Module: Sequel::MSSQL::DatabaseMethods

Includes:
Database::SplitAlterTable
Included in:
ADO::MSSQL::DatabaseMethods, JDBC::MSSQL::DatabaseMethods, ODBC::MSSQL::DatabaseMethods, TinyTDS::Database
Defined in:
lib/sequel/adapters/shared/mssql.rb

Constant Summary collapse

FOREIGN_KEY_ACTION_MAP = 
{0 => :no_action, 1 => :cascade, 2 => :set_null, 3 => :set_default}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#like_without_collate ⇒ Object

Whether to use LIKE without COLLATE Latin1_General_CS_AS. Skipping the COLLATE can significantly increase performance in some cases.



29
30
31
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 29

def like_without_collate
  @like_without_collate
end

#mssql_unicode_strings ⇒ Object

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.



25
26
27
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 25

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 arguments, 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

Because Sequel datasets only support a single result set per query, and retrieving the result code and number of rows requires a query, this does not support stored procedures which also return result sets. To handle such stored procedures, you should drop down to the connection/driver level by using Sequel::Database#synchronize to get access to the underlying connection object.

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.public_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_type ⇒ Object 



116
117
118
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 116

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.



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
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 127

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
  fk = Sequel[:fk]
  fkc = Sequel[:fkc]
  ds = metadata_dataset.from(Sequel.lit('[sys].[foreign_keys]').as(:fk)).
    join(Sequel.lit('[sys].[foreign_key_columns]').as(:fkc), :constraint_object_id => :object_id).
    join(Sequel.lit('[sys].[all_columns]').as(:pc), :object_id => fkc[:parent_object_id],     :column_id => fkc[:parent_column_id]).
    join(Sequel.lit('[sys].[all_columns]').as(: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].as(:column), 
            rc[:name].as(: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

#freeze ⇒ Object 



168
169
170
171
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 168

def freeze
  server_version
  super
end

#global_index_namespace? ⇒ Boolean

Microsoft SQL Server namespaces indexes per table.

Returns:

  • (Boolean) 


121
122
123
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 121

def global_index_namespace?
  false
end

#indexes(table, opts = OPTS) ⇒ Object

Use the system tables to get index information



174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 174

def indexes(table, opts=OPTS)
  m = output_identifier_meth
  im = input_identifier_meth
  indexes = {}
  table = table.value if table.is_a?(Sequel::SQL::Identifier)
  i = Sequel[:i]
  ds = metadata_dataset.from(Sequel.lit('[sys].[tables]').as(:t)).
   join(Sequel.lit('[sys].[indexes]').as(:i), :object_id=>:object_id).
   join(Sequel.lit('[sys].[index_columns]').as(:ic), :object_id=>:object_id, :index_id=>:index_id).
   join(Sequel.lit('[sys].[columns]').as(:c), :object_id=>:object_id, :column_id=>:column_id).
   select(i[:name], i[:is_unique], Sequel[:c][:name].as(:column)).
   where{{t[:name]=>im.call(table)}}.
   where(i[:is_primary_key]=>0, i[:is_disabled]=>0).
   order(i[:name], Sequel[: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).



202
203
204
205
206
207
208
209
210
211
212
213
214
215
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 202

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 = /^(\d+)\.(\d+)\.(\d+)/.match(fetch("SELECT CAST(SERVERPROPERTY('ProductVersion') AS varchar)").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) 


218
219
220
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 218

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

#supports_savepoints? ⇒ Boolean

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

Returns:

  • (Boolean) 


223
224
225
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 223

def supports_savepoints?
  true
end

#supports_transaction_isolation_levels? ⇒ Boolean

MSSQL supports transaction isolation levels

Returns:

  • (Boolean) 


228
229
230
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 228

def supports_transaction_isolation_levels?
  true
end

#supports_transactional_ddl? ⇒ Boolean

MSSQL supports transaction DDL statements.

Returns:

  • (Boolean) 


233
234
235
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 233

def supports_transactional_ddl?
  true
end

#tables(opts = OPTS) ⇒ Object

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



239
240
241
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 239

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.



245
246
247
 
# File 'lib/sequel/adapters/shared/mssql.rb', line 245

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