1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
use byteorder::{NetworkEndian, ReadBytesExt, WriteBytesExt};
use std::fmt;
use std::io::Write;

use crate::deserialize::{self, FromSql};
use crate::pg::{Pg, PgMetadataLookup, PgTypeMetadata, PgValue};
use crate::serialize::{self, IsNull, Output, ToSql};
use crate::sql_types::{Array, HasSqlType, Nullable};

impl<T> HasSqlType<Array<T>> for Pg
where
    Pg: HasSqlType<T>,
{
    fn metadata(lookup: &PgMetadataLookup) -> PgTypeMetadata {
        PgTypeMetadata {
            oid: <Pg as HasSqlType<T>>::metadata(lookup).array_oid,
            array_oid: 0,
        }
    }
}

impl<T, ST> FromSql<Array<ST>, Pg> for Vec<T>
where
    T: FromSql<ST, Pg>,
{
    fn from_sql(value: PgValue<'_>) -> deserialize::Result<Self> {
        let mut bytes = value.as_bytes();
        let num_dimensions = bytes.read_i32::<NetworkEndian>()?;
        let has_null = bytes.read_i32::<NetworkEndian>()? != 0;
        let _oid = bytes.read_i32::<NetworkEndian>()?;

        if num_dimensions == 0 {
            return Ok(Vec::new());
        }

        let num_elements = bytes.read_i32::<NetworkEndian>()?;
        let _lower_bound = bytes.read_i32::<NetworkEndian>()?;

        if num_dimensions != 1 {
            return Err("multi-dimensional arrays are not supported".into());
        }

        (0..num_elements)
            .map(|_| {
                let elem_size = bytes.read_i32::<NetworkEndian>()?;
                if has_null && elem_size == -1 {
                    T::from_nullable_sql(None)
                } else {
                    let (elem_bytes, new_bytes) = bytes.split_at(elem_size as usize);
                    bytes = new_bytes;
                    T::from_sql(PgValue::new(elem_bytes, value.get_oid()))
                }
            })
            .collect()
    }
}

use crate::expression::bound::Bound;
use crate::expression::AsExpression;

macro_rules! array_as_expression {
    ($ty:ty, $sql_type:ty) => {
        impl<'a, 'b, ST, T> AsExpression<$sql_type> for $ty {
            type Expression = Bound<$sql_type, Self>;

            fn as_expression(self) -> Self::Expression {
                Bound::new(self)
            }
        }
    };
}

array_as_expression!(&'a [T], Array<ST>);
array_as_expression!(&'a [T], Nullable<Array<ST>>);
array_as_expression!(&'a &'b [T], Array<ST>);
array_as_expression!(&'a &'b [T], Nullable<Array<ST>>);
array_as_expression!(Vec<T>, Array<ST>);
array_as_expression!(Vec<T>, Nullable<Array<ST>>);
array_as_expression!(&'a Vec<T>, Array<ST>);
array_as_expression!(&'a Vec<T>, Nullable<Array<ST>>);
array_as_expression!(&'a &'b Vec<T>, Array<ST>);
array_as_expression!(&'a &'b Vec<T>, Nullable<Array<ST>>);

impl<ST, T> ToSql<Array<ST>, Pg> for [T]
where
    Pg: HasSqlType<ST>,
    T: ToSql<ST, Pg>,
{
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        let num_dimensions = 1;
        out.write_i32::<NetworkEndian>(num_dimensions)?;
        let flags = 0;
        out.write_i32::<NetworkEndian>(flags)?;
        let element_oid = Pg::metadata(out.metadata_lookup()).oid;
        out.write_u32::<NetworkEndian>(element_oid)?;
        out.write_i32::<NetworkEndian>(self.len() as i32)?;
        let lower_bound = 1;
        out.write_i32::<NetworkEndian>(lower_bound)?;

        let mut buffer = out.with_buffer(Vec::new());
        for elem in self.iter() {
            let is_null = elem.to_sql(&mut buffer)?;
            if let IsNull::No = is_null {
                out.write_i32::<NetworkEndian>(buffer.len() as i32)?;
                out.write_all(&buffer)?;
                buffer.clear();
            } else {
                // https://github.com/postgres/postgres/blob/82f8107b92c9104ec9d9465f3f6a4c6dab4c124a/src/backend/utils/adt/arrayfuncs.c#L1461
                out.write_i32::<NetworkEndian>(-1)?;
            }
        }

        Ok(IsNull::No)
    }
}

impl<ST, T> ToSql<Nullable<Array<ST>>, Pg> for [T]
where
    [T]: ToSql<Array<ST>, Pg>,
{
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        ToSql::<Array<ST>, Pg>::to_sql(self, out)
    }
}

impl<ST, T> ToSql<Array<ST>, Pg> for Vec<T>
where
    [T]: ToSql<Array<ST>, Pg>,
    T: fmt::Debug,
{
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        (self as &[T]).to_sql(out)
    }
}

impl<ST, T> ToSql<Nullable<Array<ST>>, Pg> for Vec<T>
where
    Vec<T>: ToSql<Array<ST>, Pg>,
{
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        ToSql::<Array<ST>, Pg>::to_sql(self, out)
    }
}