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
144
145
146
147
use std::collections::HashMap;
use super::{ffi, libc, Binds, Statement, StatementMetadata};
use mysql::{Mysql, MysqlType};
use result::QueryResult;
use row::*;
use sql_types::IsSigned;
pub struct StatementIterator<'a> {
stmt: &'a mut Statement,
output_binds: Binds,
}
#[allow(clippy::should_implement_trait)]
impl<'a> StatementIterator<'a> {
#[allow(clippy::new_ret_no_self)]
pub fn new(stmt: &'a mut Statement, types: Vec<(MysqlType, IsSigned)>) -> QueryResult<Self> {
let mut output_binds = Binds::from_output_types(types);
execute_statement(stmt, &mut output_binds)?;
Ok(StatementIterator {
stmt: stmt,
output_binds: output_binds,
})
}
pub fn map<F, T>(mut self, mut f: F) -> QueryResult<Vec<T>>
where
F: FnMut(MysqlRow) -> QueryResult<T>,
{
let mut results = Vec::new();
while let Some(row) = self.next() {
results.push(f(row?)?);
}
Ok(results)
}
fn next(&mut self) -> Option<QueryResult<MysqlRow>> {
match populate_row_buffers(self.stmt, &mut self.output_binds) {
Ok(Some(())) => Some(Ok(MysqlRow {
col_idx: 0,
binds: &mut self.output_binds,
})),
Ok(None) => None,
Err(e) => Some(Err(e)),
}
}
}
pub struct MysqlRow<'a> {
col_idx: usize,
binds: &'a Binds,
}
impl<'a> Row<Mysql> for MysqlRow<'a> {
fn take(&mut self) -> Option<&[u8]> {
let current_idx = self.col_idx;
self.col_idx += 1;
self.binds.field_data(current_idx)
}
fn next_is_null(&self, count: usize) -> bool {
(0..count).all(|i| self.binds.field_data(self.col_idx + i).is_none())
}
}
pub struct NamedStatementIterator<'a> {
stmt: &'a mut Statement,
output_binds: Binds,
metadata: StatementMetadata,
}
#[allow(clippy::should_implement_trait)]
impl<'a> NamedStatementIterator<'a> {
#[allow(clippy::new_ret_no_self)]
pub fn new(stmt: &'a mut Statement) -> QueryResult<Self> {
let metadata = stmt.metadata()?;
let mut output_binds = Binds::from_result_metadata(metadata.fields());
execute_statement(stmt, &mut output_binds)?;
Ok(NamedStatementIterator {
stmt,
output_binds,
metadata,
})
}
pub fn map<F, T>(mut self, mut f: F) -> QueryResult<Vec<T>>
where
F: FnMut(NamedMysqlRow) -> QueryResult<T>,
{
let mut results = Vec::new();
while let Some(row) = self.next() {
results.push(f(row?)?);
}
Ok(results)
}
fn next(&mut self) -> Option<QueryResult<NamedMysqlRow>> {
match populate_row_buffers(self.stmt, &mut self.output_binds) {
Ok(Some(())) => Some(Ok(NamedMysqlRow {
binds: &self.output_binds,
column_indices: self.metadata.column_indices(),
})),
Ok(None) => None,
Err(e) => Some(Err(e)),
}
}
}
pub struct NamedMysqlRow<'a> {
binds: &'a Binds,
column_indices: &'a HashMap<&'a str, usize>,
}
impl<'a> NamedRow<Mysql> for NamedMysqlRow<'a> {
fn index_of(&self, column_name: &str) -> Option<usize> {
self.column_indices.get(column_name).cloned()
}
fn get_raw_value(&self, idx: usize) -> Option<&[u8]> {
self.binds.field_data(idx)
}
}
fn execute_statement(stmt: &mut Statement, binds: &mut Binds) -> QueryResult<()> {
unsafe {
binds.with_mysql_binds(|bind_ptr| stmt.bind_result(bind_ptr))?;
stmt.execute()?;
}
Ok(())
}
fn populate_row_buffers(stmt: &Statement, binds: &mut Binds) -> QueryResult<Option<()>> {
let next_row_result = unsafe { ffi::mysql_stmt_fetch(stmt.stmt.as_ptr()) };
match next_row_result as libc::c_uint {
ffi::MYSQL_NO_DATA => Ok(None),
ffi::MYSQL_DATA_TRUNCATED => binds.populate_dynamic_buffers(stmt).map(Some),
0 => {
binds.update_buffer_lengths();
Ok(Some(()))
}
_error => stmt.did_an_error_occur().map(Some),
}
}