Class: Coopy::SqliteHelper

Inherits:
Object
  • Object
show all
Defined in:
lib/lib/coopy/sqlite_helper.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SqliteHelper

Returns a new instance of SqliteHelper.



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# File 'lib/lib/coopy/sqlite_helper.rb', line 7

def initialize
end

Instance Method Details

#_delete(db, name, conds) ⇒ Object 



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# File 'lib/lib/coopy/sqlite_helper.rb', line 73

def _delete(db,name,conds)
  q = "DELETE FROM " + _hx_str(db.get_quoted_table_name(name)) + " WHERE "
  lst = Array.new
  _it = ::Rb::RubyIterator.new(conds.keys)
  while(_it.has_next) do
    k = _it._next
    q += " and " if lst.length > 0
    q += db.get_quoted_column_name(k)
    q += " = ?"
    lst.push(conds[k])
  end
  if !db._begin(q,lst,[]) 
    puts "Problem with database delete"
    return false
  end
  db._end
  true
end

#alter_columns(db, name, columns) ⇒ Object 



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# File 'lib/lib/coopy/sqlite_helper.rb', line 248

def alter_columns(db,name,columns)
  not_blank = lambda {|x|
    return false if x == nil || x == "" || x == "null"
    true
  }
  sql = self.fetch_schema(db,name)
  schema = self.split_schema(db,name,sql)
  parts = schema[:parts]
  nparts = Array.new
  new_column_list = Array.new
  ins_column_list = Array.new
  sel_column_list = Array.new
  meta = schema[:columns]
  begin
    _g1 = 0
    _g = columns.length
    while(_g1 < _g) 
      i = _g1
      _g1+=1
      c = columns[i]
      if c.name != nil 
        if c.prev_name != nil 
          sel_column_list.push(c.prev_name)
          ins_column_list.push(c.name)
        end
        orig_type = ""
        orig_primary = false
        if schema[:name2column].include?(c.name) 
          m = schema[:name2column][c.name]
          orig_type = m.type_value
          orig_primary = m.primary
        end
        next_type = orig_type
        next_primary = orig_primary
        if c.props != nil 
          _g2 = 0
          _g3 = c.props
          while(_g2 < _g3.length) 
            p = _g3[_g2]
            _g2+=1
            next_type = p.val if p.name == "type"
            next_primary = "" + _hx_str(p.val.to_s) == "primary" if p.name == "key"
          end
        end
        part = "" + _hx_str(c.name)
        part += " " + _hx_str(next_type) if not_blank.call(next_type)
        part += " PRIMARY KEY" if next_primary
        nparts.push(part)
        new_column_list.push(c.name)
      end
    end
  end
  return false if !self.exec(db,"BEGIN TRANSACTION")
  c1 = self.column_list_sql(ins_column_list)
  tname = db.get_quoted_table_name(name)
  return false if !self.exec(db,"CREATE TEMPORARY TABLE __coopy_backup(" + _hx_str(c1) + ")")
  return false if !self.exec(db,"INSERT INTO __coopy_backup (" + _hx_str(c1) + ") SELECT " + _hx_str(c1) + " FROM " + _hx_str(tname))
  return false if !self.exec(db,"DROP TABLE " + _hx_str(tname))
  return false if !self.exec(db,_hx_str(schema[:preamble]) + "(" + _hx_str(nparts.join(", ")) + ")")
  return false if !self.exec(db,"INSERT INTO " + _hx_str(tname) + " (" + _hx_str(c1) + ") SELECT " + _hx_str(c1) + " FROM __coopy_backup")
  return false if !self.exec(db,"DROP TABLE __coopy_backup")
  return false if !self.exec(db,"COMMIT")
  true
end

#attach(db, tag, resource_name) ⇒ Object 



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# File 'lib/lib/coopy/sqlite_helper.rb', line 120

def attach(db,tag,resource_name)
  tag_present = false
  tag_correct = false
  result = Array.new
  q = "PRAGMA database_list"
  return false if !db._begin(q,nil,["seq","name","file"])
  while(db.read) 
    name = db.get(1)
    if name == tag 
      tag_present = true
      file = db.get(2)
      tag_correct = true if file == resource_name
    end
  end
  db._end
  if tag_present 
    return true if tag_correct
    if !db._begin("DETACH `" + _hx_str(tag) + "`",nil,[]) 
      puts "Failed to detach " + _hx_str(tag)
      return false
    end
    db._end
  end
  if !db._begin("ATTACH ? AS `" + _hx_str(tag) + "`",[resource_name],[]) 
    puts "Failed to attach " + _hx_str(resource_name) + " as " + _hx_str(tag)
    return false
  end
  db._end
  true
end

#count_rows(db, name) ⇒ Object 



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# File 'lib/lib/coopy/sqlite_helper.rb', line 21

def count_rows(db,name)
  q = "SELECT COUNT(*) AS ct FROM " + _hx_str(db.get_quoted_table_name(name))
  return -1 if !db._begin(q,nil,["ct"])
  ct = -1
  while(db.read) 
    ct = db.get(0)
  end
  db._end
  ct
end

#get_row_ids(db, name) ⇒ Object 



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# File 'lib/lib/coopy/sqlite_helper.rb', line 32

def get_row_ids(db,name)
  result = Array.new
  q = "SELECT ROWID AS r FROM " + _hx_str(db.get_quoted_table_name(name)) + " ORDER BY ROWID"
  return nil if !db._begin(q,nil,["r"])
  while(db.read) 
    c = db.get(0)
    result.push(c)
  end
  db._end
  result
end

#get_table_names(db) ⇒ Object 



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# File 'lib/lib/coopy/sqlite_helper.rb', line 10

def get_table_names(db)
  q = "SELECT name FROM sqlite_master WHERE type='table' ORDER BY name"
  return nil if !db._begin(q,nil,["name"])
  names = Array.new
  while(db.read) 
    names.push(db.get(0))
  end
  db._end
  names
end

#insert(db, name, vals) ⇒ Object 



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# File 'lib/lib/coopy/sqlite_helper.rb', line 92

def insert(db,name,vals)
  q = "INSERT INTO " + _hx_str(db.get_quoted_table_name(name)) + " ("
  lst = Array.new
  _it = ::Rb::RubyIterator.new(vals.keys)
  while(_it.has_next) do
    k = _it._next
    q += "," if lst.length > 0
    q += db.get_quoted_column_name(k)
    lst.push(vals[k])
  end
  q += ") VALUES("
  need_comma = false
  _it2 = ::Rb::RubyIterator.new(vals.keys)
  while(_it2.has_next) do
    k1 = _it2._next
    q += "," if need_comma
    q += "?"
    need_comma = true
  end
  q += ")"
  if !db._begin(q,lst,[]) 
    puts "Problem with database insert"
    return false
  end
  db._end
  true
end

#update(db, name, conds, vals) ⇒ Object 



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# File 'lib/lib/coopy/sqlite_helper.rb', line 44

def update(db,name,conds,vals)
  q = "UPDATE " + _hx_str(db.get_quoted_table_name(name)) + " SET "
  lst = Array.new
  _it = ::Rb::RubyIterator.new(vals.keys)
  while(_it.has_next) do
    k = _it._next
    q += ", " if lst.length > 0
    q += db.get_quoted_column_name(k)
    q += " = ?"
    lst.push(vals[k])
  end
  val_len = lst.length
  q += " WHERE "
  _it2 = ::Rb::RubyIterator.new(conds.keys)
  while(_it2.has_next) do
    k1 = _it2._next
    q += " and " if lst.length > val_len
    q += db.get_quoted_column_name(k1)
    q += " IS ?"
    lst.push(conds[k1])
  end
  if !db._begin(q,lst,[]) 
    puts "Problem with database update"
    return false
  end
  db._end
  true
end