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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
require "sqlite3"
module Guff
class Database < ::SQLite3::Database
SQL = {
table_exists: "
SELECT tbl_name
FROM sqlite_master
WHERE type = 'table'
AND tbl_name = ?
",
}
# TODO (add table_exists?)
def table_exists?(table_name : String)
one(SQL[:table_exists], [table_name]) == table_name
end
def one(
sql : String
)
r = nil
bind(sql).execute do |rs|
if rs.next
# FIXME
r = rs[0]
end
end
# return result
r
end
def one(
sql : String,
args : Array(String)
)
r = nil
bind(sql, args).execute do |rs|
if rs.next
# FIXME
r = rs[0]
end
end
# return result
r
end
def one(
sql : String,
args : Hash(String, String),
)
r = nil
bind(sql, args).execute do |rs|
if rs.next
# FIXME
r = rs[0]
end
end
# return result
r
end
def row(sql : String)
r = nil
# exec query
bind(sql).execute do |rs|
if rs.next
r = to_row(rs)
end
end
# return result
r
end
def row(
sql : String,
args : Array(String)
)
r = nil
# exec query
bind(sql, args).execute do |rs|
if rs.next
r = to_row(rs)
end
end
# return result
r
end
def row(
sql : String,
args : Hash(String, String)
)
r = nil
# exec query
bind(sql, args).execute do |rs|
if rs.next
r = to_row(rs)
end
end
# return result
r
end
def all(
sql : String,
args : Array(String),
&block : Proc(Hash(String, ::SQLite3::Value), Nil) \
)
# build statement
bind(sql, args).execute do |rs|
# walk results
while rs.next
# build row and pass it to callback
block.call(to_row(rs))
end
end
nil
end
def all(
sql : String,
args : Hash(String, String),
&block : Proc(Hash(String, ::SQLite3::Value), Nil) \
)
bind(sql, args).execute do |rs|
# walk results
while rs.next
# build row and pass it to callback
block.call(to_row(rs))
end
end
# close statement, return nil
nil
end
def transaction(&block)
query("BEGIN")
block.call(self)
query("COMMIT")
end
private def bind(sql : String)
# build statement
prepare(sql)
end
private def bind(
sql : String,
args : Array(String)?
)
# build statement
st = prepare(sql)
# bind args
if args && args.size > 0
args.each_with_index do |val, i|
st[i + 1] = val
end
end
# return result
st
end
private def bind(
sql : String,
args : Hash(String, String)?
)
# build statement
st = prepare(sql)
# bind args
if args && args.size > 0
st[0] = args
end
# return result
st
end
private def to_row(rs : SQLite3::ResultSet) : Hash(String, ::SQLite3::Value)
0.upto(rs.column_count).inject(
{} of String => ::SQLite3::Value
) do |r, i|
r[rs.columns[i]] = r[i]
r
end
end
end
end
|
