engine

Documentation

Overview

Package engine executes logic operations on sequences.

Index

• Constants
• type Column
• type DbEngine
  • func New() *DbEngine
  • func (engine *DbEngine) CreateTable(command *ast.CreateCommand)
  • func (engine *DbEngine) DeleteFromTable(deleteCommand *ast.DeleteCommand, whereCommand *ast.WhereCommand)
  • func (engine *DbEngine) InsertIntoTable(command *ast.InsertCommand)
  • func (engine *DbEngine) SelectFromTable(command *ast.SelectCommand) *Table
  • func (engine *DbEngine) SelectFromTableWithOrderBy(selectCommand *ast.SelectCommand, orderByCommand *ast.OrderByCommand) *Table
  • func (engine *DbEngine) SelectFromTableWithWhere(selectCommand *ast.SelectCommand, whereCommand *ast.WhereCommand) *Table
  • func (engine *DbEngine) SelectFromTableWithWhereAndOrderBy(selectCommand *ast.SelectCommand, whereCommand *ast.WhereCommand, ...) *Table
• type IntegerValue
  • func (value IntegerValue) GetType() SupportedTypes
  • func (value IntegerValue) IsEqual(valueInterface ValueInterface) bool
  • func (value IntegerValue) ToString() string
• type StringValue
  • func (value StringValue) GetType() SupportedTypes
  • func (value StringValue) IsEqual(valueInterface ValueInterface) bool
  • func (value StringValue) ToString() string
• type SupportedTypes
• type Table
  • func (table *Table) ToString() string
• type ValueInterface

Constants

const (
	IntType = iota
	StringType
)

Types

type Column

type Column struct {
	Name   string
	Type   token.Token
	Values []ValueInterface
}

Column - part of the Table containing name of Column and values in it

type DbEngine

type DbEngine struct {
	Tables map[string]*Table
}

func New

func New() *DbEngine

New Return new DbEngine struct

func (*DbEngine) CreateTable

func (engine *DbEngine) CreateTable(command *ast.CreateCommand)

CreateTable - initialize new table in engine with specified name

func (*DbEngine) DeleteFromTable

func (engine *DbEngine) DeleteFromTable(deleteCommand *ast.DeleteCommand, whereCommand *ast.WhereCommand)

DeleteFromTable - Delete all rows of data from table that match given condition

func (*DbEngine) InsertIntoTable

func (engine *DbEngine) InsertIntoTable(command *ast.InsertCommand)

InsertIntoTable - Insert row of values into the table

func (*DbEngine) SelectFromTable

func (engine *DbEngine) SelectFromTable(command *ast.SelectCommand) *Table

SelectFromTable - Return Table containing all values requested by SelectCommand

func (*DbEngine) SelectFromTableWithOrderBy

func (engine *DbEngine) SelectFromTableWithOrderBy(selectCommand *ast.SelectCommand, orderByCommand *ast.OrderByCommand) *Table

SelectFromTableWithOrderBy - Return Table containing all values requested by SelectCommand and sorted by OrderByCommand

func (*DbEngine) SelectFromTableWithWhere

func (engine *DbEngine) SelectFromTableWithWhere(selectCommand *ast.SelectCommand, whereCommand *ast.WhereCommand) *Table

SelectFromTableWithWhere - Return Table containing all values requested by SelectCommand and filtered by WhereCommand

func (*DbEngine) SelectFromTableWithWhereAndOrderBy

func (engine *DbEngine) SelectFromTableWithWhereAndOrderBy(selectCommand *ast.SelectCommand, whereCommand *ast.WhereCommand, orderByCommand *ast.OrderByCommand) *Table

SelectFromTableWithWhereAndOrderBy - Return Table containing all values requested by SelectCommand, filtered by WhereCommand and sorted by OrderByCommand

type IntegerValue

type IntegerValue struct {
	Value int
}

IntegerValue - Implementation of ValueInterface that is containing integer values

func (IntegerValue) GetType

func (value IntegerValue) GetType() SupportedTypes

GetType implementations

func (IntegerValue) IsEqual

func (value IntegerValue) IsEqual(valueInterface ValueInterface) bool

IsEqual implementations

func (IntegerValue) ToString

func (value IntegerValue) ToString() string

ToString implementations

type StringValue

type StringValue struct {
	Value string
}

StringValue - Implementation of ValueInterface that is containing string values

func (StringValue) GetType

func (value StringValue) GetType() SupportedTypes

func (StringValue) IsEqual

func (value StringValue) IsEqual(valueInterface ValueInterface) bool

func (StringValue) ToString

func (value StringValue) ToString() string

type SupportedTypes

type SupportedTypes int

type Table

type Table struct {
	Columns []*Column
}

Table - Contain Columns that store values in engine

func (*Table) ToString

func (table *Table) ToString() string

ToString - Return string contain all values and Column names in Table

type ValueInterface

type ValueInterface interface {
	ToString() string
	GetType() SupportedTypes
	IsEqual(valueInterface ValueInterface) bool
	// contains filtered or unexported methods
}

ValueInterface - Represent all supported types of data that can be inserted into Table