Module: Sequel::MySQL::DatasetMethods

### Home Classes Methods

### In Files

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

### Methods

- #calc_found_rows
- #complex_expression_sql_append
- #distinct
- #explain
- #for_share
- #full_text_search
- #full_text_sql
- #insert_ignore
- #join_table
- #join_type_sql
- #multi_insert_sql
- #on_duplicate_key_update
- #quoted_identifier_append
- #supports_distinct_on?
- #supports_group_rollup?
- #supports_intersect_except?
- #supports_modifying_joins?
- #supports_ordered_distinct_on?
- #supports_regexp?
- #supports_timestamp_usecs?
- #update_ignore

### Included Modules

- Sequel::Dataset::Replace

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- bin_sequel.rdoc
- cheat_sheet.rdoc
- code_order.rdoc
- core_extensions.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- extensions.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- model_plugins.rdoc
- object_model.rdoc
- opening_databases.rdoc
- postgresql.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.13.0.txt
- 3.14.0.txt
- 3.15.0.txt
- 3.16.0.txt
- 3.17.0.txt
- 3.18.0.txt
- 3.19.0.txt
- 3.2.0.txt
- 3.20.0.txt
- 3.21.0.txt
- 3.22.0.txt
- 3.23.0.txt
- 3.24.0.txt
- 3.25.0.txt
- 3.26.0.txt
- 3.27.0.txt
- 3.28.0.txt
- 3.29.0.txt
- 3.3.0.txt
- 3.30.0.txt
- 3.31.0.txt
- 3.32.0.txt
- 3.33.0.txt
- 3.34.0.txt
- 3.35.0.txt
- 3.36.0.txt
- 3.37.0.txt
- 3.38.0.txt
- 3.39.0.txt
- 3.4.0.txt
- 3.40.0.txt
- 3.41.0.txt
- 3.42.0.txt
- 3.43.0.txt
- 3.44.0.txt
- 3.45.0.txt
- 3.46.0.txt
- 3.47.0.txt
- 3.48.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- 4.0.0.txt
- 4.1.0.txt
- 4.2.0.txt
- 4.3.0.txt
- 4.4.0.txt
- 4.5.0.txt
- schema_modification.rdoc
- security.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- thread_safety.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

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- Sequel::MySQL::PreparedStatements::DatasetMethods::StoredProcedureMethods
- Sequel::Mysql2
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- Sequel::NamedTimezones
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- Sequel::NoExistingObject
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- Sequel::NotNullConstraintViolation
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- Sequel::Plugins::AssociationPks::ClassMethods
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- Sequel::Plugins::AssociationProxies::AssociationProxy
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- Sequel::Plugins::AutoValidations
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- Sequel::Plugins::BlacklistSecurity::ClassMethods
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- Sequel::Plugins::BlacklistSecurity::InstanceMethods::ExceptionList
- Sequel::Plugins::BooleanReaders
- Sequel::Plugins::BooleanReaders::ClassMethods
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- Sequel::Plugins::Caching::ClassMethods
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- Sequel::Plugins::ClassTableInheritance
- Sequel::Plugins::ClassTableInheritance::ClassMethods
- Sequel::Plugins::ClassTableInheritance::InstanceMethods
- Sequel::Plugins::Composition
- Sequel::Plugins::Composition::ClassMethods
- Sequel::Plugins::Composition::InstanceMethods
- Sequel::Plugins::ConstraintValidations
- Sequel::Plugins::ConstraintValidations::ClassMethods
- Sequel::Plugins::ConstraintValidations::DatabaseMethods
- Sequel::Plugins::ConstraintValidations::InstanceMethods
- Sequel::Plugins::DatasetAssociations
- Sequel::Plugins::DatasetAssociations::ClassMethods
- Sequel::Plugins::DatasetAssociations::DatasetMethods
- Sequel::Plugins::DefaultsSetter
- Sequel::Plugins::DefaultsSetter::ClassMethods
- Sequel::Plugins::DefaultsSetter::InstanceMethods
- Sequel::Plugins::Dirty
- Sequel::Plugins::Dirty::InstanceMethods
- Sequel::Plugins::EagerEach
- Sequel::Plugins::EagerEach::DatasetMethods
- Sequel::Plugins::ErrorSplitter
- Sequel::Plugins::ErrorSplitter::InstanceMethods
- Sequel::Plugins::ForceEncoding
- Sequel::Plugins::ForceEncoding::ClassMethods
- Sequel::Plugins::ForceEncoding::InstanceMethods
- Sequel::Plugins::HookClassMethods
- Sequel::Plugins::HookClassMethods::ClassMethods
- Sequel::Plugins::HookClassMethods::InstanceMethods
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- Sequel::Plugins::InputTransformer::InstanceMethods
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- Sequel::Plugins::InstanceHooks
- Sequel::Plugins::InstanceHooks::InstanceMethods
- Sequel::Plugins::JsonSerializer
- Sequel::Plugins::JsonSerializer::ClassMethods
- Sequel::Plugins::JsonSerializer::DatasetMethods
- Sequel::Plugins::JsonSerializer::InstanceMethods
- Sequel::Plugins::JsonSerializer::Literal
- Sequel::Plugins::LazyAttributes
- Sequel::Plugins::LazyAttributes::ClassMethods
- Sequel::Plugins::LazyAttributes::InstanceMethods
- Sequel::Plugins::List
- Sequel::Plugins::List::ClassMethods
- Sequel::Plugins::List::InstanceMethods
- Sequel::Plugins::ManyThroughMany
- Sequel::Plugins::ManyThroughMany::ClassMethods
- Sequel::Plugins::ManyThroughMany::DatasetMethods
- Sequel::Plugins::ManyThroughMany::ManyThroughManyAssociationReflection
- Sequel::Plugins::ManyToOnePkLookup
- Sequel::Plugins::MssqlOptimisticLocking
- Sequel::Plugins::MssqlOptimisticLocking::ClassMethods
- Sequel::Plugins::MssqlOptimisticLocking::InstanceMethods
- Sequel::Plugins::NestedAttributes
- Sequel::Plugins::NestedAttributes::ClassMethods
- Sequel::Plugins::NestedAttributes::InstanceMethods
- Sequel::Plugins::OptimisticLocking
- Sequel::Plugins::OptimisticLocking::ClassMethods
- Sequel::Plugins::OptimisticLocking::Error
- Sequel::Plugins::OptimisticLocking::InstanceMethods
- Sequel::Plugins::PgArrayAssociations
- Sequel::Plugins::PgArrayAssociations::ClassMethods
- Sequel::Plugins::PgArrayAssociations::DatasetMethods
- Sequel::Plugins::PgArrayAssociations::ManyToPgArrayAssociationReflection
- Sequel::Plugins::PgArrayAssociations::PgArrayToManyAssociationReflection
- Sequel::Plugins::PgRow
- Sequel::Plugins::PgRow::ClassMethods
- Sequel::Plugins::PgRow::DatabaseMethods
- Sequel::Plugins::PgRow::InstanceMethods
- Sequel::Plugins::PgTypecastOnLoad
- Sequel::Plugins::PgTypecastOnLoad::ClassMethods
- Sequel::Plugins::PgTypecastOnLoad::InstanceMethods
- Sequel::Plugins::PreparedStatements
- Sequel::Plugins::PreparedStatements::ClassMethods
- Sequel::Plugins::PreparedStatements::InstanceMethods
- Sequel::Plugins::PreparedStatementsAssociations
- Sequel::Plugins::PreparedStatementsAssociations::ClassMethods
- Sequel::Plugins::PreparedStatementsAssociations::InstanceMethods
- Sequel::Plugins::PreparedStatementsSafe
- Sequel::Plugins::PreparedStatementsSafe::ClassMethods
- Sequel::Plugins::PreparedStatementsSafe::InstanceMethods
- Sequel::Plugins::PreparedStatementsWithPk
- Sequel::Plugins::PreparedStatementsWithPk::ClassMethods
- Sequel::Plugins::PreparedStatementsWithPk::DatasetMethods
- Sequel::Plugins::RcteTree
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- Sequel::Plugins::Scissors
- Sequel::Plugins::Scissors::ClassMethods
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- Sequel::Plugins::SerializationModificationDetection
- Sequel::Plugins::SerializationModificationDetection::InstanceMethods
- Sequel::Plugins::Sharding
- Sequel::Plugins::Sharding::ClassMethods
- Sequel::Plugins::Sharding::DatasetMethods
- Sequel::Plugins::Sharding::InstanceMethods
- Sequel::Plugins::SingleTableInheritance
- Sequel::Plugins::SingleTableInheritance::ClassMethods
- Sequel::Plugins::SingleTableInheritance::InstanceMethods
- Sequel::Plugins::SkipCreateRefresh
- Sequel::Plugins::SkipCreateRefresh::InstanceMethods
- Sequel::Plugins::StaticCache
- Sequel::Plugins::StaticCache::ClassMethods
- Sequel::Plugins::StaticCache::InstanceMethods
- Sequel::Plugins::StringStripper
- Sequel::Plugins::StringStripper::ClassMethods
- Sequel::Plugins::Subclasses
- Sequel::Plugins::Subclasses::ClassMethods
- Sequel::Plugins::TableSelect
- Sequel::Plugins::TableSelect::ClassMethods
- Sequel::Plugins::TacticalEagerLoading
- Sequel::Plugins::TacticalEagerLoading::DatasetMethods
- Sequel::Plugins::TacticalEagerLoading::InstanceMethods
- Sequel::Plugins::Timestamps
- Sequel::Plugins::Timestamps::ClassMethods
- Sequel::Plugins::Timestamps::InstanceMethods
- Sequel::Plugins::Touch
- Sequel::Plugins::Touch::ClassMethods
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- Sequel::Plugins::UpdatePrimaryKey::InstanceMethods
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- Sequel::Plugins::ValidationClassMethods::ClassMethods
- Sequel::Plugins::ValidationClassMethods::ClassMethods::Generator
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- Sequel::Plugins::XmlSerializer
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- Sequel::Plugins::XmlSerializer::DatasetMethods
- Sequel::Plugins::XmlSerializer::InstanceMethods
- Sequel::PoolTimeout
- Sequel::Postgres
- Sequel::Postgres::Adapter
- Sequel::Postgres::AlterTableGenerator
- Sequel::Postgres::ArrayOp
- Sequel::Postgres::ArrayOpMethods
- Sequel::Postgres::CreateTableGenerator
- Sequel::Postgres::Database
- Sequel::Postgres::DatabaseMethods
- Sequel::Postgres::Dataset
- Sequel::Postgres::Dataset::ArgumentMapper
- Sequel::Postgres::Dataset::BindArgumentMethods
- Sequel::Postgres::Dataset::PreparedStatementMethods
- Sequel::Postgres::DatasetMethods
- Sequel::Postgres::DatasetMethods::PreparedStatementMethods
- Sequel::Postgres::ExclusionConstraintViolation
- Sequel::Postgres::HStore
- Sequel::Postgres::HStore::DatabaseMethods
- Sequel::Postgres::HStore::Parser
- Sequel::Postgres::HStoreOp
- Sequel::Postgres::HStoreOpMethods
- Sequel::Postgres::InetDatabaseMethods
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- Sequel::Postgres::IntervalDatabaseMethods
- Sequel::Postgres::IntervalDatabaseMethods::Parser
- Sequel::Postgres::IntervalDatasetMethods
- Sequel::Postgres::JSONArray
- Sequel::Postgres::JSONDatabaseMethods
- Sequel::Postgres::JSONHash
- Sequel::Postgres::JSONOp
- Sequel::Postgres::JSONOpMethods
- Sequel::Postgres::LooseCount
- Sequel::Postgres::PGArray
- Sequel::Postgres::PGArray::Creator
- Sequel::Postgres::PGArray::DatabaseMethods
- Sequel::Postgres::PGArray::JSONCreator
- Sequel::Postgres::PGArray::Parser
- Sequel::Postgres::PGRange
- Sequel::Postgres::PGRange::DatabaseMethods
- Sequel::Postgres::PGRange::DatasetMethods
- Sequel::Postgres::PGRange::Parser
- Sequel::Postgres::PGRow
- Sequel::Postgres::PGRow::ArrayRow
- Sequel::Postgres::PGRow::DatabaseMethods
- Sequel::Postgres::PGRow::HashRow
- Sequel::Postgres::PGRow::Parser
- Sequel::Postgres::PGRow::Splitter
- Sequel::Postgres::PGRowOp
- Sequel::Postgres::PGRowOp::ExpressionMethods
- Sequel::Postgres::RangeOp
- Sequel::Postgres::RangeOpMethods
- Sequel::Postgres::StaticCacheUpdater
- Sequel::PrettyTable
- Sequel::Progress
- Sequel::Progress::DatabaseMethods
- Sequel::Progress::DatasetMethods
- Sequel::Qualifier
- Sequel::QueryLiterals
- Sequel::Rollback
- Sequel::SQL
- Sequel::SQL::AliasMethods
- Sequel::SQL::AliasedExpression
- Sequel::SQL::BitwiseMethods
- Sequel::SQL::Blob
- Sequel::SQL::BooleanConstant
- Sequel::SQL::BooleanExpression
- Sequel::SQL::BooleanMethods
- Sequel::SQL::Builders
- Sequel::SQL::CaseExpression
- Sequel::SQL::Cast
- Sequel::SQL::CastMethods
- Sequel::SQL::ColumnAll
- Sequel::SQL::ComplexExpression
- Sequel::SQL::ComplexExpressionMethods
- Sequel::SQL::Constant
- Sequel::SQL::Constants
- Sequel::SQL::DateAdd
- Sequel::SQL::DateAdd::DatasetMethods
- Sequel::SQL::DelayedEvaluation
- Sequel::SQL::EmulatedFunction
- Sequel::SQL::Expression
- Sequel::SQL::Function
- Sequel::SQL::GenericExpression
- Sequel::SQL::Identifier
- Sequel::SQL::InequalityMethods
- Sequel::SQL::JoinClause
- Sequel::SQL::JoinOnClause
- Sequel::SQL::JoinUsingClause
- Sequel::SQL::NegativeBooleanConstant
- Sequel::SQL::NumericExpression
- Sequel::SQL::NumericMethods
- Sequel::SQL::OperatorBuilders
- Sequel::SQL::OrderMethods
- Sequel::SQL::OrderedExpression
- Sequel::SQL::PlaceholderLiteralString
- Sequel::SQL::QualifiedIdentifier
- Sequel::SQL::QualifyingMethods
- Sequel::SQL::StringConcatenationMethods
- Sequel::SQL::StringExpression
- Sequel::SQL::StringMethods
- Sequel::SQL::Subscript
- Sequel::SQL::SubscriptMethods
- Sequel::SQL::ValueList
- Sequel::SQL::VirtualRow
- Sequel::SQL::Window
- Sequel::SQL::WindowFunction
- Sequel::SQL::Wrapper
- Sequel::SQLTime
- Sequel::SQLite
- Sequel::SQLite::Database
- Sequel::SQLite::DatabaseMethods
- Sequel::SQLite::Dataset
- Sequel::SQLite::Dataset::ArgumentMapper
- Sequel::SQLite::Dataset::BindArgumentMethods
- Sequel::SQLite::Dataset::PreparedStatementMethods
- Sequel::SQLite::DatasetMethods
- Sequel::Schema
- Sequel::Schema::AlterTableGenerator
- Sequel::Schema::CreateTableGenerator
- Sequel::Schema::Generator
- Sequel::SchemaCaching
- Sequel::SchemaDumper
- Sequel::SelectRemove
- Sequel::Sequel3DatasetMethods
- Sequel::SerializationFailure
- Sequel::ServerBlock
- Sequel::SetOverrides
- Sequel::ShardedSingleConnectionPool
- Sequel::ShardedThreadedConnectionPool
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# Sequel::MySQL::DatasetMethods

Dataset methods shared by datasets that use MySQL databases.

### Constants

APOS
APOS_RE
BACKSLASH
BACKSLASH_RE
BACKTICK
BACKTICK_RE
BINARY
BLOB_START
BOOL_FALSE
BOOL_TRUE
CAST_BITCOMP_CLOSE
CAST_BITCOMP_OPEN
COMMA
COMMA_SEPARATOR
CONCAT
DELETE_CLAUSE_METHODS
DOUBLE_APOS
DOUBLE_BACKTICK
EMPTY_BLOB
EMPTY_COLUMNS
EMPTY_VALUES
EQ
EQ_VALUES
ESCAPE
EXPLAIN
EXPLAIN_EXTENDED
FOR_SHARE
FROM
GROUP_BY
HSTAR
IGNORE
INSERT_CLAUSE_METHODS
LIKE
LIMIT
MATCH_AGAINST
MATCH_AGAINST_BOOLEAN
NATURAL_LEFT_JOIN
NOT_SPACE
ON_DUPLICATE_KEY_UPDATE
PAREN_CLOSE
PAREN_OPEN
QUAD_BACKSLASH
REGEXP
SELECT_CLAUSE_METHODS
SPACE
SQL_CALC_FOUND_ROWS
STRAIGHT_JOIN
UPDATE_CLAUSE_METHODS
WITH_ROLLUP

### Public Instance Methods

calc_found_rows() click to toggle source

Sets up the select methods to use SQL_CALC_FOUND_ROWS option.

    dataset.calc_found_rows.limit(10)
    # SELECT SQL_CALC_FOUND_ROWS * FROM table LIMIT 10

    # File lib/sequel/adapters/shared/mysql.rb, line 622
    def calc_found_rows
      clone(:calc_found_rows => true)
    end

complex_expression_sql_append(sql, op, args) click to toggle source

MySQL specific syntax for LIKE/REGEXP searches, as well as string concatenation.

    # File lib/sequel/adapters/shared/mysql.rb, line 574
    def complex_expression_sql_append(sql, op, args)
      case op
      when :IN, :"NOT IN"
        ds = args.at(1)
        if ds.is_a?(Sequel::Dataset) && ds.opts[:limit]
          super(sql, op, [args.at(0), ds.from_self])
        else
          super
        end
      when :~, :'!~', :'~*', :'!~*', :LIKE, :'NOT LIKE', :ILIKE, :'NOT ILIKE'
        sql << PAREN_OPEN
        literal_append(sql, args.at(0))
        sql << SPACE
        sql << 'NOT ' if [:'NOT LIKE', :'NOT ILIKE', :'!~', :'!~*'].include?(op)
        sql << ([:~, :'!~', :'~*', :'!~*'].include?(op) ? REGEXP : LIKE)
        sql << SPACE
        sql << BINARY if [:~, :'!~', :LIKE, :'NOT LIKE'].include?(op)
        literal_append(sql, args.at(1))
        if [:LIKE, :'NOT LIKE', :ILIKE, :'NOT ILIKE'].include?(op)
          sql << ESCAPE
          literal_append(sql, BACKSLASH)
        end
        sql << PAREN_CLOSE
      when :'||'
        if args.length > 1
          sql << CONCAT
          array_sql_append(sql, args)
        else
          literal_append(sql, args.at(0))
        end
      when :'B~'
        sql << CAST_BITCOMP_OPEN
        literal_append(sql, args.at(0))
        sql << CAST_BITCOMP_CLOSE
      else
        super
      end
    end

distinct(*args) click to toggle source

Use GROUP BY instead of DISTINCT ON if arguments are provided.

    # File lib/sequel/adapters/shared/mysql.rb, line 614
    def distinct(*args)
      args.empty? ? super : group(*args)
    end

explain(opts=OPTS) click to toggle source

Return the results of an EXPLAIN query as a string. Options:

:extended | Use EXPLAIN EXPTENDED instead of EXPLAIN if true.

    # File lib/sequel/adapters/shared/mysql.rb, line 628
    def explain(opts=OPTS)
      # Load the PrettyTable class, needed for explain output
      Sequel.extension(:_pretty_table) unless defined?(Sequel::PrettyTable)

      ds = db.send(:metadata_dataset).with_sql((opts[:extended] ? EXPLAIN_EXTENDED : EXPLAIN) + select_sql).naked
      rows = ds.all
      Sequel::PrettyTable.string(rows, ds.columns)
    end

for_share() click to toggle source

Return a cloned dataset which will use LOCK IN SHARE MODE to lock returned rows.

    # File lib/sequel/adapters/shared/mysql.rb, line 638
    def for_share
      lock_style(:share)
    end

full_text_search(cols, terms, opts = OPTS) click to toggle source

Adds full text filter

    # File lib/sequel/adapters/shared/mysql.rb, line 643
    def full_text_search(cols, terms, opts = OPTS)
      filter(full_text_sql(cols, terms, opts))
    end

full_text_sql(cols, terms, opts = OPTS) click to toggle source

MySQL specific full text search syntax.

    # File lib/sequel/adapters/shared/mysql.rb, line 648
    def full_text_sql(cols, terms, opts = OPTS)
      terms = terms.join(' ') if terms.is_a?(Array)
      SQL::PlaceholderLiteralString.new((opts[:boolean] ? MATCH_AGAINST_BOOLEAN : MATCH_AGAINST), [Array(cols), terms])
    end

insert_ignore() click to toggle source

Sets up the insert methods to use INSERT IGNORE. Useful if you have a unique key and want to just skip inserting rows that violate the unique key restriction.

    dataset.insert_ignore.multi_insert(
     [{:name => 'a', :value => 1}, {:name => 'b', :value => 2}]
    )
    # INSERT IGNORE INTO tablename (name, value) VALUES (a, 1), (b, 2)

    # File lib/sequel/adapters/shared/mysql.rb, line 682
    def insert_ignore
      clone(:insert_ignore=>true)
    end

join_table(type, table, expr=nil, opts=OPTS, &block) click to toggle source

Transforms an CROSS JOIN to an INNER JOIN if the expr is not nil. Raises an error on use of :full_outer type, since MySQL doesn't support it.

    # File lib/sequel/adapters/shared/mysql.rb, line 655
    def join_table(type, table, expr=nil, opts=OPTS, &block)
      type = :inner if (type == :cross) && !expr.nil?
      raise(Sequel::Error, "MySQL doesn't support FULL OUTER JOIN") if type == :full_outer
      super(type, table, expr, opts, &block)
    end

join_type_sql(join_type) click to toggle source

Transforms :natural_inner to NATURAL LEFT JOIN and straight to STRAIGHT_JOIN.

    # File lib/sequel/adapters/shared/mysql.rb, line 663
    def join_type_sql(join_type)
      case join_type
      when :straight
        STRAIGHT_JOIN
      when :natural_inner
        NATURAL_LEFT_JOIN
      else
        super
      end
    end

multi_insert_sql(columns, values) click to toggle source

MySQL specific syntax for inserting multiple values at once.

    # File lib/sequel/adapters/shared/mysql.rb, line 710
    def multi_insert_sql(columns, values)
      sql = LiteralString.new('VALUES ')
      expression_list_append(sql, values.map{|r| Array(r)})
      [insert_sql(columns, sql)]
    end

on_duplicate_key_update(*args) click to toggle source

Sets up the insert methods to use ON DUPLICATE KEY UPDATE If you pass no arguments, ALL fields will be updated with the new values. If you pass the fields you want then ONLY those field will be updated.

Useful if you have a unique key and want to update inserting rows that violate the unique key restriction.

    dataset.on_duplicate_key_update.multi_insert(
     [{:name => 'a', :value => 1}, {:name => 'b', :value => 2}]
    )
    # INSERT INTO tablename (name, value) VALUES (a, 1), (b, 2)
    # ON DUPLICATE KEY UPDATE name=VALUES(name), value=VALUES(value)

    dataset.on_duplicate_key_update(:value).multi_insert(
      [{:name => 'a', :value => 1}, {:name => 'b', :value => 2}]
    )
    # INSERT INTO tablename (name, value) VALUES (a, 1), (b, 2)
    # ON DUPLICATE KEY UPDATE value=VALUES(value)

    # File lib/sequel/adapters/shared/mysql.rb, line 705
    def on_duplicate_key_update(*args)
      clone(:on_duplicate_key_update => args)
    end

quoted_identifier_append(sql, c) click to toggle source

MySQL uses the nonstandard ` (backtick) for quoting identifiers.

    # File lib/sequel/adapters/shared/mysql.rb, line 717
    def quoted_identifier_append(sql, c)
      sql << BACKTICK << c.to_s.gsub(BACKTICK_RE, DOUBLE_BACKTICK) << BACKTICK
    end

supports_distinct_on?() click to toggle source

MySQL can emulate DISTINCT ON with its non-standard GROUP BY implementation, though the rows returned cannot be made deterministic through ordering.

    # File lib/sequel/adapters/shared/mysql.rb, line 723
    def supports_distinct_on?
      true
    end

supports_group_rollup?() click to toggle source

MySQL supports GROUP BY WITH ROLLUP (but not CUBE)

    # File lib/sequel/adapters/shared/mysql.rb, line 728
    def supports_group_rollup?
      true
    end

supports_intersect_except?() click to toggle source

MySQL does not support INTERSECT or EXCEPT

    # File lib/sequel/adapters/shared/mysql.rb, line 733
    def supports_intersect_except?
      false
    end

supports_modifying_joins?() click to toggle source

MySQL supports modifying joined datasets

    # File lib/sequel/adapters/shared/mysql.rb, line 738
    def supports_modifying_joins?
      true
    end

supports_ordered_distinct_on?() click to toggle source

MySQL's DISTINCT ON emulation using GROUP BY does not respect the queries ORDER BY clause.

    # File lib/sequel/adapters/shared/mysql.rb, line 744
    def supports_ordered_distinct_on?
      false
    end

supports_regexp?() click to toggle source

MySQL supports pattern matching via regular expressions

    # File lib/sequel/adapters/shared/mysql.rb, line 749
    def supports_regexp?
      true
    end

supports_timestamp_usecs?() click to toggle source

MySQL does support fractional timestamps in literal timestamps, but it ignores them. Also, using them seems to cause problems on 1.9. Since they are ignored anyway, not using them is probably best.

    # File lib/sequel/adapters/shared/mysql.rb, line 756
    def supports_timestamp_usecs?
      false
    end

update_ignore() click to toggle source

Sets up the update methods to use UPDATE IGNORE. Useful if you have a unique key and want to just skip updating rows that violate the unique key restriction.

    dataset.update_ignore.update({:name => 'a', :value => 1})
    # UPDATE IGNORE tablename SET name = 'a', value = 1

    # File lib/sequel/adapters/shared/mysql.rb, line 766
    def update_ignore
      clone(:update_ignore=>true)
    end

[Validate]

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