diesel/mysql/types/
json.rs

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1use crate::deserialize::{self, FromSql};
2use crate::mysql::{Mysql, MysqlValue};
3use crate::serialize::{self, IsNull, Output, ToSql};
4use crate::sql_types;
5
6#[cfg(all(feature = "mysql_backend", feature = "serde_json"))]
7impl FromSql<sql_types::Json, Mysql> for serde_json::Value {
8    fn from_sql(value: MysqlValue<'_>) -> deserialize::Result<Self> {
9        serde_json::from_slice(value.as_bytes()).map_err(|_| "Invalid Json".into())
10    }
11}
12
13#[cfg(all(feature = "mysql_backend", feature = "serde_json"))]
14impl ToSql<sql_types::Json, Mysql> for serde_json::Value {
15    fn to_sql<'b>(&'b self, out: &mut Output<'b, '_, Mysql>) -> serialize::Result {
16        serde_json::to_writer(out, self)
17            .map(|_| IsNull::No)
18            .map_err(Into::into)
19    }
20}
21
22#[test]
23fn json_to_sql() {
24    use crate::query_builder::bind_collector::ByteWrapper;
25
26    let mut buffer = Vec::new();
27    let mut bytes = Output::test(ByteWrapper(&mut buffer));
28    let test_json = serde_json::Value::Bool(true);
29    ToSql::<sql_types::Json, Mysql>::to_sql(&test_json, &mut bytes).unwrap();
30    assert_eq!(buffer, b"true");
31}
32
33#[test]
34fn some_json_from_sql() {
35    use crate::mysql::MysqlType;
36    let input_json = b"true";
37    let output_json: serde_json::Value = FromSql::<sql_types::Json, Mysql>::from_sql(
38        MysqlValue::new_internal(input_json, MysqlType::String),
39    )
40    .unwrap();
41    assert_eq!(output_json, serde_json::Value::Bool(true));
42}
43
44#[test]
45fn bad_json_from_sql() {
46    use crate::mysql::MysqlType;
47    let uuid: Result<serde_json::Value, _> = FromSql::<sql_types::Json, Mysql>::from_sql(
48        MysqlValue::new_internal(b"boom", MysqlType::String),
49    );
50    assert_eq!(uuid.unwrap_err().to_string(), "Invalid Json");
51}
52
53#[test]
54fn no_json_from_sql() {
55    let uuid: Result<serde_json::Value, _> =
56        FromSql::<sql_types::Json, Mysql>::from_nullable_sql(None);
57    assert_eq!(
58        uuid.unwrap_err().to_string(),
59        "Unexpected null for non-null column"
60    );
61}
diesel/mysql/types/json.rs

diesel/mysql/types/
json.rs
