### Home Classes Methods

### In Files

- lib/sequel/plugins/prepared_statements.rb

### Methods

- #inherited
- #prepare_statement
- #prepared_columns
- #prepared_delete
- #prepared_insert
- #prepared_insert_select
- #prepared_lookup
- #prepared_refresh
- #prepared_statement_key_array
- #prepared_statement_key_hash
- #prepared_update
- #primary_key_lookup

### 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

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# Sequel::Plugins::PreparedStatements::ClassMethods

### Public Instance Methods

inherited(subclass) click to toggle source

Setup the datastructure used to hold the prepared statements in the subclass.

        # File lib/sequel/plugins/prepared_statements.rb, line 39
    39:         def inherited(subclass)
    40:           super
    41:           subclass.instance_variable_set(:@prepared_statements, :insert=>{}, :insert_select=>{}, :update=>{}, :lookup_sql=>{})
    42:         end

### Private Instance Methods

prepare_statement(ds, type, vals={}) click to toggle source

Create a prepared statement based on the given dataset with a unique name for the given type of query and values.

        # File lib/sequel/plugins/prepared_statements.rb, line 48
    48:         def prepare_statement(ds, type, vals={})
    49:           ds.prepare(type, :"smpsp_#{NEXT.call}", vals)
    50:         end

prepared_columns(cols) click to toggle source

Return a sorted array of columns for use as a hash key.

        # File lib/sequel/plugins/prepared_statements.rb, line 53
    53:         def prepared_columns(cols)
    54:           RUBY_VERSION >= '1.9' ? cols.sort : cols.sort_by{|c| c.to_s}
    55:         end

prepared_delete() click to toggle source

Return a prepared statement that can be used to delete a row from this model’s dataset.

        # File lib/sequel/plugins/prepared_statements.rb, line 58
    58:         def prepared_delete
    59:           @prepared_statements[:delete] ||= prepare_statement(filter(prepared_statement_key_array(primary_key)), :delete)
    60:         end

prepared_insert(cols) click to toggle source

Return a prepared statement that can be used to insert a row using the given columns.

        # File lib/sequel/plugins/prepared_statements.rb, line 63
    63:         def prepared_insert(cols)
    64:           @prepared_statements[:insert][prepared_columns(cols)] ||= prepare_statement(dataset, :insert, prepared_statement_key_hash(cols))
    65:         end

prepared_insert_select(cols) click to toggle source

Return a prepared statement that can be used to insert a row using the given columns and return that column values for the row created.

        # File lib/sequel/plugins/prepared_statements.rb, line 69
    69:         def prepared_insert_select(cols)
    70:           if dataset.supports_insert_select?
    71:             @prepared_statements[:insert_select][prepared_columns(cols)] ||= prepare_statement(naked.clone(:server=>dataset.opts.fetch(:server, :default)), :insert_select, prepared_statement_key_hash(cols))
    72:           end
    73:         end

prepared_lookup() click to toggle source

Return a prepared statement that can be used to lookup a row solely based on the primary key.

        # File lib/sequel/plugins/prepared_statements.rb, line 76
    76:         def prepared_lookup
    77:           @prepared_statements[:lookup] ||= prepare_statement(filter(prepared_statement_key_array(primary_key)), :first)
    78:         end

prepared_refresh() click to toggle source

Return a prepared statement that can be used to refresh a row to get new column values after insertion.

        # File lib/sequel/plugins/prepared_statements.rb, line 81
    81:         def prepared_refresh
    82:           @prepared_statements[:refresh] ||= prepare_statement(naked.clone(:server=>dataset.opts.fetch(:server, :default)).filter(prepared_statement_key_array(primary_key)), :first)
    83:         end

prepared_statement_key_array(keys) click to toggle source

Return an array of two element arrays with the column symbol as the first entry and the placeholder symbol as the second entry.

         # File lib/sequel/plugins/prepared_statements.rb, line 87
     87:         def prepared_statement_key_array(keys)
     88:           if dataset.requires_placeholder_type_specifiers?
     89:             sch = db_schema
     90:             Array(keys).map do |k|
     91:               if (s = sch[k]) && (t = s[:type])
     92:                 [k, :"$#{k}__#{t}"]
     93:               else
     94:                 [k, :"$#{k}"]
     95:               end
     96:             end
     97:           else
     98:             Array(keys).map{|k| [k, :"$#{k}"]}
     99:           end
    100:         end

prepared_statement_key_hash(keys) click to toggle source

Return a hash mapping column symbols to placeholder symbols.

         # File lib/sequel/plugins/prepared_statements.rb, line 103
    103:         def prepared_statement_key_hash(keys)
    104:           Hash[*(prepared_statement_key_array(keys).flatten)]
    105:         end

prepared_update(cols) click to toggle source

Return a prepared statement that can be used to update row using the given columns.

         # File lib/sequel/plugins/prepared_statements.rb, line 108
    108:         def prepared_update(cols)
    109:           @prepared_statements[:update][prepared_columns(cols)] ||= prepare_statement(filter(prepared_statement_key_array(primary_key)), :update, prepared_statement_key_hash(cols))
    110:         end

primary_key_lookup(pk) click to toggle source

Use a prepared statement to query the database for the row matching the given primary key.

         # File lib/sequel/plugins/prepared_statements.rb, line 113
    113:         def primary_key_lookup(pk)
    114:           prepared_lookup.call(primary_key_hash(pk))
    115:         end

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