Function json_array_1 

pub fn json_array_1<V1: NotBlob, value_1>(
    value_1: value_1,
) -> json_array_1<V1, value_1>
where
    value_1: AsExpression<V1>,

Available on crate feature sqlite only.

The json_array() SQL function accepts zero or more arguments and returns a well-formed JSON array that is composed from those arguments. Note that arguments of type BLOB will not be accepted by this function.

An argument with SQL type TEXT is normally converted into a quoted JSON string. However, if the argument is the output from another json function, then it is stored as JSON. This allows calls to json_array() and json_object() to be nested. The json() function can also be used to force strings to be recognized as JSON.

This function requires at least SQLite 3.38 or newer

Examples

let result = diesel::select(json_array_0()).get_result::<serde_json::Value>(connection)?;
assert_eq!(json!([]), result);

let result = diesel::select(json_array_1::<Text, _>("abc"))
    .get_result::<serde_json::Value>(connection)?;
assert_eq!(json!(["abc"]), result);

let result = diesel::select(json_array_2::<Text, Double, _, _>("abc", 3.1415))
    .get_result::<serde_json::Value>(connection)?;
assert_eq!(json!(["abc", 3.1415]), result);

Variadic functions

This function is variadic in SQL, so there’s a family of functions on a diesel side:

json_array_0, json_array_1, … json_array_n

Here, the postfix number indicates repetitions of variadic arguments. To use this function, the appropriate version with the correct argument count must be selected.

Controlling the generation of variadic function variants

By default, only variants with 0, 1, and 2 repetitions of variadic arguments are generated. To generate more variants, set the DIESEL_VARIADIC_FUNCTION_ARGS environment variable to the desired number of variants.

For a greater convenience this environment variable can also be set in a .cargo/config.toml file as described in the cargo documentation.