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This is used to demonstrate the use of JSON parameter values with
SQL prepared statements.
create table t1(j json);
set @int=123;
set @dec=3.14;
set @flt=3.14E1;
set @intstr='123';
set @quotint='"123"';
set @decstr='3.14';
set @fltstr='3.14E1';
set @strstr='xyz';
set @quotstr='"xyz"';
set @ts='2010-12-01 18:44:25';
set @null=null;
set @json='{"int" : 123, "dec" : 3.14, "flt" : 3.14E1, "str" : "xyz", "array" : [1, 2, 4]}';
Parameters are treated slightly different when they are resolved as being
of type JSON compared to when they are CAST as type JSON. The following
two prepared statements are used to demonstrate this:
prepare ps_insert from 'insert into t1 values (?)';
prepare ps_insert_cast from 'insert into t1 values (cast(? as json))';
The ps_insert statement fails with integer, decimal, float and datetime
values because Field_json::store() is not implemented for such values.
Integer parameter: With CAST, the integer value is converted to a
scalar JSON value, without cast the parameter is rejected as invald JSON.
execute ps_insert_cast using @int;
prepare ps_insert from 'insert into t1 values (?)';
execute ps_insert using @int;
ERROR 22032: Invalid JSON text: "not a JSON text, may need CAST" at position 0 in value for column 't1.j'.
Decimal parameter: With CAST, the decimal value is converted to a
scalar JSON value, without cast the parameter is rejected as invald JSON.
execute ps_insert_cast using @dec;
prepare ps_insert from 'insert into t1 values (?)';
execute ps_insert using @dec;
ERROR 22032: Invalid JSON text: "not a JSON text, may need CAST" at position 0 in value for column 't1.j'.
Float parameter: With CAST, the float value is converted to a
scalar JSON value, without cast the parameter is rejected as invald JSON.
execute ps_insert_cast using @flt;
prepare ps_insert from 'insert into t1 values (?)';
execute ps_insert using @flt;
ERROR 22032: Invalid JSON text: "not a JSON text, may need CAST" at position 0 in value for column 't1.j'.
String parameter containing an integer: Both statements accept the
parameter as a scalar JSON value.
execute ps_insert_cast using @intstr;
prepare ps_insert from 'insert into t1 values (?)';
execute ps_insert using @intstr;
String parameter containing a decimal: Both statements accept the
parameter as a scalar JSON value.
execute ps_insert_cast using @decstr;
prepare ps_insert from 'insert into t1 values (?)';
execute ps_insert using @decstr;
String parameter containing a float: Both statements accept the
parameter as a scalar JSON value.
execute ps_insert_cast using @fltstr;
prepare ps_insert from 'insert into t1 values (?)';
execute ps_insert using @fltstr;
String parameter containing a non-quoted string: None of the statements
will recognize this:
execute ps_insert_cast using @strstr;
ERROR 22032: Invalid JSON text in argument 1 to function cast_as_json: "Invalid value." at position 0.
prepare ps_insert from 'insert into t1 values (?)';
execute ps_insert using @strstr;
ERROR 22032: Invalid JSON text: "Invalid value." at position 0 in value for column 't1.j'.
String parameter containing a quoted string: Both statements accept
the parameter as a scalar JSON value.
execute ps_insert_cast using @quotstr;
prepare ps_insert from 'insert into t1 values (?)';
execute ps_insert using @quotstr;
String parameter containing a timestamp literal: None of the statements
will recognize this:
execute ps_insert_cast using @ts;
ERROR 22032: Invalid JSON text in argument 1 to function cast_as_json: "The document root must not be followed by other values." at position 4.
prepare ps_insert from 'insert into t1 values (?)';
execute ps_insert using @ts;
ERROR 22032: Invalid JSON text: "The document root must not be followed by other values." at position 4 in value for column 't1.j'.
Parameter that is a NULL value: accepted with both statements:
execute ps_insert_cast using @null;
prepare ps_insert from 'insert into t1 values (?)';
execute ps_insert using @null;
String parameter that is a JSON object: accepted with both statements:
execute ps_insert_cast using @json;
prepare ps_insert from 'insert into t1 values (?)';
execute ps_insert using @json;
DEALLOCATE PREPARE ps_insert_cast;
DEALLOCATE PREPARE ps_insert;
SELECT * FROM t1;
j
123
3.14
31.4
123
123
3.14
3.14
31.4
31.4
"xyz"
"xyz"
NULL
NULL
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
Compare JSON expressions with JSON parameters.
First using regular syntax.
prepare ps_get_int from "select * from t1 where json_extract(j, '$.int') = ?";
prepare ps_get_dec from "select * from t1 where json_extract(j, '$.dec') = ?";
prepare ps_get_flt from "select * from t1 where json_extract(j, '$.flt') = ?";
prepare ps_get_str from "select * from t1 where json_extract(j, '$.str') = ?";
execute ps_get_int using @int;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_int using @intstr;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_dec using @dec;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_dec using @decstr;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_flt using @flt;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_flt using @fltstr;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_str using @strstr;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_str using @quotstr;
j
DEALLOCATE PREPARE ps_get_int;
DEALLOCATE PREPARE ps_get_flt;
DEALLOCATE PREPARE ps_get_dec;
DEALLOCATE PREPARE ps_get_str;
Repeat comparison operations using "->" operator. Results should be same.
prepare ps_get_int from "select * from t1 where j->'$.int' = ?";
prepare ps_get_dec from "select * from t1 where j->'$.dec' = ?";
prepare ps_get_flt from "select * from t1 where j->'$.flt' = ?";
prepare ps_get_str from "select * from t1 where j->'$.str' = ?";
execute ps_get_int using @int;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_int using @intstr;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_dec using @dec;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_dec using @decstr;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_flt using @flt;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_flt using @fltstr;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_str using @intstr;
j
execute ps_get_str using @strstr;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_str using @quotstr;
j
DEALLOCATE PREPARE ps_get_int;
DEALLOCATE PREPARE ps_get_flt;
DEALLOCATE PREPARE ps_get_dec;
DEALLOCATE PREPARE ps_get_str;
Repeat comparison operations using "->>" operator, ie return an unquoted
value from json_extract(). All executions succeed, since the value from
json_extract() is converted to a character string, which can be compared
to the parameter value. However, using @quotstr finds no rows.
prepare ps_get_int from "select * from t1 where j->>'$.int' = ?";
prepare ps_get_dec from "select * from t1 where j->>'$.dec' = ?";
prepare ps_get_flt from "select * from t1 where j->>'$.flt' = ?";
prepare ps_get_str from "select * from t1 where j->>'$.str' = ?";
execute ps_get_int using @int;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_int using @intstr;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_dec using @dec;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_dec using @decstr;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_flt using @flt;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_flt using @fltstr;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_str using @strstr;
j
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
{"dec": 3.14, "flt": 31.4, "int": 123, "str": "xyz", "array": [1, 2, 4]}
execute ps_get_str using @quotstr;
j
DEALLOCATE PREPARE ps_get_int;
DEALLOCATE PREPARE ps_get_flt;
DEALLOCATE PREPARE ps_get_dec;
DEALLOCATE PREPARE ps_get_str;
DROP TABLE t1;
# Bug#31433168: Infinite recursion when evaluating parameter
PREPARE ps FROM 'SELECT CAST(? AS JSON)';
EXECUTE ps USING @undefined_variable;
CAST(? AS JSON)
NULL
SET @var = '{"a" : 1}';
EXECUTE ps USING @var;
CAST(? AS JSON)
{"a": 1}
EXECUTE ps USING @undefined_variable;
CAST(? AS JSON)
NULL
DEALLOCATE PREPARE ps;
# Bug#31406724: Crash in sql_scalar_to_json after many recursive calls
CREATE TABLE t(a INTEGER);
INSERT INTO t VALUES (0),(1),(2);
PREPARE s FROM 'SELECT * FROM t WHERE JSON_LENGTH(?, a BETWEEN ? AND ?)';
EXECUTE s USING @undefined_variable, @undefined_variable, @undefined_variable;
a
DEALLOCATE PREPARE s;
DROP TABLE t;
# Bug#31667405: Incorrect prepared statement outcome with numeric strings in JSON
PREPARE ps FROM 'SELECT CAST(''"123"'' AS JSON) = JSON_EXTRACT(?, ''$'')';
EXECUTE ps USING @intstr;
CAST('"123"' AS JSON) = JSON_EXTRACT(?, '$')
0
EXECUTE ps USING @quotint;
CAST('"123"' AS JSON) = JSON_EXTRACT(?, '$')
1
DEALLOCATE PREPARE ps;
PREPARE ps FROM 'SELECT CAST(''"123"'' AS JSON) IN (?, ?)';
EXECUTE ps USING @intstr, @intstr;
CAST('"123"' AS JSON) IN (?, ?)
1
EXECUTE ps USING @quotint, @quotint;
CAST('"123"' AS JSON) IN (?, ?)
0
DEALLOCATE PREPARE ps;
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