rust-postgres-array/src/impls.rs at master · psqlpy-python/rust-postgres-array · GitHub

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use fallible_iterator::FallibleIterator;

use postgres_protocol;

use postgres_protocol::types;

use postgres_types::{to_sql_checked, FromSql, IsNull, Kind, ToSql, Type};

use std::error::Error;

use crate::{Array, Dimension};

use postgres_types::private::BytesMut;

impl<'de, T> FromSql<'de> for Array<T>

where

T: FromSql<'de>,

{

fn from_sql(ty: &Type, raw: &'de [u8]) -> Result<Array<T>, Box<dyn Error + Sync + Send>> {

let element_type = match *ty.kind() {

Kind::Array(ref ty) => ty,

_ => unreachable!(),

};

let array = types::array_from_sql(raw)?;

let dimensions = array

.dimensions()

.map(|d| {

Ok(Dimension {

len: d.len,

lower_bound: d.lower_bound,

})

.collect()?;

let elements = array

.values()

.map(|v| FromSql::from_sql_nullable(element_type, v))

.collect()?;

Ok(Array::from_parts(elements, dimensions))

}

fn accepts(ty: &Type) -> bool {

match ty.kind() {

&Kind::Array(ref ty) => <T as FromSql>::accepts(ty),

_ => false,

}

impl<T> ToSql for Array<T>

where

T: ToSql,

{

fn to_sql(&self, ty: &Type, w: &mut BytesMut) -> Result<IsNull, Box<dyn Error + Sync + Send>> {

let element_type = match ty.kind() {

&Kind::Array(ref ty) => ty,

_ => unreachable!(),

};

let dimensions = self.dimensions().iter().map(|d| types::ArrayDimension {

len: d.len,

lower_bound: d.lower_bound,

});

let elements = self.iter();

types::array_to_sql(

dimensions,

element_type.oid(),

elements,

|v, w| match v.to_sql(element_type, w) {

Ok(IsNull::Yes) => Ok(postgres_protocol::IsNull::Yes),

Ok(IsNull::No) => Ok(postgres_protocol::IsNull::No),

Err(e) => Err(e),

)?;

Ok(IsNull::No)

}

fn accepts(ty: &Type) -> bool {

match ty.kind() {

&Kind::Array(ref ty) => <T as ToSql>::accepts(ty),

_ => false,

}

to_sql_checked!();

}

#[cfg(test)]

mod test {

use std::fmt;

use crate::Array;

use postgres::types::{FromSqlOwned, ToSql};

use postgres::{Client, NoTls};

fn test_type<T: PartialEq + FromSqlOwned + ToSql + Sync, S: fmt::Display>(

sql_type: &str,

checks: &[(T, S)],

) {

let mut conn = Client::connect("postgres://postgres:password@localhost", NoTls).unwrap();

for &(ref val, ref repr) in checks.iter() {

let result = conn

.query(&*format!("SELECT {}::{}", *repr, sql_type), &[])

.unwrap()[0]

.get(0);

assert!(val == &result);

let result = conn

.query(&*format!("SELECT $1::{}", sql_type), &[val])

.unwrap()[0]

.get(0);

assert!(val == &result);

}

macro_rules! test_array_params {

($name:expr, $v1:expr, $s1:expr, $v2:expr, $s2:expr, $v3:expr, $s3:expr) => {{

let tests = &[

(

Some(Array::from_vec(vec![Some($v1), Some($v2), None], 1)),

format!("'{{{},{},NULL}}'", $s1, $s2),

(None, "NULL".to_string()),

];

test_type(&format!("{}[]", $name), tests);

let mut a = Array::from_vec(vec![Some($v1), Some($v2)], 0);

a.wrap(-1);

a.push(Array::from_vec(vec![None, Some($v3)], 0));

let tests = &[(

Some(a),

format!("'[-1:0][0:1]={{{{{},{}}},{{NULL,{}}}}}'", $s1, $s2, $s3),

)];

test_type(&format!("{}[][]", $name), tests);

}};

}

#[test]

fn test_boolarray_params() {

test_array_params!("BOOL", false, "f", true, "t", true, "t");

}

#[test]

fn test_byteaarray_params() {

test_array_params!(

"BYTEA",

vec![0u8, 1],

r#""\\x0001""#,

vec![254u8, 255u8],

r#""\\xfeff""#,

vec![10u8, 11u8],

r#""\\x0a0b""#

);

}

#[test]

fn test_chararray_params() {

test_array_params!("\"char\"", 'a' as i8, "a", 'z' as i8, "z", '0' as i8, "0");

}

#[test]

fn test_namearray_params() {

test_array_params!(

"NAME",

"hello".to_string(),

"hello",

"world".to_string(),

"world",

"!".to_string(),

"!"

);

}

#[test]

fn test_int2array_params() {

test_array_params!("INT2", 0i16, "0", 1i16, "1", 2i16, "2");

}

#[test]

fn test_int4array_params() {

test_array_params!("INT4", 0i32, "0", 1i32, "1", 2i32, "2");

}

#[test]

fn test_textarray_params() {

test_array_params!(

"TEXT",

"hello".to_string(),

"hello",

"world".to_string(),

"world",

"!".to_string(),

"!"

);

}

#[test]

fn test_charnarray_params() {

test_array_params!(

"CHAR(5)",

"hello".to_string(),

"hello",

"world".to_string(),

"world",

"! ".to_string(),

"!"

);

}

#[test]

fn test_varchararray_params() {

test_array_params!(

"VARCHAR",

"hello".to_string(),

"hello",

"world".to_string(),

"world",

"!".to_string(),

"!"

);

}

#[test]

fn test_int8array_params() {

test_array_params!("INT8", 0i64, "0", 1i64, "1", 2i64, "2");

}

#[test]

fn test_float4array_params() {

test_array_params!("FLOAT4", 0f32, "0", 1.5f32, "1.5", 0.009f32, ".009");

}

#[test]

fn test_float8array_params() {

test_array_params!("FLOAT8", 0f64, "0", 1.5f64, "1.5", 0.009f64, ".009");

}

#[test]

fn test_empty_array() {

let mut conn = Client::connect("postgres://postgres@localhost", NoTls).unwrap();

conn.query("SELECT '{}'::INT4[]", &[]).unwrap()[0].get::<_, Array<i32>>(0);

}

rust-postgres-array/src/impls.rs at master · psqlpy-python/rust-postgres-array · GitHub

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