Class: Og::SqliteAdapter

Inherits:
Adapter show all
Defined in:
lib/og/adapters/sqlite.rb

Overview

The SQLite adapter. This adapter communicates with an SQLite3 rdbms. For extra documentation see lib/og/adapter.rb

Instance Attribute Summary

Attributes inherited from Adapter

#typemap

Instance Method Summary collapse

Methods inherited from Adapter

#create_db, #create_fields, date, encode, escape, #eval_og_insert, #eval_og_oid, #eval_og_read, #eval_og_update, for_name, #initialize, join_table, parse_date, parse_timestamp, #props_for_insert, #read_prop, table, timestamp, #write_prop

Constructor Details

This class inherits a constructor from Og::Adapter

Instance Method Details

#calc_field_index(klass, db) ⇒ Object 



85
86
87
88
89
90
91
92
93
94
95
96
97
 
# File 'lib/og/adapters/sqlite.rb', line 85

def calc_field_index(klass, db)
	res = db.query "SELECT * FROM #{klass::DBTABLE} LIMIT 1"
	meta = db.managed_classes[klass]

	columns = res.columns

	for idx in (0...columns.size)
		meta.field_index[columns[idx]] = idx
	end
 
ensure
	res.close
end

#create_table(klass, db) ⇒ Object 



99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
 
# File 'lib/og/adapters/sqlite.rb', line 99

def create_table(klass, db)
	conn = db.get_connection

	fields = create_fields(klass)

	sql = "CREATE TABLE #{klass::DBTABLE} (#{fields.join(', ')}"
	
	# Create table constrains
	
	if klass.__meta and constrains = klass.__meta[:sql_constrain]
		sql << ", #{constrains.join(', ')}"
	end
	
	sql << ");"
	
	# Create indices
	
	if klass.__meta and indices = klass.__meta[:sql_index]
		for data in indices
			idx, options = *data
			idx = idx.to_s
			pre_sql, post_sql = options[:pre], options[:post]
			idxname = idx.gsub(/ /, "").gsub(/,/, "_").gsub(/\(.*\)/, "")
			sql << " CREATE #{pre_sql} INDEX #{klass::DBTABLE}_#{idxname}_idx #{post_sql} ON #{klass::DBTABLE} (#{idx});"  
		end
	end

	begin
		conn.store.query(sql).close
		Logger.info "Created table '#{klass::DBTABLE}'."
	rescue Exception => ex
		# gmosx: any idea how to better test this?
		if ex.to_s =~ /table .* already exists/i
			Logger.debug "Table already exists" if $DBG
			return
		else
		  raise
		end
	end
	
	# Create join tables if needed. Join tables are used in
	# 'many_to_many' relations.
	
	if klass.__meta and joins = klass.__meta[:sql_join] 
		for data in joins
			# the class to join to and some options.
			join_class, options = *data
			
			# gmosx: dont use DBTABLE here, perhaps the join class
			# is not managed yet.
			join_table = "#{self.class.join_table(klass, join_class)}"
			join_src = "#{self.class.encode(klass)}_oid"
			join_dst = "#{self.class.encode(join_class)}_oid"
			begin
				conn.store.query("CREATE TABLE #{join_table} ( key1 integer NOT NULL, key2 integer NOT NULL )").close
				conn.store.query("CREATE INDEX #{join_table}_key1_idx ON #{join_table} (key1)").close
				conn.store.query("CREATE INDEX #{join_table}_key2_idx ON #{join_table} (key2)").close
			rescue Exception => ex
				# gmosx: any idea how to better test this?
				if ex.to_s =~ /table .* already exists/i
					Logger.debug "Join table already exists" if $DBG
				else
				  raise
				end
			end
		end
	end

ensure
	db.put_connection
end

#drop_db(database, user = nil, password = nil) ⇒ Object 



20
21
22
23
24
25
26
27
 
# File 'lib/og/adapters/sqlite.rb', line 20

def drop_db(database, user = nil, password = nil)
	begin
		FileUtils.rm("#{database}.db")	
		super
	rescue
		Logger.error "Cannot drop '#{database}'!"
	end
end

#insert_code(klass, db, pre_cb, post_cb) ⇒ Object

def write_prop(p) if p.klass.ancestors.include?(Integer) return “@#Og::SqliteAdapter.pp.symbol” elsif p.klass.ancestors.include?(Float) return “@#Og::SqliteAdapter.pp.symbol” elsif p.klass.ancestors.include?(String) return “#Og::SqliteAdapter.selfself.class.escape(@#Og::SqliteAdapter.pp.symbol)” elsif p.klass.ancestors.include?(Time) return %|#Og::SqliteAdapter.@@#{p@#{p.symbol ? “‘#Og::SqliteAdapter#{self#{self.class.timestamp(@#Og::SqliteAdapter.pp.symbol)}’” : ‘NULL’}| elsif p.klass.ancestors.include?(Date) return %|#Og::SqliteAdapter.@@#{p@#{p.symbol ? “‘#Og::SqliteAdapter#{self#{self.class.date(@#Og::SqliteAdapter.pp.symbol)}’” : ‘NULL’}| elsif p.klass.ancestors.include?(TrueClass) return “#Og::SqliteAdapter.@@#{p@#{p.symbol ? "‘t’" : ‘NULL’ }” else return %|#Og::SqliteAdapter.@@#{p@#{p.symbol ? “‘#Og::SqliteAdapter#{self#{self.class.escape(@#Og::SqliteAdapter.pp.symbol.to_yaml)}’” : “””}| end end



47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
 
# File 'lib/og/adapters/sqlite.rb', line 47

def insert_code(klass, db, pre_cb, post_cb)
	props = props_for_insert(klass)
	values = props.collect { |p| write_prop(p) }.join(',') 
	
	sql = "INSERT INTO #{klass::DBTABLE} (#{props.collect {|p| p.name}.join(',')}) VALUES (#{values})"

	%{
		#{pre_cb}
		conn.store.query("#{sql}").close
		@oid = conn.store.last_insert_row_id
		#{post_cb}
	}
=begin		
	props = props_for_insert(klass)
	
	placeholders = Array.new(props.size, '?').join(',')
	values = props.collect { |p| write_prop(p) }.join(',') 
	
	sql = "INSERT INTO #{klass::DBTABLE} (#{props.collect {|p| p.name}.join(',')}) VALUES (#{placeholders})"
	klass.class_eval %{
		cattr_accessor :og_insert_statement
	}

	klass.og_insert_statement = db.prepare(sql) 

	%{
		#{pre_cb}
		@@og_insert_statement.execute(#{values})
		@oid = conn.store.last_insert_row_id
		#{post_cb}
	}
=end
end

#new_connection(db) ⇒ Object 



81
82
83
 
# File 'lib/og/adapters/sqlite.rb', line 81

def new_connection(db)
	return Og::SqliteConnection.new(db)
end