Module: Sequel::MSSQL::DatabaseMethods

Constant Summary collapse

AUTO_INCREMENT =
'IDENTITY(1,1)'.freeze
SERVER_VERSION_RE =
/^(\d+)\.(\d+)\.(\d+)/.freeze
SERVER_VERSION_SQL =
"SELECT CAST(SERVERPROPERTY('ProductVersion') AS varchar)".freeze
SQL_BEGIN =
"BEGIN TRANSACTION".freeze
SQL_COMMIT =
"COMMIT TRANSACTION".freeze
SQL_ROLLBACK =
"IF @@TRANCOUNT > 0 ROLLBACK TRANSACTION".freeze
SQL_ROLLBACK_TO_SAVEPOINT =
'IF @@TRANCOUNT > 0 ROLLBACK TRANSACTION autopoint_%d'.freeze
SQL_SAVEPOINT =
'SAVE TRANSACTION autopoint_%d'.freeze
MSSQL_DEFAULT_RE =
/\A(?:\(N?('.*')\)|\(\((-?\d+(?:\.\d+)?)\)\))\z/
FOREIGN_KEY_ACTION_MAP =
{0 => :no_action, 1 => :cascade, 2 => :set_null, 3 => :set_default}.freeze
DECIMAL_TYPE_RE =

The types to check for 0 scale to transform :decimal types to :integer.

/number|numeric|decimal/io

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Database::ResetIdentifierMangling

extended

Instance Attribute Details

#mssql_unicode_stringsObject

Whether to use N” to quote strings, which allows unicode characters inside the strings. True by default for compatibility, can be set to false for a possible performance increase. This sets the default for all datasets created from this Database object.



26
27
28
# File 'lib/sequel/adapters/shared/mssql.rb', line 26

def mssql_unicode_strings
  @mssql_unicode_strings
end

Instance Method Details

#call_mssql_sproc(name, opts = OPTS) ⇒ Object

Execute the given stored procedure with the given name.

Options:

:args

Arguments to stored procedure. For named argumetns, this should be a hash keyed by argument named. For unnamed arguments, this should be an array. Output parameters to the function are specified using :output. You can also name output parameters and provide a type by using an array containing :output, the type name, and the parameter name.

:server

The server/shard on which to execute the procedure.

This method returns a single hash with the following keys:

:result

The result code of the stored procedure

:numrows

The number of rows affected by the stored procedure

output params

Values for any output paramters, using the name given for the output parameter

Examples:

DB.call_mssql_sproc(:SequelTest, {:args => ['input arg', :output]})
DB.call_mssql_sproc(:SequelTest, {:args => ['input arg', [:output, 'int', 'varname']]})

named params:
DB.call_mssql_sproc(:SequelTest, :args => {
  'input_arg1_name' => 'input arg1 value',
  'input_arg2_name' => 'input arg2 value',
  'output_arg_name' => [:output, 'int', 'varname']
})


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
# File 'lib/sequel/adapters/shared/mssql.rb', line 64

def call_mssql_sproc(name, opts=OPTS)
  args = opts[:args] || []
  names = ['@RC AS RESULT', '@@ROWCOUNT AS NUMROWS']
  declarations = ['@RC int']
  values = []

  if args.is_a?(Hash)
    named_args = true
    args = args.to_a
    method = :each
  else
    method = :each_with_index
  end

  args.send(method) do |v, i|
    if named_args
      k = v
      v, type, select = i
      raise Error, "must provide output parameter name when using output parameters with named arguments" if v == :output && !select
    else
      v, type, select = v
    end

    if v == :output
      type ||= "nvarchar(max)"
      if named_args
        varname = select
      else
        varname = "var#{i}"
        select ||= varname
      end
      names << "@#{varname} AS #{quote_identifier(select)}"
      declarations << "@#{varname} #{type}"
      value = "@#{varname} OUTPUT"
    else
      value = literal(v)
    end

    if named_args
      value = "@#{k}=#{value}"
    end

    values << value
  end

  sql = "DECLARE #{declarations.join(', ')}; EXECUTE @RC = #{name} #{values.join(', ')}; SELECT #{names.join(', ')}"

  ds = dataset.with_sql(sql)
  ds = ds.server(opts[:server]) if opts[:server]
  ds.first
end

#database_typeObject

Microsoft SQL Server uses the :mssql type.



117
118
119
# File 'lib/sequel/adapters/shared/mssql.rb', line 117

def database_type
  :mssql
end

#foreign_key_list(table, opts = OPTS) ⇒ Object

Return foreign key information using the system views, including :name, :on_delete, and :on_update entries in the hashes.



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
# File 'lib/sequel/adapters/shared/mssql.rb', line 128

def foreign_key_list(table, opts=OPTS)
  m = output_identifier_meth
  im = input_identifier_meth
  schema, table = schema_and_table(table)
  current_schema = m.call(get(Sequel.function('schema_name')))
  fk_action_map = FOREIGN_KEY_ACTION_MAP
  ds = .from(:sys__foreign_keys___fk).
    join(:sys__foreign_key_columns___fkc, :constraint_object_id => :object_id).
    join(:sys__all_columns___pc, :object_id => :fkc__parent_object_id,     :column_id => :fkc__parent_column_id).
    join(:sys__all_columns___rc, :object_id => :fkc__referenced_object_id, :column_id => :fkc__referenced_column_id).
    where{{object_schema_name(:fk__parent_object_id) => im.call(schema || current_schema)}}.
    where{{object_name(:fk__parent_object_id) => im.call(table)}}.
    select{[:fk__name, 
            :fk__delete_referential_action, 
            :fk__update_referential_action, 
            :pc__name___column, 
            :rc__name___referenced_column, 
            object_schema_name(:fk__referenced_object_id).as(:schema), 
            object_name(:fk__referenced_object_id).as(:table)]}.
    order(:fk__name, :fkc__constraint_column_id)
  h = {}
  ds.each do |row|
    if r = h[row[:name]]
      r[:columns] << m.call(row[:column])
      r[:key] << m.call(row[:referenced_column])
    else
      referenced_schema = m.call(row[:schema])
      referenced_table = m.call(row[:table])
      h[row[:name]] = { :name      => m.call(row[:name]), 
                        :table     => (referenced_schema == current_schema) ? referenced_table : Sequel.qualify(referenced_schema, referenced_table),
                        :columns   => [m.call(row[:column])], 
                        :key       => [m.call(row[:referenced_column])], 
                        :on_update => fk_action_map[row[:update_referential_action]], 
                        :on_delete => fk_action_map[row[:delete_referential_action]] }
    end
  end
  h.values
end

#global_index_namespace?Boolean

Microsoft SQL Server namespaces indexes per table.

Returns:

  • (Boolean)


122
123
124
# File 'lib/sequel/adapters/shared/mssql.rb', line 122

def global_index_namespace?
  false
end

#indexes(table, opts = OPTS) ⇒ Object

Use the system tables to get index information



168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
# File 'lib/sequel/adapters/shared/mssql.rb', line 168

def indexes(table, opts=OPTS)
  m = output_identifier_meth
  im = input_identifier_meth
  indexes = {}
  ds = .from(:sys__tables___t).
   join(:sys__indexes___i, :object_id=>:object_id).
   join(:sys__index_columns___ic, :object_id=>:object_id, :index_id=>:index_id).
   join(:sys__columns___c, :object_id=>:object_id, :column_id=>:column_id).
   select(:i__name, :i__is_unique, :c__name___column).
   where{{t__name=>im.call(table)}}.
   where(:i__is_primary_key=>0, :i__is_disabled=>0).
   order(:i__name, :ic__index_column_id)

  if supports_partial_indexes?
    ds = ds.where(:i__has_filter=>0)
  end

  ds.each do |r|
    index = indexes[m.call(r[:name])] ||= {:columns=>[], :unique=>(r[:is_unique] && r[:is_unique]!=0)}
    index[:columns] << m.call(r[:column])
  end
  indexes
end

#server_version(server = nil) ⇒ Object

The version of the MSSQL server, as an integer (e.g. 10001600 for SQL Server 2008 Express).



194
195
196
197
198
199
200
201
202
203
204
205
206
207
# File 'lib/sequel/adapters/shared/mssql.rb', line 194

def server_version(server=nil)
  return @server_version if @server_version
  if @opts[:server_version]
    return @server_version = Integer(@opts[:server_version])
  end
  @server_version = synchronize(server) do |conn|
    (conn.server_version rescue nil) if conn.respond_to?(:server_version)
  end
  unless @server_version
    m = SERVER_VERSION_RE.match(fetch(SERVER_VERSION_SQL).single_value.to_s)
    @server_version = (m[1].to_i * 1000000) + (m[2].to_i * 10000) + m[3].to_i
  end
  @server_version
end

#supports_partial_indexes?Boolean

MSSQL 2008+ supports partial indexes.

Returns:

  • (Boolean)


210
211
212
# File 'lib/sequel/adapters/shared/mssql.rb', line 210

def supports_partial_indexes?
  dataset.send(:is_2008_or_later?)
end

#supports_savepoints?Boolean

MSSQL supports savepoints, though it doesn’t support committing/releasing them savepoint

Returns:

  • (Boolean)


215
216
217
# File 'lib/sequel/adapters/shared/mssql.rb', line 215

def supports_savepoints?
  true
end

#supports_transaction_isolation_levels?Boolean

MSSQL supports transaction isolation levels

Returns:

  • (Boolean)


220
221
222
# File 'lib/sequel/adapters/shared/mssql.rb', line 220

def supports_transaction_isolation_levels?
  true
end

#supports_transactional_ddl?Boolean

MSSQL supports transaction DDL statements.

Returns:

  • (Boolean)


225
226
227
# File 'lib/sequel/adapters/shared/mssql.rb', line 225

def supports_transactional_ddl?
  true
end

#tables(opts = OPTS) ⇒ Object

Microsoft SQL Server supports using the INFORMATION_SCHEMA to get information on tables.



231
232
233
# File 'lib/sequel/adapters/shared/mssql.rb', line 231

def tables(opts=OPTS)
  information_schema_tables('BASE TABLE', opts)
end

#views(opts = OPTS) ⇒ Object

Microsoft SQL Server supports using the INFORMATION_SCHEMA to get information on views.



237
238
239
# File 'lib/sequel/adapters/shared/mssql.rb', line 237

def views(opts=OPTS)
  information_schema_tables('VIEW', opts)
end