diesel-oci 0.2.0

A oci database adapter for diesel
Documentation 
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

use std::rc::Rc;

use crate::oracle::backend::Oracle;
use diesel::row::{self, Row, RowIndex, RowSealed};

use super::oracle_value::OracleValue;

pub struct OciRow {
    row: InnerOciRow,
    column_infos: Rc<Vec<oracle::ColumnInfo>>,
}

enum InnerOciRow {
    Row(oracle::Row),
    Values(Vec<Option<OracleValue<'static>>>),
}

impl OciRow {
    pub fn new(row: oracle::Row, column_infos: Rc<Vec<oracle::ColumnInfo>>) -> Self {
        OciRow {
            row: InnerOciRow::Row(row),
            column_infos,
        }
    }

    pub fn new_from_value(values: Vec<Option<OracleValue<'static>>>) -> Self {
        Self {
            row: InnerOciRow::Values(values),
            column_infos: Rc::new(Vec::new()),
        }
    }
}

impl RowIndex<usize> for OciRow {
    fn idx(&self, idx: usize) -> Option<usize> {
        if idx < self.row.len() {
            Some(idx)
        } else {
            None
        }
    }
}

impl<'a> RowIndex<&'a str> for OciRow {
    fn idx(&self, field_name: &'a str) -> Option<usize> {
        self.column_infos
            .iter()
            .enumerate()
            .find(|(_, c)| c.name() == field_name)
            .map(|(idx, _)| idx)
    }
}

impl RowSealed for OciRow {}

impl<'a> Row<'a, Oracle> for OciRow {
    type InnerPartialRow = Self;
    type Field<'f> = OciField<'f>
    where
        'a: 'f,
        Self: 'f;

    fn field_count(&self) -> usize {
        self.row.len()
    }

    fn get<'row, I>(&'row self, idx: I) -> Option<OciField<'row>>
    where
        'a: 'row,
        Self: diesel::row::RowIndex<I>,
    {
        let idx = self.idx(idx)?;
        Some(OciField {
            field_value: self.row.value_at(idx, &self.column_infos),
            column_info: self.column_infos.get(idx),
        })
    }

    fn partial_row(
        &self,
        range: std::ops::Range<usize>,
    ) -> diesel::row::PartialRow<Self::InnerPartialRow> {
        diesel::row::PartialRow::new(self, range)
    }
}

pub struct OciField<'a> {
    field_value: Option<OracleValue<'a>>,
    column_info: Option<&'a oracle::ColumnInfo>,
}

impl<'a> row::Field<'a, Oracle> for OciField<'a> {
    fn field_name(&self) -> Option<&'a str> {
        self.column_info.map(|c| c.name())
    }

    fn value(&self) -> Option<OracleValue<'_>> {
        self.field_value.clone()
    }

    fn is_null(&self) -> bool {
        self.field_value.is_none()
    }
}

impl InnerOciRow {
    fn value_at(&self, idx: usize, col_infos: &[oracle::ColumnInfo]) -> Option<OracleValue<'_>> {
        match self {
            InnerOciRow::Row(row) => {
                let sql = &row.sql_values()[idx];
                if sql.is_null().unwrap_or(true) {
                    None
                } else {
                    let tpe = col_infos[idx].oracle_type().clone();
                    Some(OracleValue::new(sql, tpe))
                }
            }
            InnerOciRow::Values(ref v) => v[idx].clone(),
        }
    }

    fn len(&self) -> usize {
        match self {
            InnerOciRow::Row(row) => row.sql_values().len(),
            InnerOciRow::Values(v) => v.len(),
        }
    }
}