

jsonBuildObject :: FunctionN tys (null PGjson)

jsonbBuildObject :: FunctionN tys (null PGjsonb)

Instances

JsonBuildObject ([] :: [NullityType])

Defined in Squeal.PostgreSQL.Expression.Json

Methods

jsonBuildObject :: FunctionN [] (null PGjson)

jsonbBuildObject :: FunctionN [] (null PGjsonb)

(JsonBuildObject tys, In key PGJsonKey) => JsonBuildObject (NotNull key ': (value ': tys))

Defined in Squeal.PostgreSQL.Expression.Json

Methods

jsonBuildObject :: FunctionN (NotNull key ': (value ': tys)) (null PGjson)

jsonbBuildObject :: FunctionN (NotNull key ': (value ': tys)) (null PGjsonb)

jsonObject :: null (PGfixarray '[n, 2] (NotNull PGtext)) :--> null PGjson

Builds a JSON object out of a text array. The array must have two dimensions such that each inner array has exactly two elements, which are taken as a key/value pair.

jsonbObject :: null (PGfixarray '[n, 2] (NotNull PGtext)) :--> null PGjsonb

Builds a binary JSON object out of a text array. The array must have two dimensions such that each inner array has exactly two elements, which are taken as a key/value pair.

jsonZipObject :: FunctionN '[null (PGvararray (NotNull PGtext)), null (PGvararray (NotNull PGtext))] (null PGjson)

This is an alternate form of jsonObject that takes two arrays; one for keys and one for values, that are zipped pairwise to create a JSON object.

jsonbZipObject :: FunctionN '[null (PGvararray (NotNull PGtext)), null (PGvararray (NotNull PGtext))] (null PGjsonb)

This is an alternate form of jsonbObject that takes two arrays; one for keys and one for values, that are zipped pairwise to create a binary JSON object.

jsonArrayLength :: null PGjson :--> null PGint4

Returns the number of elements in the outermost JSON array.

jsonbArrayLength :: null PGjsonb :--> null PGint4

Returns the number of elements in the outermost binary JSON array.

jsonTypeof :: null PGjson :--> null PGtext

Returns the type of the outermost JSON value as a text string. Possible types are object, array, string, number, boolean, and null.

jsonbTypeof :: null PGjsonb :--> null PGtext

Returns the type of the outermost binary JSON value as a text string. Possible types are object, array, string, number, boolean, and null.

jsonStripNulls :: null PGjson :--> null PGjson

Returns its argument with all object fields that have null values omitted. Other null values are untouched.

jsonbStripNulls :: null PGjsonb :--> null PGjsonb

Returns its argument with all object fields that have null values omitted. Other null values are untouched.

jsonbSet :: FunctionN '[null PGjsonb, null (PGvararray (NotNull PGtext)), null PGjsonb, null PGbool] (null PGjsonb)

 jsonbSet target path new_value create_missing

Returns target with the section designated by path replaced by new_value, or with new_value added if create_missing is true and the item designated by path does not exist. As with the path orientated operators, negative integers that appear in path count from the end of JSON arrays.

jsonbInsert :: FunctionN '[null PGjsonb, null (PGvararray (NotNull PGtext)), null PGjsonb, null PGbool] (null PGjsonb)

 jsonbInsert target path new_value insert_after

Returns target with new_value inserted. If target section designated by path is in a JSONB array, new_value will be inserted before target or after if insert_after is true. If target section designated by path is in JSONB object, new_value will be inserted only if target does not exist. As with the path orientated operators, negative integers that appear in path count from the end of JSON arrays.

jsonbPretty :: null PGjsonb :--> null PGtext

Returns its argument as indented JSON text.

Json and Jsonb set returning functions

jsonEach :: SetOfFunction "json_each" (null PGjson) '["key" ::: NotNull PGtext, "value" ::: NotNull PGjson]

Expands the outermost JSON object into a set of key/value pairs.

>>> printSQL (select Star (from (jsonEach (literal (Json (object ["a" .= "foo", "b" .= "bar"]))))))
SELECT * FROM json_each(('{"a":"foo","b":"bar"}' :: json))

jsonbEach :: SetOfFunction "jsonb_each" (nullity PGjsonb) '["key" ::: NotNull PGtext, "value" ::: NotNull PGjson]

Expands the outermost binary JSON object into a set of key/value pairs.

>>> printSQL (select Star (from (jsonbEach (literal (Jsonb (object ["a" .= "foo", "b" .= "bar"]))))))
SELECT * FROM jsonb_each(('{"a":"foo","b":"bar"}' :: jsonb))

jsonEachText :: SetOfFunction "json_each_text" (null PGjson) '["key" ::: NotNull PGtext, "value" ::: NotNull PGtext]

Expands the outermost JSON object into a set of key/value pairs.

>>> printSQL (select Star (from (jsonEachText (literal (Json (object ["a" .= "foo", "b" .= "bar"]))))))
SELECT * FROM json_each_text(('{"a":"foo","b":"bar"}' :: json))

jsonbEachText :: SetOfFunction "jsonb_each_text" (null PGjsonb) '["key" ::: NotNull PGtext, "value" ::: NotNull PGtext]

Expands the outermost binary JSON object into a set of key/value pairs.

>>> printSQL (select Star (from (jsonbEachText (literal (Jsonb (object ["a" .= "foo", "b" .= "bar"]))))))
SELECT * FROM jsonb_each_text(('{"a":"foo","b":"bar"}' :: jsonb))

jsonObjectKeys :: SetOfFunction "json_object_keys" (nullity PGjson) '["json_object_keys" ::: NotNull PGtext]

Returns set of keys in the outermost JSON object.

>>> printSQL (jsonObjectKeys (literal (Json (object ["a" .= "foo", "b" .= "bar"]))))
json_object_keys(('{"a":"foo","b":"bar"}' :: json))

jsonbObjectKeys :: SetOfFunction "jsonb_object_keys" (null PGjsonb) '["jsonb_object_keys" ::: NotNull PGtext]

Returns set of keys in the outermost JSON object.

>>> printSQL (jsonbObjectKeys (literal (Jsonb (object ["a" .= "foo", "b" .= "bar"]))))
jsonb_object_keys(('{"a":"foo","b":"bar"}' :: jsonb))

type JsonPopulateFunction fun json

Arguments

 = json `In` PGJsonType

=> TypeExpression schemas (NotNull (PGcomposite row))

row type

-> Expression outer commons Ungrouped schemas params '[] (NotNull json)

json type

-> FromClause outer commons schemas params '[fun ::: row]

Build rows from Json types.

jsonPopulateRecord :: JsonPopulateFunction "json_populate_record" PGjson

Expands the JSON expression to a row whose columns match the record type defined by the given table.

jsonbPopulateRecord :: JsonPopulateFunction "jsonb_populate_record" PGjsonb

Expands the binary JSON expression to a row whose columns match the record type defined by the given table.

jsonPopulateRecordSet :: JsonPopulateFunction "json_populate_record_set" PGjson

Expands the outermost array of objects in the given JSON expression to a set of rows whose columns match the record type defined by the given table.

jsonbPopulateRecordSet :: JsonPopulateFunction "jsonb_populate_record_set" PGjsonb

Expands the outermost array of objects in the given binary JSON expression to a set of rows whose columns match the record type defined by the given table.

type JsonToRecordFunction json

Arguments

 = (SListI row, json `In` PGJsonType)

=> Expression outer commons Ungrouped schemas params '[] (NotNull json)

json type

-> Aliased (NP (Aliased (TypeExpression schemas))) (tab ::: row)

row type

-> FromClause outer commons schemas params '[tab ::: row]

Build rows from Json types.

jsonToRecord :: JsonToRecordFunction PGjson

Builds an arbitrary record from a JSON object.

jsonbToRecord :: JsonToRecordFunction PGjsonb

Builds an arbitrary record from a binary JSON object.

jsonToRecordSet :: JsonToRecordFunction PGjson

Builds an arbitrary set of records from a JSON array of objects.

jsonbToRecordSet :: JsonToRecordFunction PGjsonb

Builds an arbitrary set of records from a binary JSON array of objects.