Module: ActiveRecord::ConnectionAdapters::PostgreSQL::SchemaStatements

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 241

def client_min_messages=(level)
  execute("SET client_min_messages TO '#{level}'", "SCHEMA")
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 231

def schema_search_path
  @schema_search_path ||= query_value("SHOW search_path", "SCHEMA")
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 223

def schema_search_path=(schema_csv)
  if schema_csv
    execute("SET search_path TO #{schema_csv}", "SCHEMA")
    @schema_search_path = schema_csv
  end
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 188

def collation
  query_value("SELECT datcollate FROM pg_database WHERE datname = current_database()", "SCHEMA")
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 22

def create_database(name, options = {})
  options = { encoding: "utf8" }.merge!(options.symbolize_keys)

  option_string = options.inject("") do |memo, (key, value)|
    memo += case key
            when :owner
              " OWNER = \"#{value}\""
            when :template
              " TEMPLATE = \"#{value}\""
            when :encoding
              " ENCODING = '#{value}'"
            when :collation
              " LC_COLLATE = '#{value}'"
            when :ctype
              " LC_CTYPE = '#{value}'"
            when :tablespace
              " TABLESPACE = \"#{value}\""
            when :connection_limit
              " CONNECTION LIMIT = #{value}"
            else
              ""
    end
  end

  execute "CREATE DATABASE #{quote_table_name(name)}#{option_string}"
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 209

def create_schema(schema_name)
  execute "CREATE SCHEMA #{quote_schema_name(schema_name)}"
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 193

def ctype
  query_value("SELECT datctype FROM pg_database WHERE datname = current_database()", "SCHEMA")
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 173

def current_database
  query_value("SELECT current_database()", "SCHEMA")
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 178

def current_schema
  query_value("SELECT current_schema", "SCHEMA")
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 214

def drop_schema(schema_name, options = {})
  execute "DROP SCHEMA#{' IF EXISTS' if options[:if_exists]} #{quote_schema_name(schema_name)} CASCADE"
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 183

def encoding
  query_value("SELECT pg_encoding_to_char(encoding) FROM pg_database WHERE datname = current_database()", "SCHEMA")
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 503

def foreign_keys(table_name)
  scope = quoted_scope(table_name)
  fk_info = exec_query(<<-SQL.strip_heredoc, "SCHEMA")
    SELECT t2.oid::regclass::text AS to_table, a1.attname AS column, a2.attname AS primary_key, c.conname AS name, c.confupdtype AS on_update, c.confdeltype AS on_delete, c.convalidated AS valid
    FROM pg_constraint c
    JOIN pg_class t1 ON c.conrelid = t1.oid
    JOIN pg_class t2 ON c.confrelid = t2.oid
    JOIN pg_attribute a1 ON a1.attnum = c.conkey[1] AND a1.attrelid = t1.oid
    JOIN pg_attribute a2 ON a2.attnum = c.confkey[1] AND a2.attrelid = t2.oid
    JOIN pg_namespace t3 ON c.connamespace = t3.oid
    WHERE c.contype = 'f'
      AND t1.relname = #{scope[:name]}
      AND t3.nspname = #{scope[:schema]}
    ORDER BY c.conname
  SQL

  fk_info.map do |row|
    options = {
      column: row["column"],
      name: row["name"],
      primary_key: row["primary_key"]
    }

    options[:on_delete] = extract_foreign_key_action(row["on_delete"])
    options[:on_update] = extract_foreign_key_action(row["on_update"])
    options[:validate] = row["valid"]

    ForeignKeyDefinition.new(table_name, row["to_table"], options)
  end
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 538

def foreign_table_exists?(table_name)
  query_values(data_source_sql(table_name, type: "FOREIGN TABLE"), "SCHEMA").any? if table_name.present?
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 534

def foreign_tables
  query_values(data_source_sql(type: "FOREIGN TABLE"), "SCHEMA")
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 67

def index_name_exists?(table_name, index_name)
  table = quoted_scope(table_name)
  index = quoted_scope(index_name)

  query_value(<<-SQL, "SCHEMA").to_i > 0
    SELECT COUNT(*)
    FROM pg_class t
    INNER JOIN pg_index d ON t.oid = d.indrelid
    INNER JOIN pg_class i ON d.indexrelid = i.oid
    LEFT JOIN pg_namespace n ON n.oid = i.relnamespace
    WHERE i.relkind = 'i'
      AND i.relname = #{index[:name]}
      AND t.relname = #{table[:name]}
      AND n.nspname = #{index[:schema]}
  SQL
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 497

def rename_index(table_name, old_name, new_name)
  validate_index_length!(table_name, new_name)

  execute "ALTER INDEX #{quote_column_name(old_name)} RENAME TO #{quote_table_name(new_name)}"
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 402

def rename_table(table_name, new_name)
  clear_cache!
  execute "ALTER TABLE #{quote_table_name(table_name)} RENAME TO #{quote_table_name(new_name)}"
  pk, seq = pk_and_sequence_for(new_name)
  if pk
    idx = "#{table_name}_pkey"
    new_idx = "#{new_name}_pkey"
    execute "ALTER INDEX #{quote_table_name(idx)} RENAME TO #{quote_table_name(new_idx)}"
    if seq && seq.identifier == "#{table_name}_#{pk}_seq"
      new_seq = "#{new_name}_#{pk}_seq"
      execute "ALTER TABLE #{seq.quoted} RENAME TO #{quote_table_name(new_seq)}"
    end
  end
  rename_table_indexes(table_name, new_name)
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 62

def schema_exists?(name)
  query_value("SELECT COUNT(*) FROM pg_namespace WHERE nspname = #{quote(name)}", "SCHEMA").to_i > 0
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 198

def schema_names
  query_values(<<-SQL, "SCHEMA")
    SELECT nspname
      FROM pg_namespace
     WHERE nspname !~ '^pg_.*'
       AND nspname NOT IN ('information_schema')
     ORDER by nspname;
  SQL
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 254

def serial_sequence(table, column)
  query_value("SELECT pg_get_serial_sequence(#{quote(table)}, #{quote(column)})", "SCHEMA")
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 602

def validate_constraint(table_name, constraint_name)
  return unless supports_validate_constraints?

  at = create_alter_table table_name
  at.validate_constraint constraint_name

  execute schema_creation.accept(at)
end

# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 626

def validate_foreign_key(from_table, options_or_to_table = {})
  return unless supports_validate_constraints?

  fk_name_to_validate = foreign_key_for!(from_table, options_or_to_table).name

  validate_constraint from_table, fk_name_to_validate
end