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

extern crate byteorder;

use self::byteorder::{ReadBytesExt, WriteBytesExt, BigEndian};
use std::error::Error;
use std::io::Write;

use Queriable;
use super::option::UnexpectedNullError;
use types::{NativeSqlType, FromSql, ToSql, Array, IsNull};

impl<T: NativeSqlType> NativeSqlType for Array<T> {
    fn oid(&self) -> u32 {
        self.0.array_oid()
    }

    fn array_oid(&self) -> u32 {
        0
    }

    fn new() -> Self {
        Array(T::new())
    }
}

impl<T, ST> FromSql<Array<ST>> for Vec<T> where
    T: FromSql<ST>,
    ST: NativeSqlType,
{
    fn from_sql(bytes: Option<&[u8]>) -> Result<Self, Box<Error>> {
        let mut bytes = not_none!(bytes);
        let num_dimensions = try!(bytes.read_i32::<BigEndian>());
        let has_null = try!(bytes.read_i32::<BigEndian>()) != 0;
        let _oid = try!(bytes.read_i32::<BigEndian>());

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

        let num_elements = try!(bytes.read_i32::<BigEndian>());
        let lower_bound = try!(bytes.read_i32::<BigEndian>());

        assert!(num_dimensions == 1, "multi-dimensional arrays are not supported");
        assert!(lower_bound == 1, "lower bound must be 1");

        (0..num_elements).map(|_| {
            let elem_size = try!(bytes.read_i32::<BigEndian>());
            if has_null && elem_size == -1 {
                T::from_sql(None)
            } else {
                let (elem_bytes, new_bytes) = bytes.split_at(elem_size as usize);
                bytes = new_bytes;
                T::from_sql(Some(&elem_bytes))
            }
        }).collect()
    }
}

impl<T, ST> Queriable<Array<ST>> for Vec<T> where
    T: FromSql<ST> + Queriable<ST>,
    ST: NativeSqlType,
{
    type Row = Self;
    fn build(row: Self) -> Self {
        row
    }
}

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

impl<'a, ST, T> AsExpression<Array<ST>> for &'a [T] where
    ST: NativeSqlType,
    T: ToSql<ST>,
{
    type Expression = Bound<Array<ST>, Self>;

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

impl<ST, T> AsExpression<Array<ST>> for Vec<T> where
    ST: NativeSqlType,
    T: ToSql<ST>,
{
    type Expression = Bound<Array<ST>, Self>;

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

impl<'a, ST, T> AsExpression<Array<ST>> for &'a Vec<T> where
    ST: NativeSqlType,
    T: ToSql<ST>,
{
    type Expression = Bound<Array<ST>, Self>;

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

impl<'a, ST, T> ToSql<Array<ST>> for &'a [T] where
    ST: NativeSqlType,
    T: ToSql<ST>,
{
    fn to_sql<W: Write>(&self, out: &mut W) -> Result<IsNull, Box<Error>> {
        let num_dimensions = 1;
        try!(out.write_i32::<BigEndian>(num_dimensions));
        let flags = 0;
        try!(out.write_i32::<BigEndian>(flags));
        try!(out.write_u32::<BigEndian>(ST::new().oid()));
        try!(out.write_i32::<BigEndian>(self.len() as i32));
        let lower_bound = 1;
        try!(out.write_i32::<BigEndian>(lower_bound));

        let mut buffer = Vec::new();
        for elem in self.iter() {
            let is_null = try!(elem.to_sql(&mut buffer));
            assert!(is_null == IsNull::No, "Arrays containing null are not supported");
            try!(out.write_i32::<BigEndian>(buffer.len() as i32));
            try!(out.write_all(&buffer));
            buffer.clear();
        }

        Ok(IsNull::No)
    }
}

impl<ST, T> ToSql<Array<ST>> for Vec<T> where
    ST: NativeSqlType,
    T: ToSql<ST>,
{
    fn to_sql<W: Write>(&self, out: &mut W) -> Result<IsNull, Box<Error>> {
        (&self as &[T]).to_sql(out)
    }
}