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New json functions.

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json_build_array() and json_build_object allow for the construction of
arbitrarily complex json trees. json_object() turns a one or two
dimensional array, or two separate arrays, into a json_object of
name/value pairs, similarly to the hstore() function.
json_object_agg() aggregates its two arguments into a single json object
as name value pairs.

Catalog version bumped.

Andrew Dunstan, reviewed by Marko Tiikkaja.
This commit is contained in:
Andrew Dunstan
2014-01-28 17:48:21 -05:00
parent 9132b189bf
commit 105639900b
10 changed files with 1221 additions and 71 deletions
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158
doc/src/sgml/func.sgml
View File

@ -10300,6 +10300,137 @@ table2-mapping
<entry><literal>json_typeof('-123.4')</literal></entry> <entry><literal>json_typeof('-123.4')</literal></entry>
<entry><literal>number</literal></entry> <entry><literal>number</literal></entry>
</row> </row>
<row>
<entry>
<indexterm>
<primary>json_build_array</primary>
</indexterm>
<literal>json_build_array(VARIADIC "any")</literal>
</entry>
<entry><type>json</type></entry>
<entry>
Builds a heterogeneously typed json array out of a variadic argument list.
</entry>
<entry><literal>SELECT json_build_array(1,2,'3',4,5);</literal></entry>
<entry>
<programlisting>
json_build_array
-------------------
[1, 2, "3", 4, 5]
</programlisting>
</entry>
</row>
<row>
<entry>
<indexterm>
<primary>json_build_object</primary>
</indexterm>
<literal>json_build_object(VARIADIC "any")</literal>
</entry>
<entry><type>json</type></entry>
<entry>
Builds a JSON array out of a variadic agument list. By convention, the object is
constructed out of alternating name/value arguments.
</entry>
<entry><literal>SELECT json_build_object('foo',1,'bar',2);</literal></entry>
<entry>
<programlisting>
json_build_object
------------------------
{"foo" : 1, "bar" : 2}
</programlisting>
</entry>
</row>
<row>
<entry>
<indexterm>
<primary>json_object</primary>
</indexterm>
<literal>json_object(text[])</literal>
</entry>
<entry><type>json</type></entry>
<entry>
Builds a JSON object out of a text array. The array must have either
exactly one dimension with an even number of members, in which case
they are taken as alternating name/value pairs, or two dimensions
such that each inner array has exactly two elements, which
are taken as a name/value pair.
</entry>
<entry><literal>select * from json_object('{a, 1, b, "def", c, 3.5}') or <literal>select * from json_object('{{a, 1},{b, "def"},{c, 3.5}}')</literal></literal></entry>
<entry>
<programlisting>
json_object
---------------------------------------
{"a" : "1", "b" : "def", "c" : "3.5"}
</programlisting>
</entry>
</row>
<row>
<entry>
<literal>json_object(keys text[], values text[])</literal>
</entry>
<entry><type>json</type></entry>
<entry>
The two argument form of JSON object takes keys and values pairwise from two separate
arrays. In all other respects it is identical to the one argument form.
</entry>
<entry><literal>select * from json_object('{a, b}', '{1,2}');</literal></entry>
<entry>
<programlisting>
json_object
------------------------
{"a" : "1", "b" : "2"}
</programlisting>
</entry>
</row>
<row>
<entry>
<indexterm>
<primary>json_to_record</primary>
</indexterm>
<literal>json_to_record(json, nested_as_text bool)</literal>
</entry>
<entry><type>record</type></entry>
<entry>
json_to_record returns an arbitrary record from a JSON object. As with all functions
returning 'record', the caller must explicitly define the structure of the record
when making the call. The input JSON must be an object, not a scalar or an array.
If nested_as_text is true, the function coerces nested complex elements to text.
Also, see notes below on columns and types.
</entry>
<entry><literal>select * from json_to_record('{"a":1,"b":[1,2,3],"c":"bar"}',true) as x(a int, b text, d text) </literal></entry>
<entry>
<programlisting>
a | b | d
---+---------+---
1 | [1,2,3] |
</programlisting>
</entry>
</row>
<row>
<entry>
<indexterm>
<primary>json_to_recordset</primary>
</indexterm>
<literal>json_to_recordset(json, nested_as_text bool)</literal>
</entry>
<entry><type>setof record</type></entry>
<entry>
json_to_recordset returns an arbitrary set of records from a JSON object. As with
json_to_record, the structure of the record must be explicitly defined when making the
call. However, with json_to_recordset the input JSON must be an array containing
objects. nested_as_text works as with json_to_record.
</entry>
<entry><literal>select * from json_to_recordset('[{"a":1,"b":"foo"},{"a":"2","c":"bar"}]',true) as x(a int, b text);</literal></entry>
<entry>
<programlisting>
a | b
---+-----
1 | foo
2 |
</programlisting>
</entry>
</row>
</tbody> </tbody>
</tgroup> </tgroup>
</table> </table>
@ -10324,6 +10455,17 @@ table2-mapping
</para> </para>
</note> </note>
<note>
<para>
In json_to_record and json_to_recordset, type coercion from the JSON is
"best effort" and may not result in desired values for some types. JSON
elements are matched to identical field names in the record definition,
and elements which do not exist in the JSON will simply be NULL. JSON
elements which are not defined in the record template will
be omitted from the output.
</para>
</note>
<note> <note>
<para> <para>
The <xref linkend="hstore"> extension has a cast from <type>hstore</type> to The <xref linkend="hstore"> extension has a cast from <type>hstore</type> to
@ -11772,6 +11914,22 @@ NULL baz</literallayout>(3 rows)</entry>
<entry>aggregates records as a JSON array of objects</entry> <entry>aggregates records as a JSON array of objects</entry>
</row> </row>
<row>
<entry>
<indexterm>
<primary>json_object_agg</primary>
</indexterm>
<function>json_object_agg(<replaceable class="parameter">expression</replaceable>)</function>
</entry>
<entry>
<type>("any", "any")</type>
</entry>
<entry>
<type>json</type>
</entry>
<entry>aggregates name/value pairs as a JSON object</entry>
</row>
<row> <row>
<entry> <entry>
<indexterm> <indexterm>

561
src/backend/utils/adt/json.c
View File

@ -68,6 +68,10 @@ static void array_dim_to_json(StringInfo result, int dim, int ndims, int *dims,
bool use_line_feeds); bool use_line_feeds);
static void array_to_json_internal(Datum array, StringInfo result, static void array_to_json_internal(Datum array, StringInfo result,
bool use_line_feeds); bool use_line_feeds);
static void datum_to_json(Datum val, bool is_null, StringInfo result,
TYPCATEGORY tcategory, Oid typoutputfunc, bool key_scalar);
static void add_json(Datum val, bool is_null, StringInfo result,
Oid val_type, bool key_scalar);
/* the null action object used for pure validation */ /* the null action object used for pure validation */
static JsonSemAction nullSemAction = static JsonSemAction nullSemAction =
@ -1219,7 +1223,7 @@ extract_mb_char(char *s)
*/ */
static void static void
datum_to_json(Datum val, bool is_null, StringInfo result, datum_to_json(Datum val, bool is_null, StringInfo result,
TYPCATEGORY tcategory, Oid typoutputfunc) TYPCATEGORY tcategory, Oid typoutputfunc, bool key_scalar)
{ {
char *outputstr; char *outputstr;
text *jsontext; text *jsontext;
@ -1241,16 +1245,23 @@ datum_to_json(Datum val, bool is_null, StringInfo result,
composite_to_json(val, result, false); composite_to_json(val, result, false);
break; break;
case TYPCATEGORY_BOOLEAN: case TYPCATEGORY_BOOLEAN:
if (DatumGetBool(val)) if (!key_scalar)
appendStringInfoString(result, "true"); appendStringInfoString(result, DatumGetBool(val) ? "true" : "false");
else else
appendStringInfoString(result, "false"); escape_json(result, DatumGetBool(val) ? "true" : "false");
break; break;
case TYPCATEGORY_NUMERIC: case TYPCATEGORY_NUMERIC:
outputstr = OidOutputFunctionCall(typoutputfunc, val); outputstr = OidOutputFunctionCall(typoutputfunc, val);
if (key_scalar)
{
/* always quote keys */
escape_json(result, outputstr);
}
else
{
/* /*
* Don't call escape_json here if it's a valid JSON number. * Don't call escape_json for a non-key if it's a valid JSON
* number.
*/ */
dummy_lex.input = *outputstr == '-' ? outputstr + 1 : outputstr; dummy_lex.input = *outputstr == '-' ? outputstr + 1 : outputstr;
dummy_lex.input_length = strlen(dummy_lex.input); dummy_lex.input_length = strlen(dummy_lex.input);
@ -1259,6 +1270,7 @@ datum_to_json(Datum val, bool is_null, StringInfo result,
appendStringInfoString(result, outputstr); appendStringInfoString(result, outputstr);
else else
escape_json(result, outputstr); escape_json(result, outputstr);
}
pfree(outputstr); pfree(outputstr);
break; break;
case TYPCATEGORY_JSON: case TYPCATEGORY_JSON:
@ -1276,6 +1288,10 @@ datum_to_json(Datum val, bool is_null, StringInfo result,
break; break;
default: default:
outputstr = OidOutputFunctionCall(typoutputfunc, val); outputstr = OidOutputFunctionCall(typoutputfunc, val);
if (key_scalar && *outputstr == '\0')
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("key value must not be empty")));
escape_json(result, outputstr); escape_json(result, outputstr);
pfree(outputstr); pfree(outputstr);
break; break;
@ -1309,7 +1325,7 @@ array_dim_to_json(StringInfo result, int dim, int ndims, int *dims, Datum *vals,
if (dim + 1 == ndims) if (dim + 1 == ndims)
{ {
datum_to_json(vals[*valcount], nulls[*valcount], result, tcategory, datum_to_json(vals[*valcount], nulls[*valcount], result, tcategory,
typoutputfunc); typoutputfunc, false);
(*valcount)++; (*valcount)++;
} }
else else
@ -1490,13 +1506,75 @@ composite_to_json(Datum composite, StringInfo result, bool use_line_feeds)
else else
tcategory = TypeCategory(tupdesc->attrs[i]->atttypid); tcategory = TypeCategory(tupdesc->attrs[i]->atttypid);
datum_to_json(val, isnull, result, tcategory, typoutput); datum_to_json(val, isnull, result, tcategory, typoutput, false);
} }
appendStringInfoChar(result, '}'); appendStringInfoChar(result, '}');
ReleaseTupleDesc(tupdesc); ReleaseTupleDesc(tupdesc);
} }
/*
* append Json for orig_val to result. If it's a field key, make sure it's
* of an acceptable type and is quoted.
*/
static void
add_json(Datum val, bool is_null, StringInfo result, Oid val_type, bool key_scalar)
{
TYPCATEGORY tcategory;
Oid typoutput;
bool typisvarlena;
Oid castfunc = InvalidOid;
if (val_type == InvalidOid)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not determine input data type")));
getTypeOutputInfo(val_type, &typoutput, &typisvarlena);
if (val_type > FirstNormalObjectId)
{
HeapTuple tuple;
Form_pg_cast castForm;
tuple = SearchSysCache2(CASTSOURCETARGET,
ObjectIdGetDatum(val_type),
ObjectIdGetDatum(JSONOID));
if (HeapTupleIsValid(tuple))
{
castForm = (Form_pg_cast) GETSTRUCT(tuple);
if (castForm->castmethod == COERCION_METHOD_FUNCTION)
castfunc = typoutput = castForm->castfunc;
ReleaseSysCache(tuple);
}
}
if (castfunc != InvalidOid)
tcategory = TYPCATEGORY_JSON_CAST;
else if (val_type == RECORDARRAYOID)
tcategory = TYPCATEGORY_ARRAY;
else if (val_type == RECORDOID)
tcategory = TYPCATEGORY_COMPOSITE;
else if (val_type == JSONOID)
tcategory = TYPCATEGORY_JSON;
else
tcategory = TypeCategory(val_type);
if (key_scalar &&
(tcategory == TYPCATEGORY_ARRAY ||
tcategory == TYPCATEGORY_COMPOSITE ||
tcategory == TYPCATEGORY_JSON ||
tcategory == TYPCATEGORY_JSON_CAST))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("key value must be scalar, not array, composite or json")));
datum_to_json(val, is_null, result, tcategory, typoutput, key_scalar);
}
/* /*
* SQL function array_to_json(row) * SQL function array_to_json(row)
*/ */
@ -1616,7 +1694,7 @@ to_json(PG_FUNCTION_ARGS)
else else
tcategory = TypeCategory(val_type); tcategory = TypeCategory(val_type);
datum_to_json(val, false, result, tcategory, typoutput); datum_to_json(val, false, result, tcategory, typoutput, false);
PG_RETURN_TEXT_P(cstring_to_text_with_len(result->data, result->len)); PG_RETURN_TEXT_P(cstring_to_text_with_len(result->data, result->len));
} }
@ -1672,7 +1750,7 @@ json_agg_transfn(PG_FUNCTION_ARGS)
if (PG_ARGISNULL(1)) if (PG_ARGISNULL(1))
{ {
val = (Datum) 0; val = (Datum) 0;
datum_to_json(val, true, state, 0, InvalidOid); datum_to_json(val, true, state, 0, InvalidOid, false);
PG_RETURN_POINTER(state); PG_RETURN_POINTER(state);
} }
@ -1716,7 +1794,7 @@ json_agg_transfn(PG_FUNCTION_ARGS)
appendStringInfoString(state, "\n "); appendStringInfoString(state, "\n ");
} }
datum_to_json(val, false, state, tcategory, typoutput); datum_to_json(val, false, state, tcategory, typoutput, false);
/* /*
* The transition type for array_agg() is declared to be "internal", which * The transition type for array_agg() is declared to be "internal", which
@ -1747,6 +1825,467 @@ json_agg_finalfn(PG_FUNCTION_ARGS)
PG_RETURN_TEXT_P(cstring_to_text_with_len(state->data, state->len)); PG_RETURN_TEXT_P(cstring_to_text_with_len(state->data, state->len));
} }
/*
* json_object_agg transition function.
*
* aggregate two input columns as a single json value.
*/
Datum
json_object_agg_transfn(PG_FUNCTION_ARGS)
{
Oid val_type;
MemoryContext aggcontext,
oldcontext;
StringInfo state;
Datum arg;
if (!AggCheckCallContext(fcinfo, &aggcontext))
{
/* cannot be called directly because of internal-type argument */
elog(ERROR, "json_agg_transfn called in non-aggregate context");
}
if (PG_ARGISNULL(0))
{
/*
* Make this StringInfo in a context where it will persist for the
* duration off the aggregate call. It's only needed for this initial
* piece, as the StringInfo routines make sure they use the right
* context to enlarge the object if necessary.
*/
oldcontext = MemoryContextSwitchTo(aggcontext);
state = makeStringInfo();
MemoryContextSwitchTo(oldcontext);
appendStringInfoString(state, "{ ");
}
else
{
state = (StringInfo) PG_GETARG_POINTER(0);
appendStringInfoString(state, ", ");
}
if (PG_ARGISNULL(1))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("field name must not be null")));
val_type = get_fn_expr_argtype(fcinfo->flinfo, 1);
/*
* turn a constant (more or less literal) value that's of unknown type
* into text. Unknowns come in as a cstring pointer.
*/
if (val_type == UNKNOWNOID && get_fn_expr_arg_stable(fcinfo->flinfo, 1))
{
val_type = TEXTOID;
arg = CStringGetTextDatum(PG_GETARG_POINTER(1));
}
else
{
arg = PG_GETARG_DATUM(1);
}
if (val_type == InvalidOid || val_type == UNKNOWNOID)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("arg 1: could not determine data type")));
add_json(arg, false, state, val_type, true);
appendStringInfoString(state, " : ");
val_type = get_fn_expr_argtype(fcinfo->flinfo, 2);
/* see comments above */
if (val_type == UNKNOWNOID && get_fn_expr_arg_stable(fcinfo->flinfo, 2))
{
val_type = TEXTOID;
if (PG_ARGISNULL(2))
arg = (Datum) 0;
else
arg = CStringGetTextDatum(PG_GETARG_POINTER(2));
}
else
{
arg = PG_GETARG_DATUM(2);
}
if (val_type == InvalidOid || val_type == UNKNOWNOID)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("arg 2: could not determine data type")));
add_json(arg, PG_ARGISNULL(2), state, val_type, false);
PG_RETURN_POINTER(state);
}
/*
* json_object_agg final function.
*
*/
Datum
json_object_agg_finalfn(PG_FUNCTION_ARGS)
{
StringInfo state;
/* cannot be called directly because of internal-type argument */
Assert(AggCheckCallContext(fcinfo, NULL));
state = PG_ARGISNULL(0) ? NULL : (StringInfo) PG_GETARG_POINTER(0);
if (state == NULL)
PG_RETURN_TEXT_P(cstring_to_text("{}"));
appendStringInfoString(state, " }");
PG_RETURN_TEXT_P(cstring_to_text_with_len(state->data, state->len));
}
/*
* SQL function json_build_object(variadic "any")
*/
Datum
json_build_object(PG_FUNCTION_ARGS)
{
int nargs = PG_NARGS();
int i;
Datum arg;
char *sep = "";
StringInfo result;
Oid val_type;
if (nargs % 2 != 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid number or arguments: object must be matched key value pairs")));
result = makeStringInfo();
appendStringInfoChar(result, '{');
for (i = 0; i < nargs; i += 2)
{
/* process key */
if (PG_ARGISNULL(i))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("arg %d: key cannot be null", i + 1)));
val_type = get_fn_expr_argtype(fcinfo->flinfo, i);
/*
* turn a constant (more or less literal) value that's of unknown type
* into text. Unknowns come in as a cstring pointer.
*/
if (val_type == UNKNOWNOID && get_fn_expr_arg_stable(fcinfo->flinfo, i))
{
val_type = TEXTOID;
if (PG_ARGISNULL(i))
arg = (Datum) 0;
else
arg = CStringGetTextDatum(PG_GETARG_POINTER(i));
}
else
{
arg = PG_GETARG_DATUM(i);
}
if (val_type == InvalidOid || val_type == UNKNOWNOID)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("arg %d: could not determine data type", i + 1)));
appendStringInfoString(result, sep);
sep = ", ";
add_json(arg, false, result, val_type, true);
appendStringInfoString(result, " : ");
/* process value */
val_type = get_fn_expr_argtype(fcinfo->flinfo, i + 1);
/* see comments above */
if (val_type == UNKNOWNOID && get_fn_expr_arg_stable(fcinfo->flinfo, i + 1))
{
val_type = TEXTOID;
if (PG_ARGISNULL(i + 1))
arg = (Datum) 0;
else
arg = CStringGetTextDatum(PG_GETARG_POINTER(i + 1));
}
else
{
arg = PG_GETARG_DATUM(i + 1);
}
if (val_type == InvalidOid || val_type == UNKNOWNOID)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("arg %d: could not determine data type", i + 2)));
add_json(arg, PG_ARGISNULL(i + 1), result, val_type, false);
}
appendStringInfoChar(result, '}');
PG_RETURN_TEXT_P(cstring_to_text_with_len(result->data, result->len));
}
/*
* degenerate case of json_build_object where it gets 0 arguments.
*/
Datum
json_build_object_noargs(PG_FUNCTION_ARGS)
{
PG_RETURN_TEXT_P(cstring_to_text_with_len("{}", 2));
}
/*
* SQL function json_build_array(variadic "any")
*/
Datum
json_build_array(PG_FUNCTION_ARGS)
{
int nargs = PG_NARGS();
int i;
Datum arg;
char *sep = "";
StringInfo result;
Oid val_type;
result = makeStringInfo();
appendStringInfoChar(result, '[');
for (i = 0; i < nargs; i++)
{
val_type = get_fn_expr_argtype(fcinfo->flinfo, i);
arg = PG_GETARG_DATUM(i + 1);
/* see comments in json_build_object above */
if (val_type == UNKNOWNOID && get_fn_expr_arg_stable(fcinfo->flinfo, i))
{
val_type = TEXTOID;
if (PG_ARGISNULL(i))
arg = (Datum) 0;
else
arg = CStringGetTextDatum(PG_GETARG_POINTER(i));
}
else
{
arg = PG_GETARG_DATUM(i);
}
if (val_type == InvalidOid || val_type == UNKNOWNOID)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("arg %d: could not determine data type", i + 1)));
appendStringInfoString(result, sep);
sep = ", ";
add_json(arg, PG_ARGISNULL(i), result, val_type, false);
}
appendStringInfoChar(result, ']');
PG_RETURN_TEXT_P(cstring_to_text_with_len(result->data, result->len));
}
/*
* degenerate case of json_build_array where it gets 0 arguments.
*/
Datum
json_build_array_noargs(PG_FUNCTION_ARGS)
{
PG_RETURN_TEXT_P(cstring_to_text_with_len("[]", 2));
}
/*
* SQL function json_object(text[])
*
* take a one or two dimensional array of text as name vale pairs
* for a json object.
*
*/
Datum
json_object(PG_FUNCTION_ARGS)
{
ArrayType *in_array = PG_GETARG_ARRAYTYPE_P(0);
int ndims = ARR_NDIM(in_array);
StringInfoData result;
Datum *in_datums;
bool *in_nulls;
int in_count,
count,
i;
text *rval;
char *v;
switch (ndims)
{
case 0:
PG_RETURN_DATUM(CStringGetTextDatum("{}"));
break;
case 1:
if ((ARR_DIMS(in_array)[0]) % 2)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("array must have even number of elements")));
break;
case 2:
if ((ARR_DIMS(in_array)[1]) != 2)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("array must have two columns")));
break;
default:
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("wrong number of array subscripts")));
}
deconstruct_array(in_array,
TEXTOID, -1, false, 'i',
&in_datums, &in_nulls, &in_count);
count = in_count / 2;
initStringInfo(&result);
appendStringInfoChar(&result, '{');
for (i = 0; i < count; ++i)
{
if (in_nulls[i * 2])
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("null value not allowed for object key")));
v = TextDatumGetCString(in_datums[i * 2]);
if (v[0] == '\0')
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("empty value not allowed for object key")));
if (i > 0)
appendStringInfoString(&result, ", ");
escape_json(&result, v);
appendStringInfoString(&result, " : ");
pfree(v);
if (in_nulls[i * 2 + 1])
appendStringInfoString(&result, "null");
else
{
v = TextDatumGetCString(in_datums[i * 2 + 1]);
escape_json(&result, v);
pfree(v);
}
}
appendStringInfoChar(&result, '}');
pfree(in_datums);
pfree(in_nulls);
rval = cstring_to_text_with_len(result.data, result.len);
pfree(result.data);
PG_RETURN_TEXT_P(rval);
}
/*
* SQL function json_object(text[], text[])
*
* take separate name and value arrays of text to construct a json object
* pairwise.
*/
Datum
json_object_two_arg(PG_FUNCTION_ARGS)
{
ArrayType *key_array = PG_GETARG_ARRAYTYPE_P(0);
ArrayType *val_array = PG_GETARG_ARRAYTYPE_P(1);
int nkdims = ARR_NDIM(key_array);
int nvdims = ARR_NDIM(val_array);
StringInfoData result;
Datum *key_datums,
*val_datums;
bool *key_nulls,
*val_nulls;
int key_count,
val_count,
i;
text *rval;
char *v;
if (nkdims > 1 || nkdims != nvdims)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("wrong number of array subscripts")));
if (nkdims == 0)
PG_RETURN_DATUM(CStringGetTextDatum("{}"));
deconstruct_array(key_array,
TEXTOID, -1, false, 'i',
&key_datums, &key_nulls, &key_count);
deconstruct_array(val_array,
TEXTOID, -1, false, 'i',
&val_datums, &val_nulls, &val_count);
if (key_count != val_count)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("mismatched array dimensions")));
initStringInfo(&result);
appendStringInfoChar(&result, '{');
for (i = 0; i < key_count; ++i)
{
if (key_nulls[i])
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("null value not allowed for object key")));
v = TextDatumGetCString(key_datums[i]);
if (v[0] == '\0')
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("empty value not allowed for object key")));
if (i > 0)
appendStringInfoString(&result, ", ");
escape_json(&result, v);
appendStringInfoString(&result, " : ");
pfree(v);
if (val_nulls[i])
appendStringInfoString(&result, "null");
else
{
v = TextDatumGetCString(val_datums[i]);
escape_json(&result, v);
pfree(v);
}
}
appendStringInfoChar(&result, '}');
pfree(key_datums);
pfree(key_nulls);
pfree(val_datums);
pfree(val_nulls);
rval = cstring_to_text_with_len(result.data, result.len);
pfree(result.data);
PG_RETURN_TEXT_P(rval);
}
/* /*
* Produce a JSON string literal, properly escaping characters in the text. * Produce a JSON string literal, properly escaping characters in the text.
*/ */

106
src/backend/utils/adt/jsonfuncs.c
View File

@ -75,6 +75,10 @@ static void elements_scalar(void *state, char *token, JsonTokenType tokentype);
/* turn a json object into a hash table */ /* turn a json object into a hash table */
static HTAB *get_json_object_as_hash(text *json, char *funcname, bool use_json_as_text); static HTAB *get_json_object_as_hash(text *json, char *funcname, bool use_json_as_text);
/* common worker for populate_record and to_record */
static inline Datum populate_record_worker(PG_FUNCTION_ARGS,
bool have_record_arg);
/* semantic action functions for get_json_object_as_hash */ /* semantic action functions for get_json_object_as_hash */
static void hash_object_field_start(void *state, char *fname, bool isnull); static void hash_object_field_start(void *state, char *fname, bool isnull);
static void hash_object_field_end(void *state, char *fname, bool isnull); static void hash_object_field_end(void *state, char *fname, bool isnull);
@ -90,6 +94,10 @@ static void populate_recordset_object_end(void *state);
static void populate_recordset_array_start(void *state); static void populate_recordset_array_start(void *state);
static void populate_recordset_array_element_start(void *state, bool isnull); static void populate_recordset_array_element_start(void *state, bool isnull);
/* worker function for populate_recordset and to_recordset */
static inline Datum populate_recordset_worker(PG_FUNCTION_ARGS,
bool have_record_arg);
/* search type classification for json_get* functions */ /* search type classification for json_get* functions */
typedef enum typedef enum
{ {
@ -1216,11 +1224,22 @@ elements_scalar(void *state, char *token, JsonTokenType tokentype)
Datum Datum
json_populate_record(PG_FUNCTION_ARGS) json_populate_record(PG_FUNCTION_ARGS)
{ {
Oid argtype = get_fn_expr_argtype(fcinfo->flinfo, 0); return populate_record_worker(fcinfo, true);
}
Datum
json_to_record(PG_FUNCTION_ARGS)
{
return populate_record_worker(fcinfo, false);
}
static inline Datum
populate_record_worker(PG_FUNCTION_ARGS, bool have_record_arg)
{
text *json; text *json;
bool use_json_as_text; bool use_json_as_text;
HTAB *json_hash; HTAB *json_hash;
HeapTupleHeader rec; HeapTupleHeader rec = NULL;
Oid tupType; Oid tupType;
int32 tupTypmod; int32 tupTypmod;
TupleDesc tupdesc; TupleDesc tupdesc;
@ -1234,6 +1253,10 @@ json_populate_record(PG_FUNCTION_ARGS)
char fname[NAMEDATALEN]; char fname[NAMEDATALEN];
JsonHashEntry *hashentry; JsonHashEntry *hashentry;
if (have_record_arg)
{
Oid argtype = get_fn_expr_argtype(fcinfo->flinfo, 0);
use_json_as_text = PG_ARGISNULL(2) ? false : PG_GETARG_BOOL(2); use_json_as_text = PG_ARGISNULL(2) ? false : PG_GETARG_BOOL(2);
if (!type_is_rowtype(argtype)) if (!type_is_rowtype(argtype))
@ -1246,12 +1269,10 @@ json_populate_record(PG_FUNCTION_ARGS)
if (PG_ARGISNULL(1)) if (PG_ARGISNULL(1))
PG_RETURN_NULL(); PG_RETURN_NULL();
rec = NULL;
/* /*
* have no tuple to look at, so the only source of type info is the * have no tuple to look at, so the only source of type info is
* argtype. The lookup_rowtype_tupdesc call below will error out if we * the argtype. The lookup_rowtype_tupdesc call below will error
* don't have a known composite type oid here. * out if we don't have a known composite type oid here.
*/ */
tupType = argtype; tupType = argtype;
tupTypmod = -1; tupTypmod = -1;
@ -1269,19 +1290,38 @@ json_populate_record(PG_FUNCTION_ARGS)
} }
json = PG_GETARG_TEXT_P(1); json = PG_GETARG_TEXT_P(1);
}
else
{
/* json_to_record case */
json_hash = get_json_object_as_hash(json, "json_populate_record", use_json_as_text); use_json_as_text = PG_ARGISNULL(1) ? false : PG_GETARG_BOOL(1);
if (PG_ARGISNULL(0))
PG_RETURN_NULL();
json = PG_GETARG_TEXT_P(0);
get_call_result_type(fcinfo, NULL, &tupdesc);
}
json_hash = get_json_object_as_hash(json, "json_populate_record",
use_json_as_text);
if (have_record_arg)
{
/* /*
* if the input json is empty, we can only skip the rest if we were passed * if the input json is empty, we can only skip the rest if we were
* in a non-null record, since otherwise there may be issues with domain * passed in a non-null record, since otherwise there may be issues
* nulls. * with domain nulls.
*/ */
if (hash_get_num_entries(json_hash) == 0 && rec) if (hash_get_num_entries(json_hash) == 0 && rec)
PG_RETURN_POINTER(rec); PG_RETURN_POINTER(rec);
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod); tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
}
ncolumns = tupdesc->natts; ncolumns = tupdesc->natts;
if (rec) if (rec)
@ -1310,8 +1350,8 @@ json_populate_record(PG_FUNCTION_ARGS)
my_extra->record_typmod = 0; my_extra->record_typmod = 0;
} }
if (my_extra->record_type != tupType || if (have_record_arg && (my_extra->record_type != tupType ||
my_extra->record_typmod != tupTypmod) my_extra->record_typmod != tupTypmod))
{ {
MemSet(my_extra, 0, MemSet(my_extra, 0,
sizeof(RecordIOData) - sizeof(ColumnIOData) sizeof(RecordIOData) - sizeof(ColumnIOData)
@ -1561,7 +1601,22 @@ hash_scalar(void *state, char *token, JsonTokenType tokentype)
Datum Datum
json_populate_recordset(PG_FUNCTION_ARGS) json_populate_recordset(PG_FUNCTION_ARGS)
{ {
Oid argtype = get_fn_expr_argtype(fcinfo->flinfo, 0); return populate_recordset_worker(fcinfo, true);
}
Datum
json_to_recordset(PG_FUNCTION_ARGS)
{
return populate_recordset_worker(fcinfo, false);
}
/*
* common worker for json_populate_recordset() and json_to_recordset()
*/
static inline Datum
populate_recordset_worker(PG_FUNCTION_ARGS, bool have_record_arg)
{
Oid argtype;
text *json; text *json;
bool use_json_as_text; bool use_json_as_text;
ReturnSetInfo *rsi; ReturnSetInfo *rsi;
@ -1576,12 +1631,23 @@ json_populate_recordset(PG_FUNCTION_ARGS)
JsonSemAction *sem; JsonSemAction *sem;
PopulateRecordsetState *state; PopulateRecordsetState *state;
if (have_record_arg)
{
argtype = get_fn_expr_argtype(fcinfo->flinfo, 0);
use_json_as_text = PG_ARGISNULL(2) ? false : PG_GETARG_BOOL(2); use_json_as_text = PG_ARGISNULL(2) ? false : PG_GETARG_BOOL(2);
if (!type_is_rowtype(argtype)) if (!type_is_rowtype(argtype))
ereport(ERROR, ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH), (errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("first argument of json_populate_recordset must be a row type"))); errmsg("first argument of json_populate_recordset must be a row type")));
}
else
{
argtype = InvalidOid;
use_json_as_text = PG_ARGISNULL(1) ? false : PG_GETARG_BOOL(1);
}
rsi = (ReturnSetInfo *) fcinfo->resultinfo; rsi = (ReturnSetInfo *) fcinfo->resultinfo;
@ -1618,6 +1684,8 @@ json_populate_recordset(PG_FUNCTION_ARGS)
MemoryContextSwitchTo(old_cxt); MemoryContextSwitchTo(old_cxt);
/* if the json is null send back an empty set */ /* if the json is null send back an empty set */
if (have_record_arg)
{
if (PG_ARGISNULL(1)) if (PG_ARGISNULL(1))
PG_RETURN_NULL(); PG_RETURN_NULL();
@ -1627,6 +1695,16 @@ json_populate_recordset(PG_FUNCTION_ARGS)
rec = NULL; rec = NULL;
else else
rec = PG_GETARG_HEAPTUPLEHEADER(0); rec = PG_GETARG_HEAPTUPLEHEADER(0);
}
else
{
if (PG_ARGISNULL(0))
PG_RETURN_NULL();
json = PG_GETARG_TEXT_P(0);
rec = NULL;
}
tupType = tupdesc->tdtypeid; tupType = tupdesc->tdtypeid;
tupTypmod = tupdesc->tdtypmod; tupTypmod = tupdesc->tdtypmod;

2
src/include/catalog/catversion.h
View File

@ -53,6 +53,6 @@
*/ */
/* yyyymmddN */ /* yyyymmddN */
#define CATALOG_VERSION_NO 201401211 #define CATALOG_VERSION_NO 201401281
#endif #endif

1
src/include/catalog/pg_aggregate.h
View File

@ -258,6 +258,7 @@ DATA(insert ( 3545 n 0 bytea_string_agg_transfn bytea_string_agg_finalfn 0 2281
/* json */ /* json */
DATA(insert ( 3175 n 0 json_agg_transfn json_agg_finalfn 0 2281 0 _null_ )); DATA(insert ( 3175 n 0 json_agg_transfn json_agg_finalfn 0 2281 0 _null_ ));
DATA(insert ( 3197 n 0 json_object_agg_transfn json_object_agg_finalfn 0 2281 0 _null_ ));
/* ordered-set and hypothetical-set aggregates */ /* ordered-set and hypothetical-set aggregates */
DATA(insert ( 3972 o 1 ordered_set_transition percentile_disc_final 0 2281 0 _null_ )); DATA(insert ( 3972 o 1 ordered_set_transition percentile_disc_final 0 2281 0 _null_ ));

22
src/include/catalog/pg_proc.h
View File

@ -4134,6 +4134,24 @@ DATA(insert OID = 3174 ( json_agg_finalfn PGNSP PGUID 12 1 0 0 0 f f f f f f i
DESCR("json aggregate final function"); DESCR("json aggregate final function");
DATA(insert OID = 3175 ( json_agg PGNSP PGUID 12 1 0 0 0 t f f f f f i 1 0 114 "2283" _null_ _null_ _null_ _null_ aggregate_dummy _null_ _null_ _null_ )); DATA(insert OID = 3175 ( json_agg PGNSP PGUID 12 1 0 0 0 t f f f f f i 1 0 114 "2283" _null_ _null_ _null_ _null_ aggregate_dummy _null_ _null_ _null_ ));
DESCR("aggregate input into json"); DESCR("aggregate input into json");
DATA(insert OID = 3180 ( json_object_agg_transfn PGNSP PGUID 12 1 0 0 0 f f f f f f i 3 0 2281 "2281 2276 2276" _null_ _null_ _null_ _null_ json_object_agg_transfn _null_ _null_ _null_ ));
DESCR("json object aggregate transition function");
DATA(insert OID = 3196 ( json_object_agg_finalfn PGNSP PGUID 12 1 0 0 0 f f f f f f i 1 0 114 "2281" _null_ _null_ _null_ _null_ json_object_agg_finalfn _null_ _null_ _null_ ));
DESCR("json object aggregate final function");
DATA(insert OID = 3197 ( json_object_agg PGNSP PGUID 12 1 0 0 0 t f f f f f i 2 0 114 "2276 2276" _null_ _null_ _null_ _null_ aggregate_dummy _null_ _null_ _null_ ));
DESCR("aggregate input into a json object");
DATA(insert OID = 3198 ( json_build_array PGNSP PGUID 12 1 0 2276 0 f f f f f f i 1 0 114 "2276" "{2276}" "{v}" _null_ _null_ json_build_array _null_ _null_ _null_ ));
DESCR("build a json array from any inputs");
DATA(insert OID = 3199 ( json_build_array PGNSP PGUID 12 1 0 0 0 f f f f f f i 0 0 114 "" _null_ _null_ _null_ _null_ json_build_array_noargs _null_ _null_ _null_ ));
DESCR("build an empty json array");
DATA(insert OID = 3200 ( json_build_object PGNSP PGUID 12 1 0 2276 0 f f f f f f i 1 0 114 "2276" "{2276}" "{v}" _null_ _null_ json_build_object _null_ _null_ _null_ ));
DESCR("build a json object from pairwise key/value inputs");
DATA(insert OID = 3201 ( json_build_object PGNSP PGUID 12 1 0 0 0 f f f f f f i 0 0 114 "" _null_ _null_ _null_ _null_ json_build_object_noargs _null_ _null_ _null_ ));
DESCR("build an empty json object");
DATA(insert OID = 3202 ( json_object PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 114 "1009" _null_ _null_ _null_ _null_ json_object _null_ _null_ _null_ ));
DESCR("map text arrayof key value pais to json object");
DATA(insert OID = 3203 ( json_object PGNSP PGUID 12 1 0 0 0 f f f f t f s 2 0 114 "1009 1009" _null_ _null_ _null_ _null_ json_object_two_arg _null_ _null_ _null_ ));
DESCR("map text arrayof key value pais to json object");
DATA(insert OID = 3176 ( to_json PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 114 "2283" _null_ _null_ _null_ _null_ to_json _null_ _null_ _null_ )); DATA(insert OID = 3176 ( to_json PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 114 "2283" _null_ _null_ _null_ _null_ to_json _null_ _null_ _null_ ));
DESCR("map input to json"); DESCR("map input to json");
@ -4161,6 +4179,10 @@ DATA(insert OID = 3960 ( json_populate_record PGNSP PGUID 12 1 0 0 0 f f f f
DESCR("get record fields from a json object"); DESCR("get record fields from a json object");
DATA(insert OID = 3961 ( json_populate_recordset PGNSP PGUID 12 1 100 0 0 f f f f f t s 3 0 2283 "2283 114 16" _null_ _null_ _null_ _null_ json_populate_recordset _null_ _null_ _null_ )); DATA(insert OID = 3961 ( json_populate_recordset PGNSP PGUID 12 1 100 0 0 f f f f f t s 3 0 2283 "2283 114 16" _null_ _null_ _null_ _null_ json_populate_recordset _null_ _null_ _null_ ));
DESCR("get set of records with fields from a json array of objects"); DESCR("get set of records with fields from a json array of objects");
DATA(insert OID = 3204 ( json_to_record PGNSP PGUID 12 1 0 0 0 f f f f f f s 2 0 2249 "114 16" _null_ _null_ _null_ _null_ json_to_record _null_ _null_ _null_ ));
DESCR("get record fields from a json object");
DATA(insert OID = 3205 ( json_to_recordset PGNSP PGUID 12 1 100 0 0 f f f f f t s 2 0 2249 "114 16" _null_ _null_ _null_ _null_ json_to_recordset _null_ _null_ _null_ ));
DESCR("get set of records with fields from a json array of objects");
DATA(insert OID = 3968 ( json_typeof PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 25 "114" _null_ _null_ _null_ _null_ json_typeof _null_ _null_ _null_ )); DATA(insert OID = 3968 ( json_typeof PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 25 "114" _null_ _null_ _null_ _null_ json_typeof _null_ _null_ _null_ ));
DESCR("get the type of a json value"); DESCR("get the type of a json value");

13
src/include/utils/json.h
View File

@ -31,6 +31,17 @@ extern Datum to_json(PG_FUNCTION_ARGS);
extern Datum json_agg_transfn(PG_FUNCTION_ARGS); extern Datum json_agg_transfn(PG_FUNCTION_ARGS);
extern Datum json_agg_finalfn(PG_FUNCTION_ARGS); extern Datum json_agg_finalfn(PG_FUNCTION_ARGS);
extern Datum json_object_agg_finalfn(PG_FUNCTION_ARGS);
extern Datum json_object_agg_transfn(PG_FUNCTION_ARGS);
extern Datum json_build_object(PG_FUNCTION_ARGS);
extern Datum json_build_object_noargs(PG_FUNCTION_ARGS);
extern Datum json_build_array(PG_FUNCTION_ARGS);
extern Datum json_build_array_noargs(PG_FUNCTION_ARGS);
extern Datum json_object(PG_FUNCTION_ARGS);
extern Datum json_object_two_arg(PG_FUNCTION_ARGS);
extern void escape_json(StringInfo buf, const char *str); extern void escape_json(StringInfo buf, const char *str);
extern Datum json_typeof(PG_FUNCTION_ARGS); extern Datum json_typeof(PG_FUNCTION_ARGS);
@ -49,5 +60,7 @@ extern Datum json_each_text(PG_FUNCTION_ARGS);
extern Datum json_array_elements(PG_FUNCTION_ARGS); extern Datum json_array_elements(PG_FUNCTION_ARGS);
extern Datum json_populate_record(PG_FUNCTION_ARGS); extern Datum json_populate_record(PG_FUNCTION_ARGS);
extern Datum json_populate_recordset(PG_FUNCTION_ARGS); extern Datum json_populate_recordset(PG_FUNCTION_ARGS);
extern Datum json_to_record(PG_FUNCTION_ARGS);
extern Datum json_to_recordset(PG_FUNCTION_ARGS);
#endif /* JSON_H */ #endif /* JSON_H */

126
src/test/regress/expected/json.out
View File

@ -991,3 +991,129 @@ select value, json_typeof(value)
| |
(11 rows) (11 rows)
-- json_build_array, json_build_object, json_object_agg
SELECT json_build_array('a',1,'b',1.2,'c',true,'d',null,'e',json '{"x": 3, "y": [1,2,3]}');
json_build_array
-----------------------------------------------------------------------
["a", 1, "b", 1.2, "c", true, "d", null, "e", {"x": 3, "y": [1,2,3]}]
(1 row)
SELECT json_build_object('a',1,'b',1.2,'c',true,'d',null,'e',json '{"x": 3, "y": [1,2,3]}');
json_build_object
----------------------------------------------------------------------------
{"a" : 1, "b" : 1.2, "c" : true, "d" : null, "e" : {"x": 3, "y": [1,2,3]}}
(1 row)
SELECT json_build_object(
'a', json_build_object('b',false,'c',99),
'd', json_build_object('e',array[9,8,7]::int[],
'f', (select row_to_json(r) from ( select relkind, oid::regclass as name from pg_class where relname = 'pg_class') r)));
json_build_object
-------------------------------------------------------------------------------------------------
{"a" : {"b" : false, "c" : 99}, "d" : {"e" : [9,8,7], "f" : {"relkind":"r","name":"pg_class"}}}
(1 row)
-- empty objects/arrays
SELECT json_build_array();
json_build_array
------------------
[]
(1 row)
SELECT json_build_object();
json_build_object
-------------------
{}
(1 row)
-- make sure keys are quoted
SELECT json_build_object(1,2);
json_build_object
-------------------
{"1" : 2}
(1 row)
-- keys must be scalar and not null
SELECT json_build_object(null,2);
ERROR: arg 1: key cannot be null
SELECT json_build_object(r,2) FROM (SELECT 1 AS a, 2 AS b) r;
ERROR: key value must be scalar, not array, composite or json
SELECT json_build_object(json '{"a":1,"b":2}', 3);
ERROR: key value must be scalar, not array, composite or json
SELECT json_build_object('{1,2,3}'::int[], 3);
ERROR: key value must be scalar, not array, composite or json
CREATE TEMP TABLE foo (serial_num int, name text, type text);
INSERT INTO foo VALUES (847001,'t15','GE1043');
INSERT INTO foo VALUES (847002,'t16','GE1043');
INSERT INTO foo VALUES (847003,'sub-alpha','GESS90');
SELECT json_build_object('turbines',json_object_agg(serial_num,json_build_object('name',name,'type',type)))
FROM foo;
json_build_object
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
{"turbines" : { "847001" : {"name" : "t15", "type" : "GE1043"}, "847002" : {"name" : "t16", "type" : "GE1043"}, "847003" : {"name" : "sub-alpha", "type" : "GESS90"} }}
(1 row)
-- json_object
-- one dimension
SELECT json_object('{a,1,b,2,3,NULL,"d e f","a b c"}');
json_object
-------------------------------------------------------
{"a" : "1", "b" : "2", "3" : null, "d e f" : "a b c"}
(1 row)
-- same but with two dimensions
SELECT json_object('{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}');
json_object
-------------------------------------------------------
{"a" : "1", "b" : "2", "3" : null, "d e f" : "a b c"}
(1 row)
-- odd number error
SELECT json_object('{a,b,c}');
ERROR: array must have even number of elements
-- one column error
SELECT json_object('{{a},{b}}');
ERROR: array must have two columns
-- too many columns error
SELECT json_object('{{a,b,c},{b,c,d}}');
ERROR: array must have two columns
-- too many dimensions error
SELECT json_object('{{{a,b},{c,d}},{{b,c},{d,e}}}');
ERROR: wrong number of array subscripts
--two argument form of json_object
select json_object('{a,b,c,"d e f"}','{1,2,3,"a b c"}');
json_object
------------------------------------------------------
{"a" : "1", "b" : "2", "c" : "3", "d e f" : "a b c"}
(1 row)
-- too many dimensions
SELECT json_object('{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}', '{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}');
ERROR: wrong number of array subscripts
-- mismatched dimensions
select json_object('{a,b,c,"d e f",g}','{1,2,3,"a b c"}');
ERROR: mismatched array dimensions
select json_object('{a,b,c,"d e f"}','{1,2,3,"a b c",g}');
ERROR: mismatched array dimensions
-- null key error
select json_object('{a,b,NULL,"d e f"}','{1,2,3,"a b c"}');
ERROR: null value not allowed for object key
-- empty key error
select json_object('{a,b,"","d e f"}','{1,2,3,"a b c"}');
ERROR: empty value not allowed for object key
-- json_to_record and json_to_recordset
select * from json_to_record('{"a":1,"b":"foo","c":"bar"}',true)
as x(a int, b text, d text);
a | b | d
---+-----+---
1 | foo |
(1 row)
select * from json_to_recordset('[{"a":1,"b":"foo","d":false},{"a":2,"b":"bar","c":true}]',false)
as x(a int, b text, c boolean);
a | b | c
---+-----+---
1 | foo |
2 | bar | t
(2 rows)

126
src/test/regress/expected/json_1.out
View File

@ -987,3 +987,129 @@ select value, json_typeof(value)
| |
(11 rows) (11 rows)
-- json_build_array, json_build_object, json_object_agg
SELECT json_build_array('a',1,'b',1.2,'c',true,'d',null,'e',json '{"x": 3, "y": [1,2,3]}');
json_build_array
-----------------------------------------------------------------------
["a", 1, "b", 1.2, "c", true, "d", null, "e", {"x": 3, "y": [1,2,3]}]
(1 row)
SELECT json_build_object('a',1,'b',1.2,'c',true,'d',null,'e',json '{"x": 3, "y": [1,2,3]}');
json_build_object
----------------------------------------------------------------------------
{"a" : 1, "b" : 1.2, "c" : true, "d" : null, "e" : {"x": 3, "y": [1,2,3]}}
(1 row)
SELECT json_build_object(
'a', json_build_object('b',false,'c',99),
'd', json_build_object('e',array[9,8,7]::int[],
'f', (select row_to_json(r) from ( select relkind, oid::regclass as name from pg_class where relname = 'pg_class') r)));
json_build_object
-------------------------------------------------------------------------------------------------
{"a" : {"b" : false, "c" : 99}, "d" : {"e" : [9,8,7], "f" : {"relkind":"r","name":"pg_class"}}}
(1 row)
-- empty objects/arrays
SELECT json_build_array();
json_build_array
------------------
[]
(1 row)
SELECT json_build_object();
json_build_object
-------------------
{}
(1 row)
-- make sure keys are quoted
SELECT json_build_object(1,2);
json_build_object
-------------------
{"1" : 2}
(1 row)
-- keys must be scalar and not null
SELECT json_build_object(null,2);
ERROR: arg 1: key cannot be null
SELECT json_build_object(r,2) FROM (SELECT 1 AS a, 2 AS b) r;
ERROR: key value must be scalar, not array, composite or json
SELECT json_build_object(json '{"a":1,"b":2}', 3);
ERROR: key value must be scalar, not array, composite or json
SELECT json_build_object('{1,2,3}'::int[], 3);
ERROR: key value must be scalar, not array, composite or json
CREATE TEMP TABLE foo (serial_num int, name text, type text);
INSERT INTO foo VALUES (847001,'t15','GE1043');
INSERT INTO foo VALUES (847002,'t16','GE1043');
INSERT INTO foo VALUES (847003,'sub-alpha','GESS90');
SELECT json_build_object('turbines',json_object_agg(serial_num,json_build_object('name',name,'type',type)))
FROM foo;
json_build_object
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
{"turbines" : { "847001" : {"name" : "t15", "type" : "GE1043"}, "847002" : {"name" : "t16", "type" : "GE1043"}, "847003" : {"name" : "sub-alpha", "type" : "GESS90"} }}
(1 row)
-- json_object
-- one dimension
SELECT json_object('{a,1,b,2,3,NULL,"d e f","a b c"}');
json_object
-------------------------------------------------------
{"a" : "1", "b" : "2", "3" : null, "d e f" : "a b c"}
(1 row)
-- same but with two dimensions
SELECT json_object('{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}');
json_object
-------------------------------------------------------
{"a" : "1", "b" : "2", "3" : null, "d e f" : "a b c"}
(1 row)
-- odd number error
SELECT json_object('{a,b,c}');
ERROR: array must have even number of elements
-- one column error
SELECT json_object('{{a},{b}}');
ERROR: array must have two columns
-- too many columns error
SELECT json_object('{{a,b,c},{b,c,d}}');
ERROR: array must have two columns
-- too many dimensions error
SELECT json_object('{{{a,b},{c,d}},{{b,c},{d,e}}}');
ERROR: wrong number of array subscripts
--two argument form of json_object
select json_object('{a,b,c,"d e f"}','{1,2,3,"a b c"}');
json_object
------------------------------------------------------
{"a" : "1", "b" : "2", "c" : "3", "d e f" : "a b c"}
(1 row)
-- too many dimensions
SELECT json_object('{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}', '{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}');
ERROR: wrong number of array subscripts
-- mismatched dimensions
select json_object('{a,b,c,"d e f",g}','{1,2,3,"a b c"}');
ERROR: mismatched array dimensions
select json_object('{a,b,c,"d e f"}','{1,2,3,"a b c",g}');
ERROR: mismatched array dimensions
-- null key error
select json_object('{a,b,NULL,"d e f"}','{1,2,3,"a b c"}');
ERROR: null value not allowed for object key
-- empty key error
select json_object('{a,b,"","d e f"}','{1,2,3,"a b c"}');
ERROR: empty value not allowed for object key
-- json_to_record and json_to_recordset
select * from json_to_record('{"a":1,"b":"foo","c":"bar"}',true)
as x(a int, b text, d text);
a | b | d
---+-----+---
1 | foo |
(1 row)
select * from json_to_recordset('[{"a":1,"b":"foo","d":false},{"a":2,"b":"bar","c":true}]',false)
as x(a int, b text, c boolean);
a | b | c
---+-----+---
1 | foo |
2 | bar | t
(2 rows)

87
src/test/regress/sql/json.sql
View File

@ -325,3 +325,90 @@ select value, json_typeof(value)
(json '{}'), (json '{}'),
(NULL::json)) (NULL::json))
as data(value); as data(value);
-- json_build_array, json_build_object, json_object_agg
SELECT json_build_array('a',1,'b',1.2,'c',true,'d',null,'e',json '{"x": 3, "y": [1,2,3]}');
SELECT json_build_object('a',1,'b',1.2,'c',true,'d',null,'e',json '{"x": 3, "y": [1,2,3]}');
SELECT json_build_object(
'a', json_build_object('b',false,'c',99),
'd', json_build_object('e',array[9,8,7]::int[],
'f', (select row_to_json(r) from ( select relkind, oid::regclass as name from pg_class where relname = 'pg_class') r)));
-- empty objects/arrays
SELECT json_build_array();
SELECT json_build_object();
-- make sure keys are quoted
SELECT json_build_object(1,2);
-- keys must be scalar and not null
SELECT json_build_object(null,2);
SELECT json_build_object(r,2) FROM (SELECT 1 AS a, 2 AS b) r;
SELECT json_build_object(json '{"a":1,"b":2}', 3);
SELECT json_build_object('{1,2,3}'::int[], 3);
CREATE TEMP TABLE foo (serial_num int, name text, type text);
INSERT INTO foo VALUES (847001,'t15','GE1043');
INSERT INTO foo VALUES (847002,'t16','GE1043');
INSERT INTO foo VALUES (847003,'sub-alpha','GESS90');
SELECT json_build_object('turbines',json_object_agg(serial_num,json_build_object('name',name,'type',type)))
FROM foo;
-- json_object
-- one dimension
SELECT json_object('{a,1,b,2,3,NULL,"d e f","a b c"}');
-- same but with two dimensions
SELECT json_object('{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}');
-- odd number error
SELECT json_object('{a,b,c}');
-- one column error
SELECT json_object('{{a},{b}}');
-- too many columns error
SELECT json_object('{{a,b,c},{b,c,d}}');
-- too many dimensions error
SELECT json_object('{{{a,b},{c,d}},{{b,c},{d,e}}}');
--two argument form of json_object
select json_object('{a,b,c,"d e f"}','{1,2,3,"a b c"}');
-- too many dimensions
SELECT json_object('{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}', '{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}');
-- mismatched dimensions
select json_object('{a,b,c,"d e f",g}','{1,2,3,"a b c"}');
select json_object('{a,b,c,"d e f"}','{1,2,3,"a b c",g}');
-- null key error
select json_object('{a,b,NULL,"d e f"}','{1,2,3,"a b c"}');
-- empty key error
select json_object('{a,b,"","d e f"}','{1,2,3,"a b c"}');
-- json_to_record and json_to_recordset
select * from json_to_record('{"a":1,"b":"foo","c":"bar"}',true)
as x(a int, b text, d text);
select * from json_to_recordset('[{"a":1,"b":"foo","d":false},{"a":2,"b":"bar","c":true}]',false)
as x(a int, b text, c boolean);