### Home Classes Methods

### In Files

- lib/sequel/adapters/jdbc/hsqldb.rb

### Parent

JDBC::Dataset

### Methods

- #complex_expression_sql_append
- #literal_blob_append
- #literal_false
- #literal_sqltime
- #literal_true
- #recursive_cte_requires_column_aliases?
- #select_clause_methods
- #select_from_sql
- #select_with_sql_base
- #supports_is_true?

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- cheat_sheet.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- opening_databases.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
- 3.4.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- schema_modification.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

### Class Index

Quicksearch

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- Sequel::PoolTimeout
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- Sequel::Qualifier
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- Sequel::SQL::AliasedExpression
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- Sequel::SQL::ColumnAll
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- Sequel::SQL::ComplexExpressionMethods
- Sequel::SQL::Constant
- Sequel::SQL::Constants
- Sequel::SQL::Expression
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- Sequel::Swift::MySQL::Dataset
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- Sequel::Swift::SQLite::Dataset
- Sequel::ThreadLocalTimezones
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- Sequel::TimestampMigrator
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- Sequel::ToDot
- Sequel::UnbindDuplicate
- Sequel::Unbinder
- Sequel::UndefinedAssociation
- Sequel::UnthreadedServerBlock
- Sequel::ValidationFailed
- Dataset
- Dataset::ArgumentMapper
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- Dataset::PreparedStatementMethods
- String
- String::Inflections
- Array
- FalseClass
- Hash
- NilClass
- Numeric
- Object
- PGconn
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- Proc
- Symbol
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No matching classes.

# Sequel::JDBC::HSQLDB::Dataset

Dataset class for HSQLDB datasets accessed via JDBC.

### Constants

BITWISE_METHOD_MAP
BOOL_TRUE
BOOL_FALSE
SELECT_CLAUSE_METHODS

  HSQLDB does support common table expressions, but the support is broken. CTEs operate more like temprorary tables or views, lasting longer than the duration of the expression. CTEs in earlier queries might take precedence over CTEs with the same name in later queries. Also, if any CTE is recursive, all CTEs must be recursive. If you want to use CTEs with HSQLDB, you’ll have to manually modify the dataset to allow it.

SQL_WITH_RECURSIVE
APOS
HSTAR
BLOB_OPEN
BITCOMP_OPEN
BITCOMP_CLOSE
DEFAULT_FROM
TIME_FORMAT

### Public Instance Methods

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

Handle HSQLDB specific case insensitive LIKE and bitwise operator support.

         # File lib/sequel/adapters/jdbc/hsqldb.rb, line 104
    104:         def complex_expression_sql_append(sql, op, args)
    105:           case op
    106:           when :ILIKE, :"NOT ILIKE"
    107:             super(sql, (op == :ILIKE ? :LIKE : :"NOT LIKE"), [SQL::Function.new(:ucase, args.at(0)), SQL::Function.new(:ucase, args.at(1)) ])
    108:           when :&, :|, :^
    109:             op = BITWISE_METHOD_MAP[op]
    110:             sql << complex_expression_arg_pairs(args){|a, b| literal(SQL::Function.new(op, a, b))}
    111:           when :<<
    112:             sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} * POWER(2, #{literal(b)}))"}
    113:           when :>>
    114:             sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} / POWER(2, #{literal(b)}))"}
    115:           when :'B~'
    116:             sql << BITCOMP_OPEN
    117:             literal_append(sql, args.at(0))
    118:             sql << BITCOMP_CLOSE
    119:           else
    120:             super
    121:           end
    122:         end

recursive_cte_requires_column_aliases?() click to toggle source

HSQLDB requires recursive CTEs to have column aliases.

         # File lib/sequel/adapters/jdbc/hsqldb.rb, line 125
    125:         def recursive_cte_requires_column_aliases?
    126:           true
    127:         end

supports_is_true?() click to toggle source

HSQLDB does not support IS TRUE.

         # File lib/sequel/adapters/jdbc/hsqldb.rb, line 130
    130:         def supports_is_true?
    131:           false
    132:         end

### Private Instance Methods

literal_blob_append(sql, v) click to toggle source

Use string in hex format for blob data.

         # File lib/sequel/adapters/jdbc/hsqldb.rb, line 137
    137:         def literal_blob_append(sql, v)
    138:           sql << BLOB_OPEN << v.unpack(HSTAR).first << APOS
    139:         end

literal_false() click to toggle source

HSQLDB uses FALSE for false values.

         # File lib/sequel/adapters/jdbc/hsqldb.rb, line 142
    142:         def literal_false
    143:           BOOL_FALSE
    144:         end

literal_sqltime(v) click to toggle source

HSQLDB handles fractional seconds in timestamps, but not in times

         # File lib/sequel/adapters/jdbc/hsqldb.rb, line 147
    147:         def literal_sqltime(v)
    148:           v.strftime(TIME_FORMAT)
    149:         end

literal_true() click to toggle source

HSQLDB uses TRUE for true values.

         # File lib/sequel/adapters/jdbc/hsqldb.rb, line 152
    152:         def literal_true
    153:           BOOL_TRUE
    154:         end

select_clause_methods() click to toggle source

HSQLDB does not support CTEs well enough for Sequel to enable support for them.

         # File lib/sequel/adapters/jdbc/hsqldb.rb, line 157
    157:         def select_clause_methods
    158:           SELECT_CLAUSE_METHODS
    159:         end

select_from_sql(sql) click to toggle source

Use a default FROM table if the dataset does not contain a FROM table.

         # File lib/sequel/adapters/jdbc/hsqldb.rb, line 162
    162:         def select_from_sql(sql)
    163:           if @opts[:from]
    164:             super
    165:           else
    166:             sql << DEFAULT_FROM
    167:           end
    168:         end

select_with_sql_base() click to toggle source

Use WITH RECURSIVE instead of WITH if any of the CTEs is recursive

         # File lib/sequel/adapters/jdbc/hsqldb.rb, line 171
    171:         def select_with_sql_base
    172:           opts[:with].any?{|w| w[:recursive]} ? SQL_WITH_RECURSIVE : super
    173:         end

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