Module: Sequel::Dataset::PreparedStatementMethods

### Home Classes Methods

### In Files

- lib/sequel/dataset/prepared_statements.rb

### Methods

- #call
- #inspect
- #literal_symbol
- #prepared_sql
- #run

### Files

- CHANGELOG
- COPYING
- README.rdoc
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- cheat_sheet.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- migration.rdoc
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- opening_databases.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
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# Sequel::Dataset::PreparedStatementMethods

Backbone of the prepared statement support. Grafts bind variable support into datasets by hijacking literal and using placeholders. By default, emulates prepared statements and bind variables by taking the hash of bind variables and directly substituting them into the query, which works on all databases, as it is no different from using the dataset without bind variables.

### Constants

PLACEHOLDER_RE

### Attributes

prepared_args[RW]

The array/hash of bound variable placeholder names.

prepared_modify_values[RW]

The argument to supply to insert and update, which may use placeholders specified by prepared_args

prepared_type[RW]

The type of prepared statement, should be one of :select, :first, :insert, :update, or :delete

### Public Instance Methods

call(bind_vars={}, &block) click to toggle source

Sets the prepared_args to the given hash and runs the prepared statement.

    # File lib/sequel/dataset/prepared_statements.rb, line 72
    def call(bind_vars={}, &block)
      bind(bind_vars).run(&block)
    end

inspect() click to toggle source

Programmer friendly string showing this is a prepared statement, with the prepared SQL it represents (which in general won’t have substituted variables).

    # File lib/sequel/dataset/prepared_statements.rb, line 108
    def inspect
      "<#{self.class.name}/PreparedStatement #{prepared_sql.inspect}>"
    end

literal_symbol(v) click to toggle source

Changes the values of symbols if they start with $ and prepared_args is present. If so, they are considered placeholders, and they are substituted using prepared_arg.

    # File lib/sequel/dataset/prepared_statements.rb, line 96
    def literal_symbol(v)
      if @opts[:bind_vars] and match = PLACEHOLDER_RE.match(v.to_s)
        v2 = prepared_arg(match[1].to_sym)
        v2 ? literal(v2) : v
      else
        super
      end
    end

prepared_sql() click to toggle source

Returns the SQL for the prepared statement, depending on the type of the statement and the prepared_modify_values.

    # File lib/sequel/dataset/prepared_statements.rb, line 78
    def prepared_sql
      case @prepared_type
      when :select, :all
        select_sql
      when :first
        clone(:limit=>1).select_sql
      when :insert
        insert_sql(*@prepared_modify_values)
      when :update
        update_sql(*@prepared_modify_values)
      when :delete
        delete_sql
      end
    end

### Protected Instance Methods

run(&block) click to toggle source

Run the method based on the type of prepared statement, with :select running all to get all of the rows, and the other types running the method with the same name as the type.

    # File lib/sequel/dataset/prepared_statements.rb, line 117
    def run(&block)
      case @prepared_type
      when :select, :all
        all(&block)
      when :first
        first
      when :insert
        insert(*@prepared_modify_values)
      when :update
        update(*@prepared_modify_values)
      when :delete
        delete
      end
    end

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