Module: Sequel::SQLite::DatabaseMethods

### Home Classes Methods

### In Files

- lib/sequel/adapters/shared/sqlite.rb

### Methods

- #alter_table
- #auto_vacuum
- #auto_vacuum=
- #database_type
- #foreign_keys
- #foreign_keys=
- #indexes
- #pragma_get
- #pragma_set
- #sqlite_version
- #supports_savepoints?
- #synchronous
- #synchronous=
- #tables
- #temp_store
- #temp_store=

### Files

- CHANGELOG
- COPYING
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- querying.rdoc
- reflection.rdoc
- 1.0.txt
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- 3.4.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- sharding.rdoc
- sql.rdoc
- virtual_rows.rdoc

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No matching classes.

# Sequel::SQLite::DatabaseMethods

No matter how you connect to SQLite, the following Database options can be used to set PRAGMAs on connections in a thread-safe manner: :auto_vacuum, :foreign_keys, :synchronous, and :temp_store.

### Constants

AUTO_VACUUM
PRIMARY_KEY_INDEX_RE
SYNCHRONOUS
TABLES_FILTER
TEMP_STORE

### Public Instance Methods

alter_table(name, generator=nil, &block) click to toggle source

Run all alter_table commands in a transaction. This is technically only needed for drop column.

    # File lib/sequel/adapters/shared/sqlite.rb, line 15
    def alter_table(name, generator=nil, &block)
      remove_cached_schema(name)
      generator ||= Schema::AlterTableGenerator.new(self, &block)
      transaction{generator.operations.each{|op| alter_table_sql_list(name, [op]).flatten.each{|sql| execute_ddl(sql)}}}
    end

auto_vacuum() click to toggle source

A symbol signifying the value of the auto_vacuum PRAGMA.

    # File lib/sequel/adapters/shared/sqlite.rb, line 22
    def auto_vacuum
      AUTO_VACUUM[pragma_get(:auto_vacuum).to_i]
    end

auto_vacuum=(value) click to toggle source

Set the auto_vacuum PRAGMA using the given symbol (:none, :full, or :incremental). See pragma_set. Consider using the :auto_vacuum Database option instead.

    # File lib/sequel/adapters/shared/sqlite.rb, line 29
    def auto_vacuum=(value)
      value = AUTO_VACUUM.index(value) || (raise Error, "Invalid value for auto_vacuum option. Please specify one of :none, :full, :incremental.")
      pragma_set(:auto_vacuum, value)
    end

database_type() click to toggle source

SQLite uses the :sqlite database type.

    # File lib/sequel/adapters/shared/sqlite.rb, line 35
    def database_type
      :sqlite
    end

foreign_keys() click to toggle source

Boolean signifying the value of the foreign_keys PRAGMA, or nil if not using SQLite 3.6.19+.

    # File lib/sequel/adapters/shared/sqlite.rb, line 41
    def foreign_keys
      pragma_get(:foreign_keys).to_i == 1 if sqlite_version >= 30619
    end

foreign_keys=(value) click to toggle source

Set the foreign_keys PRAGMA using the given boolean value, if using SQLite 3.6.19+. If not using 3.6.19+, no error is raised. See pragma_set. Consider using the :foreign_keys Database option instead.

    # File lib/sequel/adapters/shared/sqlite.rb, line 48
    def foreign_keys=(value)
      pragma_set(:foreign_keys, !!value ? 'on' : 'off') if sqlite_version >= 30619
    end

indexes(table, opts={}) click to toggle source

Use the index_list and index_info PRAGMAs to determine the indexes on the table.

    # File lib/sequel/adapters/shared/sqlite.rb, line 53
    def indexes(table, opts={})
      m = output_identifier_meth
      im = input_identifier_meth
      indexes = {}
      begin
        metadata_dataset.with_sql("PRAGMA index_list(?)", im.call(table)).each do |r|
          next if r[:name] =~ PRIMARY_KEY_INDEX_RE
          indexes[m.call(r[:name])] = {:unique=>r[:unique].to_i==1}
        end
      rescue Sequel::DatabaseError
        nil
      else
        indexes.each do |k, v|
          v[:columns] = metadata_dataset.with_sql("PRAGMA index_info(?)", im.call(k)).map(:name).map{|x| m.call(x)}
        end
      end
      indexes
    end

pragma_get(name) click to toggle source

Get the value of the given PRAGMA.

    # File lib/sequel/adapters/shared/sqlite.rb, line 73
    def pragma_get(name)
      self["PRAGMA #{name}"].single_value
    end

pragma_set(name, value) click to toggle source

Set the value of the given PRAGMA to value.

This method is not thread safe, and will not work correctly if there are multiple connections in the Database’s connection pool. PRAGMA modifications should be done when the connection is created, using an option provided when creating the Database object.

    # File lib/sequel/adapters/shared/sqlite.rb, line 83
    def pragma_set(name, value)
      execute_ddl("PRAGMA #{name} = #{value}")
    end

sqlite_version() click to toggle source

The version of the server as an integer, where 3.6.19 = 30619. If the server version can’t be determined, 0 is used.

    # File lib/sequel/adapters/shared/sqlite.rb, line 89
    def sqlite_version
      return @sqlite_version if defined?(@sqlite_version)
      @sqlite_version = begin
        v = get{sqlite_version{}}
        [10000, 100, 1].zip(v.split('.')).inject(0){|a, m| a + m[0] * Integer(m[1])}
      rescue
        0
      end
    end

supports_savepoints?() click to toggle source

SQLite 3.6.8+ supports savepoints.

    # File lib/sequel/adapters/shared/sqlite.rb, line 100
    def supports_savepoints?
      sqlite_version >= 30608
    end

synchronous() click to toggle source

A symbol signifying the value of the synchronous PRAGMA.

    # File lib/sequel/adapters/shared/sqlite.rb, line 105
    def synchronous
      SYNCHRONOUS[pragma_get(:synchronous).to_i]
    end

synchronous=(value) click to toggle source

Set the synchronous PRAGMA using the given symbol (:off, :normal, or :full). See pragma_set. Consider using the :synchronous Database option instead.

    # File lib/sequel/adapters/shared/sqlite.rb, line 111
    def synchronous=(value)
      value = SYNCHRONOUS.index(value) || (raise Error, "Invalid value for synchronous option. Please specify one of :off, :normal, :full.")
      pragma_set(:synchronous, value)
    end

tables(opts={}) click to toggle source

Array of symbols specifying the table names in the current database.

Options:

- :server - Set the server to use.

    # File lib/sequel/adapters/shared/sqlite.rb, line 120
    def tables(opts={})
      m = output_identifier_meth
      metadata_dataset.from(:sqlite_master).server(opts[:server]).filter(TABLES_FILTER).map{|r| m.call(r[:name])}
    end

temp_store() click to toggle source

A symbol signifying the value of the temp_store PRAGMA.

    # File lib/sequel/adapters/shared/sqlite.rb, line 126
    def temp_store
      TEMP_STORE[pragma_get(:temp_store).to_i]
    end

temp_store=(value) click to toggle source

Set the temp_store PRAGMA using the given symbol (:default, :file, or :memory). See pragma_set. Consider using the :temp_store Database option instead.

    # File lib/sequel/adapters/shared/sqlite.rb, line 132
    def temp_store=(value)
      value = TEMP_STORE.index(value) || (raise Error, "Invalid value for temp_store option. Please specify one of :default, :file, :memory.")
      pragma_set(:temp_store, value)
    end

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