class SchemaEvolutionManager::Scripts
Constants
- BOOTSTRAP_SCRIPTS
- SCRIPTS
- VALID_TABLE_NAMES
Public Class Methods
all(dir)
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Returns a sorted list of the full file paths to any sql scripts in the specified directory
# File lib/schema-evolution-manager/scripts.rb, line 23 def Scripts.all(dir) Preconditions.assert_class(dir, String) if File.directory?(dir) Dir.glob("#{dir}/*.sql").sort else [] end end
new(db, table_name)
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@param db Instance of Db
class @param table_name Name of the table used to record which scripts we have processed. Will be one of ‘scripts’ or ‘bootstrap_scripts’
# File lib/schema-evolution-manager/scripts.rb, line 14 def initialize(db, table_name) @db = Preconditions.assert_class(db, Db) @table_name = Preconditions.assert_class(table_name, String) Preconditions.check_state(VALID_TABLE_NAMES.include?(@table_name), "Invalid table name[%s]. Must be one of: %s" % [@table_name, VALID_TABLE_NAMES.join(", ")]) end
Public Instance Methods
each_pending(dir) { |filename, files| ... }
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For each sql script that needs to be applied to this database, yields a pair of |filename, fullpath| in proper order
db = Db.new(host, user, name)
scripts = Scripts.new(db)
scripts.each_pending do |filename, path|
puts filename
end
# File lib/schema-evolution-manager/scripts.rb, line 41 def each_pending(dir) files = {} Scripts.all(dir).each do |path| name = File.basename(path) files[name] = path end scripts_previously_run(files.keys).each do |filename| files.delete(filename) end files.keys.sort.each do |filename| ## We have to recheck if this script is still pending. Some ## upgrade scripts may modify the scripts table themselves. This ## is actually useful in cases like when we migrated gilt from ## util_schema => schema_evolution_manager schema if !has_run?(filename) yield filename, files[filename] end end end
has_run?(filename)
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True if this script has already been applied to the db. False otherwise.
# File lib/schema-evolution-manager/scripts.rb, line 65 def has_run?(filename) if @db.schema_schema_evolution_manager_exists? query = "select count(*) from %s.%s where filename = '%s'" % [Db.schema_name, @table_name, filename] @db.psql_command(query).to_i > 0 else false end end
record_as_run!(filename)
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Inserts a record to indiciate that we have loaded the specified file.
# File lib/schema-evolution-manager/scripts.rb, line 75 def record_as_run!(filename) Preconditions.check_state(filename.match(/^\d\d\d\d\d\d+\-\d\d\d\d\d\d\.sql$/), "Invalid filename[#{filename}]. Must be like: 20120503-173242.sql") command = "insert into %s.%s (filename) select '%s' where not exists (select 1 from %s.%s where filename = '%s')" % [Db.schema_name, @table_name, filename, Db.schema_name, @table_name, filename] @db.psql_command(command) end
Private Instance Methods
scripts_previously_run(scripts)
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Fetch the list of scripts that have already been applied to this database.
# File lib/schema-evolution-manager/scripts.rb, line 85 def scripts_previously_run(scripts) if scripts.empty? || !@db.schema_schema_evolution_manager_exists? [] else sql = "select filename from %s.%s where filename in (%s)" % [Db.schema_name, @table_name, "'" + scripts.join("', '") + "'"] @db.psql_command(sql).strip.split end end