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|
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)
prepare(sql)
end
private def bind(
sql : String,
args : Array(String)?
)
# build statement
st = prepare(sql)
# build args
if 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
if args.size > 0
st = prepare(sql)
end
# bind args
st[0] = args
# 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
|
