Class: DBI::DBD::SQLite3::Database

Inherits:
BaseDatabase show all
Defined in:
lib/dbd/sqlite3/database.rb

Overview

See DBI::BaseDatabase.

Instance Method Summary collapse

Methods inherited from BaseDatabase

#[], #do, #execute

Constructor Details

#initialize(dbname, attr) ⇒ Database

Constructor. Valid attributes:

  • AutoCommit: Commit after every statement execution.

The following attributes go directly to the low-level SQLite3 driver. Please consult it’s documentation for more information.

  • auto_vacuum

  • cache_size

  • default_cache_size

  • default_synchronous

  • default_temp_store

  • full_column_names

  • synchronous

  • temp_store

  • type_translation



23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
 
# File 'lib/dbd/sqlite3/database.rb', line 23

def initialize(dbname, attr)
    @db = ::SQLite3::Database.new(dbname)

    @db.type_translation = false

    @attr = {'AutoCommit' => true}
    if attr then
        attr.each_pair do |key, value|
            begin
                self[key] = value
            rescue DBI::NotSupportedError
            end
        end
    end
    __generate_attr__
end

Instance Method Details

#[]=(attr, value) ⇒ Object

See #new for valid attributes.

If Autocommit is set to true, commit happens immediately if a transaction is open.



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
 
# File 'lib/dbd/sqlite3/database.rb', line 171

def []=(attr, value)
    case attr
    when 'AutoCommit'
        if value
            @db.commit if @db.transaction_active?
        else
            @db.transaction unless @db.transaction_active?
        end
    @attr[attr] = value
    when 'auto_vacuum', 'cache_size', 'count_changes',
      'default_cache_size', 'encoding', 'full_column_names',
      'page_size', 'short_column_names', 'synchronous',
      'temp_store', 'temp_store_directory'
      @db.__send__((attr+'='), value)
        @attr[attr] = @db.__send__(attr)
    when 'busy_timeout'
        @db.busy_timeout(value)
        @attr[attr] = value
    when 'busy_handler'
        @db.busy_timeout(&value)
        @attr[attr] = value
    when 'type_translation'
        @db.type_translation = value
        @attr[attr] = value
    else
        raise DBI::NotSupportedError
    end

    return value
end

#__generate_attr__ ⇒ Object

This method is used to aid the constructor and probably should not be used independently.



152
153
154
155
156
157
158
159
160
161
162
163
 
# File 'lib/dbd/sqlite3/database.rb', line 152

def __generate_attr__()
    tt = @db.type_translation
    @db.type_translation = false
    [ 'auto_vacuum', 'cache_size', 'default_cache_size',
    'default_synchronous', 'default_temp_store', 'full_column_names',
    'synchronous', 'temp_store', 'type_translation' ].each do |key|
        unless @attr.has_key?(key) then
            @attr[key] = @db.__send__(key)
        end
    end
    @db.type_translation = tt
end

#columns(table) ⇒ Object

See DBI::BaseDatabase#columns.

Additional Attributes:

  • sql_type: XOPEN integer SQL Type.

  • nullable: true if NULL is allowed in this column.

  • default: the value that will be used in new rows if this column receives no data.



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
 
# File 'lib/dbd/sqlite3/database.rb', line 115

def columns(table)
    @db.type_translation = false
    ret =
        @db.table_info(table).map do |hash|
            m = DBI::DBD::SQLite3.parse_type(hash['type'])
            h = { 
                'name' => hash['name'],
                'type_name' => m[1],
                'sql_type' => 
                    begin
                        DBI.const_get('SQL_'+hash['type'].upcase)
                    rescue NameError
                        DBI::SQL_OTHER
                    end,
                'nullable' => (hash['notnull'] == '0'),
                'default' => (@attr['type_translation'] && (not hash['dflt_value'])) ? 
                                @db.translator.translate(hash['type'], hash['dflt_value']) :
                                hash['dflt_value'] 
            }

            h['precision'] = m[3].to_i if m[3]
            h['scale']     = m[5].to_i if m[5]

            h
        end
    @db.type_translation = @attr['type_translation']
    ret
end

#commit ⇒ Object 



62
63
64
65
66
67
68
69
 
# File 'lib/dbd/sqlite3/database.rb', line 62

def commit()
    if @db.transaction_active?
        @db.commit
        @db.transaction
    else
        raise DBI::ProgrammingError.new("No active transaction.")
    end
end

#database_name ⇒ Object 



49
50
51
52
53
54
55
56
 
# File 'lib/dbd/sqlite3/database.rb', line 49

def database_name
    st = DBI::DBD::SQLite3::Statement.new('PRAGMA database_list', @db)
    st.execute
    row = st.fetch
    st.finish

    return row[2]
end

#disconnect ⇒ Object 



40
41
42
43
 
# File 'lib/dbd/sqlite3/database.rb', line 40

def disconnect()
    @db.rollback if @db.transaction_active?
    @db.close
end

#ping ⇒ Object 



58
59
60
 
# File 'lib/dbd/sqlite3/database.rb', line 58

def ping()
    not @db.closed?
end

#prepare(statement) ⇒ Object 



45
46
47
 
# File 'lib/dbd/sqlite3/database.rb', line 45

def prepare(statement)
    DBI::DBD::SQLite3::Statement.new(statement, @db)
end

#quote(value) ⇒ Object 



144
145
146
 
# File 'lib/dbd/sqlite3/database.rb', line 144

def quote(value)
    ::SQLite3::Database.quote(value.to_s)
end

#rollback ⇒ Object

See DBI::BaseDatabase#rollback.

If all statements were not closed before the rollback occurs, a DBI::Warning may be raised if the database encounters an error because of it.

This method will also raise DBI::ProgrammingError if not in a transaction.



81
82
83
84
85
86
87
88
89
90
91
92
 
# File 'lib/dbd/sqlite3/database.rb', line 81

def rollback()
    if @db.transaction_active?
        begin 
            @db.rollback 
            @db.transaction
        rescue Exception => e
            raise DBI::Warning, "Statements were not closed prior to rollback"
        end
    else
        raise DBI::ProgrammingError.new("No active transaction.")
    end
end

#tables ⇒ Object 



94
95
96
97
98
99
100
101
102
103
 
# File 'lib/dbd/sqlite3/database.rb', line 94

def tables()
    ret = []
    result = @db.execute(%q(
        SELECT name FROM sqlite_master WHERE type IN ('table', 'view') 
        UNION ALL 
        SELECT name FROM sqlite_temp_master WHERE type in ('table', 'view') ORDER BY 1
    ))
    result.each{|row| ret.push(row[0])}
    ret
end