| Module | Sequel::SQLite::DatabaseMethods |
| In: |
lib/sequel_core/adapters/shared/sqlite.rb
|
| AUTO_VACUUM | = | {'0' => :none, '1' => :full, '2' => :incremental}.freeze |
| SYNCHRONOUS | = | {'0' => :off, '1' => :normal, '2' => :full}.freeze |
| TABLES_FILTER | = | "type = 'table' AND NOT name = 'sqlite_sequence'" |
| TEMP_STORE | = | {'0' => :default, '1' => :file, '2' => :memory}.freeze |
| TYPES | = | Sequel::Schema::SQL::TYPES.merge(Bignum=>'integer') |
Run all alter_table commands in a transaction. This is technically only needed for drop column.
# File lib/sequel_core/adapters/shared/sqlite.rb, line 12
12: def alter_table(name, generator=nil, &block)
13: transaction{super}
14: end
SQLite supports limited table modification. You can add a column or an index. Dropping columns is supported by copying the table into a temporary table, dropping the table, and creating a new table without the column inside of a transaction.
# File lib/sequel_core/adapters/shared/sqlite.rb, line 20
20: def alter_table_sql(table, op)
21: case op[:op]
22: when :add_column, :add_index, :drop_index
23: super
24: when :drop_column
25: columns_str = (schema_parse_table(table, {}).map{|c| c[0]} - Array(op[:name])).join(",")
26: defined_columns_str = column_list_sql parse_pragma(table, {}).reject{ |c| c[:name] == op[:name].to_s}
27: ["CREATE TEMPORARY TABLE #{table}_backup(#{defined_columns_str})",
28: "INSERT INTO #{table}_backup SELECT #{columns_str} FROM #{table}",
29: "DROP TABLE #{table}",
30: "CREATE TABLE #{table}(#{defined_columns_str})",
31: "INSERT INTO #{table} SELECT #{columns_str} FROM #{table}_backup",
32: "DROP TABLE #{table}_backup"]
33: else
34: raise Error, "Unsupported ALTER TABLE operation"
35: end
36: end
A symbol signifying the value of the auto_vacuum PRAGMA.
# File lib/sequel_core/adapters/shared/sqlite.rb, line 39
39: def auto_vacuum
40: AUTO_VACUUM[pragma_get(:auto_vacuum).to_s]
41: end
Set the auto_vacuum PRAGMA using the given symbol (:none, :full, or :incremental).
# File lib/sequel_core/adapters/shared/sqlite.rb, line 45
45: def auto_vacuum=(value)
46: value = AUTO_VACUUM.key(value) || (raise Error, "Invalid value for auto_vacuum option. Please specify one of :none, :full, :incremental.")
47: pragma_set(:auto_vacuum, value)
48: end
Get the value of the given PRAGMA.
# File lib/sequel_core/adapters/shared/sqlite.rb, line 51
51: def pragma_get(name)
52: self["PRAGMA #{name}"].single_value
53: end
Set the value of the given PRAGMA to value.
# File lib/sequel_core/adapters/shared/sqlite.rb, line 56
56: def pragma_set(name, value)
57: execute_ddl("PRAGMA #{name} = #{value}")
58: end
A symbol signifying the value of the synchronous PRAGMA.
# File lib/sequel_core/adapters/shared/sqlite.rb, line 61
61: def synchronous
62: SYNCHRONOUS[pragma_get(:synchronous).to_s]
63: end
Set the synchronous PRAGMA using the given symbol (:off, :normal, or :full).
# File lib/sequel_core/adapters/shared/sqlite.rb, line 66
66: def synchronous=(value)
67: value = SYNCHRONOUS.key(value) || (raise Error, "Invalid value for synchronous option. Please specify one of :off, :normal, :full.")
68: pragma_set(:synchronous, value)
69: end
Array of symbols specifying the table names in the current database.
Options:
# File lib/sequel_core/adapters/shared/sqlite.rb, line 75
75: def tables(opts={})
76: ds = self[:sqlite_master].server(opts[:server]).filter(TABLES_FILTER)
77: ds.identifier_output_method = nil
78: ds.identifier_input_method = nil
79: ds2 = dataset
80: ds.map{|r| ds2.send(:output_identifier, r[:name])}
81: end
A symbol signifying the value of the temp_store PRAGMA.
# File lib/sequel_core/adapters/shared/sqlite.rb, line 84
84: def temp_store
85: TEMP_STORE[pragma_get(:temp_store).to_s]
86: end
Set the temp_store PRAGMA using the given symbol (:default, :file, or :memory).
# File lib/sequel_core/adapters/shared/sqlite.rb, line 89
89: def temp_store=(value)
90: value = TEMP_STORE.key(value) || (raise Error, "Invalid value for temp_store option. Please specify one of :default, :file, :memory.")
91: pragma_set(:temp_store, value)
92: end