From e29f02e1bd4d424f7b0294958251aa49e88d688e Mon Sep 17 00:00:00 2001 From: Ryuta Kamizono Date: Sun, 20 Sep 2015 14:15:27 +0900 Subject: Refactor `table_exists?` in AbstractMysqlAdapter `table_exists?` calls `tables` twice when passed `'dbname.tblname'` arg. This change is that `table_exists?` execute only once query always and extra args of `tables` is removed. --- .../connection_adapters/abstract_mysql_adapter.rb | 27 ++++++++-------------- .../test/cases/adapters/mysql2/schema_test.rb | 8 ------- activerecord/test/cases/test_case.rb | 2 +- 3 files changed, 10 insertions(+), 27 deletions(-) diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb index 97f54dc0b0..feb41e96f0 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb @@ -625,33 +625,24 @@ module ActiveRecord show_variable 'collation_database' end - def tables(name = nil, database = nil, like = nil) #:nodoc: - sql = "SHOW TABLES " - sql << "IN #{quote_table_name(database)} " if database - sql << "LIKE #{quote(like)}" if like - - execute_and_free(sql, 'SCHEMA') do |result| - result.collect(&:first) - end + def tables(name = nil) # :nodoc: + select_values("SHOW FULL TABLES", 'SCHEMA') end def truncate(table_name, name = nil) execute "TRUNCATE TABLE #{quote_table_name(table_name)}", name end - def table_exists?(name) - return false unless name.present? - return true if tables(nil, nil, name).any? + def table_exists?(table_name) + return false unless table_name.present? - name = name.to_s - schema, table = name.split('.', 2) + schema, name = table_name.to_s.split('.', 2) + schema, name = @config[:database], schema unless name # A table was provided without a schema - unless table # A table was provided without a schema - table = schema - schema = nil - end + sql = "SELECT table_name FROM information_schema.tables " + sql << "WHERE table_schema = #{quote(schema)} AND table_name = #{quote(name)}" - tables(nil, schema, table).any? + select_values(sql, 'SCHEMA').any? end def views # :nodoc: diff --git a/activerecord/test/cases/adapters/mysql2/schema_test.rb b/activerecord/test/cases/adapters/mysql2/schema_test.rb index 880a2123d2..faf2acb9cb 100644 --- a/activerecord/test/cases/adapters/mysql2/schema_test.rb +++ b/activerecord/test/cases/adapters/mysql2/schema_test.rb @@ -36,14 +36,6 @@ module ActiveRecord assert(!@connection.table_exists?("#{@db_name}.zomg"), "table should not exist") end - def test_tables_quoting - @connection.tables(nil, "foo-bar", nil) - flunk - rescue => e - # assertion for *quoted* database properly - assert_match(/database 'foo-bar'/, e.inspect) - end - def test_dump_indexes index_a_name = 'index_key_tests_on_snack' index_b_name = 'index_key_tests_on_pizza' diff --git a/activerecord/test/cases/test_case.rb b/activerecord/test/cases/test_case.rb index f93e85f5e2..47e664f4e7 100644 --- a/activerecord/test/cases/test_case.rb +++ b/activerecord/test/cases/test_case.rb @@ -103,7 +103,7 @@ module ActiveRecord # ignored SQL, or better yet, use a different notification for the queries # instead examining the SQL content. oracle_ignored = [/^select .*nextval/i, /^SAVEPOINT/, /^ROLLBACK TO/, /^\s*select .* from all_triggers/im, /^\s*select .* from all_constraints/im, /^\s*select .* from all_tab_cols/im] - mysql_ignored = [/^SHOW TABLES/i, /^SHOW FULL FIELDS/, /^SHOW CREATE TABLE /i, /^SHOW VARIABLES /, /^\s*SELECT column_name\b.*\bFROM information_schema\.key_column_usage\b/im] + mysql_ignored = [/^SHOW FULL TABLES/i, /^SHOW FULL FIELDS/, /^SHOW CREATE TABLE /i, /^SHOW VARIABLES /, /^\s*SELECT (?:column_name|table_name)\b.*\bFROM information_schema\.(?:key_column_usage|tables)\b/im] postgresql_ignored = [/^\s*select\b.*\bfrom\b.*pg_namespace\b/im, /^\s*select tablename\b.*from pg_tables\b/im, /^\s*select\b.*\battname\b.*\bfrom\b.*\bpg_attribute\b/im, /^SHOW search_path/i] sqlite3_ignored = [/^\s*SELECT name\b.*\bFROM sqlite_master/im, /^\s*SELECT sql\b.*\bFROM sqlite_master/im] -- cgit v1.2.3