1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
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
|
module ActiveRecord
module ConnectionAdapters # :nodoc:
# TODO: Document me!
module SchemaStatements
def native_database_types #:nodoc:
{}
end
# def tables(name = nil) end
# Returns an array of indexes for the given table.
# def indexes(table_name, name = nil) end
# Returns an array of column objects for the table specified by +table_name+.
def columns(table_name, name = nil) end
def create_table(name, options = {})
table_definition = TableDefinition.new(self)
table_definition.primary_key(options[:primary_key] || "id") unless options[:id] == false
yield table_definition
create_sql = "CREATE#{' TEMPORARY' if options[:temporary]} TABLE "
create_sql << "#{name} ("
create_sql << table_definition.to_sql
create_sql << ") #{options[:options]}"
execute create_sql
end
def drop_table(name)
execute "DROP TABLE #{name}"
end
def add_column(table_name, column_name, type, options = {})
add_column_sql = "ALTER TABLE #{table_name} ADD #{column_name} #{type_to_sql(type, options[:limit])}"
add_column_options!(add_column_sql, options)
execute(add_column_sql)
end
def remove_column(table_name, column_name)
execute "ALTER TABLE #{table_name} DROP #{column_name}"
end
def change_column(table_name, column_name, type, options = {})
raise NotImplementedError, "change_column is not implemented"
end
def change_column_default(table_name, column_name, default)
raise NotImplementedError, "change_column_default is not implemented"
end
def rename_column(table_name, column_name, new_column_name)
raise NotImplementedError, "rename_column is not implemented"
end
# Create a new index on the given table. By default, it will be named
# <code>"#{table_name}_#{column_name.to_a.first}_index"</code>, but you
# can explicitly name the index by passing <code>:name => "..."</code>
# as the last parameter. Unique indexes may be created by passing
# <code>:unique => true</code>.
def add_index(table_name, column_name, options = {})
index_name = "#{table_name}_#{column_name.to_a.first}_index"
if Hash === options # legacy support, since this param was a string
index_type = options[:unique] ? "UNIQUE" : ""
index_name = options[:name] || index_name
else
index_type = options
end
execute "CREATE #{index_type} INDEX #{index_name} ON #{table_name} (#{column_name.to_a.join(", ")})"
end
# Remove the given index from the table.
#
# remove_index :my_table, :column => :foo
# remove_index :my_table, :name => :my_index_on_foo
#
# The first version will remove the index named
# <code>"#{my_table}_#{column}_index"</code> from the table. The
# second removes the named column from the table.
def remove_index(table_name, options = {})
if Hash === options # legacy support
if options[:column]
index_name = "#{table_name}_#{options[:column]}_index"
elsif options[:name]
index_name = options[:name]
else
raise ArgumentError, "You must specify the index name"
end
else
index_name = "#{table_name}_#{options}_index"
end
execute "DROP INDEX #{index_name} ON #{table_name}"
end
# Returns a string of the CREATE TABLE SQL statements for recreating the entire structure of the database.
def structure_dump #:nodoc:
end
def initialize_schema_information #:nodoc:
begin
execute "CREATE TABLE schema_info (version #{type_to_sql(:integer)})"
execute "INSERT INTO schema_info (version) VALUES(0)"
rescue ActiveRecord::StatementInvalid
# Schema has been intialized
end
end
def dump_schema_information #:nodoc:
begin
if (current_schema = ActiveRecord::Migrator.current_version) > 0
return "INSERT INTO schema_info (version) VALUES (#{current_schema});"
end
rescue ActiveRecord::StatementInvalid
# No Schema Info
end
end
def type_to_sql(type, limit = nil) #:nodoc:
native = native_database_types[type]
limit ||= native[:limit]
column_type_sql = native[:name]
column_type_sql << "(#{limit})" if limit
column_type_sql
end
def add_column_options!(sql, options) #:nodoc:
sql << " NOT NULL" if options[:null] == false
sql << " DEFAULT #{quote(options[:default], options[:column])}" unless options[:default].nil?
end
end
end
end
|
