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# Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2 of the
# License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
# 02110-1301 USA
import re
from wb import DefineModule
import grt
from db_generic_migration_grt import GenericMigration
ModuleInfo = DefineModule(name= "DbSQLiteMigration", author= "Oracle Corp.", version="1.0")
class SQLiteMigration(GenericMigration):
def migrateColumnDefaultValue(self, state, default_value, source_column, target_column):
target_catalog = target_column.owner.owner.owner
target_default_value = default_value
def raise_on_no_match(re_str, target):
if re.match(re_str, target) is None:
raise ValueError('"%s" does not match the regular expression "%s"' % (target, re_str))
return True
value_validators = [
(['TINYINT', 'SMALLINT', 'INTEGER', 'BIGINT'], int),
(['NUMERIC', 'DECIMAL', 'FLOAT', 'REAL', 'DOUBLE'], float),
(['CHAR', 'VARCHAR', 'NCHAR', 'NVARCHAR', 'TEXT', 'NTEXT' 'UNIQUEIDENTIFIERSTR', 'BINARY', 'LONG BINARY', 'XML'], lambda _:True),
(['VARBIT', 'LONG VARBIT'], lambda val: raise_on_no_match(r"[Bb]?'?[10]+'?", val) ), # E.g. B'101001'
(['DATE'], lambda val: raise_on_no_match(r"(\d{4}|\d{2})-\d{1,2}-\d{1,2}", val) ),
(['TIME'], lambda val: raise_on_no_match(r"(\d{1,2} )?\d{1,2}:\d{0,2}:\d{0,2}", val) ),
(['TIMESTAMP', 'DATETIME'], lambda val: raise_on_no_match(
r"((\d{4}|\d{2})-\d{1,2}-\d{1,2}( (\d{1,2} )?\d{1,2}:\d{0,2}:\d{0,2})?|NOW\(\))", val.upper()) ),
]
source_datatype = None
if source_column.simpleType:
source_datatype = source_column.simpleType.name
else:
return default_value # For user defined columns, use the given default value and hope for the best
if default_value:
default_value_upper = default_value.upper()
if 'BLOB' in source_datatype and not default_value_upper in ('NULL', "X''"):
state.addMigrationLogEntry(1, source_column, target_column,
'Default values are not allowed for BLOB columns in MySQL. '
'The default value "%s" was removed.' % default_value[:100])
return ''
if 'TEXT' in source_datatype and default_value_upper != 'NULL':
state.addMigrationLogEntry(1, source_column, target_column,
'Default values are not allowed for TEXT columns in MySQL. '
'The default value %s was removed.' % default_value)
return ''
if default_value_upper == 'NULL':
if target_column.isNotNull:
state.addMigrationLogEntry(1, source_column, target_column,
'NULL default value found for not nullable column. Removed!')
return ''
else:
target_column.defaultValueIsNull = 1
return 'NULL'
group = source_column.simpleType.group if source_column.simpleType else source_column.userType.actualType.group
if group.name == 'numeric':
target_default_value = default_value.strip("' ")
else:
target_default_value = default_value
for value_validator in value_validators:
if source_datatype in value_validator[0]:
try:
value_validator[1](default_value)
except Exception:
target_default_value = ''
state.addMigrationLogEntry(1, source_column, target_column,
'Default value %s is not supported. Removed!' % default_value)
else:
target_datatype = target_column.simpleType and target_column.simpleType.name or ''
if source_datatype in ['TIMESTAMP', 'DATETIME'] and default_value.upper() in ['NOW()', 'CURRENT TIMESTAMP', 'CURRENT_TIMESTAMP', 'TIMESTAMP']:
if (target_catalog.version.majorNumber, target_catalog.version.minorNumber, target_catalog.version.releaseNumber) < (5, 6, 5):
if target_datatype == 'TIMESTAMP':
target_default_value = 'CURRENT_TIMESTAMP' # now() => CURRENT_TIMESTAMP for TIMESTAMP columns in server v<5.6.5
else:
target_default_value = ''
state.addMigrationLogEntry(1, source_column, target_column,
'Default value %s is not supported for a MySQL column of type "%s".Removed!' % (default_value, target_datatype))
else: # Server version from 5.6.5 and newer
target_default_value = 'CURRENT_TIMESTAMP' # CURRENT_TIMESTAMP freely allowed for DATETIME & TIMESTAMP columns
return target_default_value
def migrateDatatypeForColumn(self, state, source_column, target_column):
targetCatalog = state.targetCatalog
mysql_simpleTypes = dict( (datatype.name.upper(), datatype) for datatype in targetCatalog.simpleDatatypes )
source_type = source_column.simpleType
if not source_type and source_column.userType:
# evaluate user type
source_type = source_column.userType.actualType
if not source_type and source_column.userType.sqlDefinition.startswith('enum('):
target_column.simpleType = mysql_simpleTypes['ENUM']
target_column.datatypeExplicitParams = source_column.userType.sqlDefinition[4:]
return True
target_column.flags.extend(source_column.userType.flags)
if source_type:
# Decide which mysql datatype corresponds to the column datatype:
source_datatype = source_type.name.upper()
# string data types:
target_datatype = ''
if source_datatype in ['VARCHAR', 'NVARCHAR']:
if 0 <= source_column.length < 256:
target_datatype = 'VARCHAR'
elif 0 <= source_column.length < 65536: # MySQL versions > 5.0 can hold up to 65535 chars in a VARCHAR column
if targetCatalog.version.majorNumber < 5:
target_datatype = 'MEDIUMTEXT'
else:
target_datatype = 'VARCHAR'
else:
target_datatype = 'LONGTEXT'
elif source_datatype in ['CHAR', 'NCHAR']:
if source_column.length < 256:
target_datatype = 'CHAR'
else:
target_datatype = 'LONGTEXT'
# integer data types:
elif source_datatype == 'BIT':
target_datatype = 'TINYINT'
elif source_datatype == 'INTEGER':
target_datatype = 'INT'
elif source_datatype in ['SMALLINT', 'INT', 'BIGINT']:
target_datatype = source_datatype
target_column.precision = -1
# numeric
elif source_datatype in ['DECIMAL', 'NUMERIC']:
target_datatype = 'DECIMAL'
# floating point datatypes:
elif source_datatype == 'REAL':
target_datatype = 'FLOAT'
elif source_datatype == 'DOUBLE PRECISION':
target_datatype = 'DOUBLE'
# binary datatypes:
elif source_datatype in ['CLOB', 'TEXT']:
target_datatype = 'LONGTEXT'
elif source_datatype == 'BLOB':
target_datatype = 'LONGBLOB'
# datetime datatypes:
elif source_datatype == 'TIMESTAMP':
target_datatype = 'DATETIME'
elif source_datatype == 'DATE':
target_datatype = 'DATE'
elif source_datatype == 'TIME':
target_datatype = 'TIME'
elif source_datatype == 'DATETIMEOFFSET':
target_datatype = 'TIME'
state.addMigrationLogEntry(0, source_column, target_column,
"Source column type DATETIMEOFFSET was migrated to TIME")
# others
else:
# just fall back to same type name and hope for the best
target_datatype = source_datatype
if mysql_simpleTypes.has_key(target_datatype):
target_column.simpleType = mysql_simpleTypes[target_datatype]
else:
grt.log_warning("SQLite migrateTableColumnsToMySQL", "Can't find datatype %s for type %s\n" % (target_datatype, source_datatype))
state.addMigrationLogEntry(2, source_column, target_column,
'Could not migrate column "%s" in "%s": Unknown datatype "%s"' % (target_column.name, source_column.owner.name, source_datatype) )
return False
return True
else:
state.addMigrationLogEntry(2, source_column, target_column,
'Could not migrate type of column "%s" in "%s" (%s)' % (target_column.name, source_column.owner.name, source_column.formattedRawType) )
return False
return True
def migrateUpdateForChanges(self, state, target_catalog):
"""
Create datatype cast expression for target column based on source datatype.
"""
return target_catalog
def migrateTableForeignKeyToMySQL(self, state, source_fk, targetTable):
target_fk = super(SQLiteMigration, self).migrateTableForeignKeyToMySQL(state, source_fk, targetTable)
if target_fk:
for column, referenced_column in zip(target_fk.columns, target_fk.referencedColumns):
if column.simpleType != referenced_column.simpleType or column.length != referenced_column.length:
state.addMigrationLogEntry(1, source_fk, target_fk,
'The column %s.%s references %s.%s but its data type is %s instead of %s. '
'Data type changed to %s.' % (column.owner.name, column.name,
referenced_column.owner.name, referenced_column.name,
column.formattedType, referenced_column.formattedType, referenced_column.formattedType
)
)
if column.simpleType != referenced_column.simpleType:
column.owner.customData['columnTypeCastExpression:%s' % column.name] = '?::%s as ?' % referenced_column.simpleType.name
column.simpleType = referenced_column.simpleType
column.length = referenced_column.length
if column.isNotNull:
if target_fk.updateRule == 'SET NULL':
target_fk.updateRule = 'NO ACTION'
state.addMigrationLogEntry(1, source_fk, target_fk,
'Cannot have a SET NULL update rule: referencing column %s.%s does not allow nulls. '
'Update rule changed to NO ACTION' % (column.owner.name, column.name)
)
if target_fk.deleteRule == 'SET NULL':
target_fk.deleteRule = 'NO ACTION'
state.addMigrationLogEntry(1, source_fk, target_fk,
'Cannot have a SET NULL delete rule: referencing column %s.%s does not allow nulls. '
'Delete rule changed to NO ACTION' % (column.owner.name, column.name)
)
return target_fk
def migrateTablePrimaryKeyToMySQL(self, state, sourceTable, targetTable):
res = GenericMigration.migrateTablePrimaryKeyToMySQL(self, state, sourceTable, targetTable)
if targetTable.primaryKey:
for icolumn in targetTable.primaryKey.columns:
if not icolumn.referencedColumn.isNotNull:
icolumn.referencedColumn.isNotNull = 1
icolumn.referencedColumn.defaultValueIsNull = 0
icolumn.referencedColumn.defaultValue = ''
# force primary keys to be NOT NULL
state.addMigrationLogEntry(1, sourceTable, targetTable,
'Source table has a PRIMARY KEY allowing NULL values, which is not supported by MySQL. Column was changed to NOT NULL.')
return res
instance = SQLiteMigration()
@ModuleInfo.export(grt.STRING)
def getTargetDBMSName():
return 'SQLite'
@ModuleInfo.export(grt.STRING, grt.STRING, grt.classes.GrtLogObject)
def migrateIdentifier(name, log):
return instance.migrateIdentifier(name, log)
@ModuleInfo.export(grt.classes.db_Catalog, grt.classes.db_migration_Migration, grt.classes.db_Catalog)
def migrateCatalog(state, source_catalog):
return instance.migrateCatalog(state, source_catalog)
@ModuleInfo.export(grt.classes.db_Schema, grt.classes.db_migration_Migration, grt.classes.db_Schema, grt.classes.db_Catalog)
def migrateSchema(state, sourceSchema, targetCatalog):
return instance.migrateSchema(state, sourceSchema, targetCatalog)
@ModuleInfo.export(grt.classes.db_Table, grt.classes.db_migration_Migration, grt.classes.db_Table, grt.classes.db_Schema)
def migrateTableToMySQL(state, sourceTable, target_schema):
return instance.migrateTableToMySQL(state, sourceTable, target_schema)
@ModuleInfo.export(grt.INT, grt.classes.db_migration_Migration, grt.classes.db_Table, grt.classes.db_Table)
def migrateTableToMySQL2ndPass(state, sourceTable, targetTable):
return instance.migrateTableToMySQL2ndPass(state, sourceTable, targetTable)
@ModuleInfo.export(grt.classes.db_mysql_ForeignKey, grt.classes.db_migration_Migration, grt.classes.db_ForeignKey, grt.classes.db_Table)
def migrateTableForeignKeyToMySQL(state, source_fk, targetTable):
return instance.migrateTableForeignKeyToMySQL(state, source_fk, targetTable)
@ModuleInfo.export(grt.classes.db_mysql_Trigger, grt.classes.db_migration_Migration, grt.classes.db_Trigger, grt.classes.db_Table)
def migrateTriggerToMySQL(state, source_trigger, target_table):
return instance.migrateTriggerToMySQL(state, source_trigger, target_table)
@ModuleInfo.export(grt.classes.db_mysql_View, grt.classes.db_migration_Migration, grt.classes.db_View, grt.classes.db_Schema)
def migrateViewToMySQL(state, source_view, target_schema):
return instance.migrateViewToMySQL(state, source_view, target_schema)
@ModuleInfo.export(grt.classes.db_mysql_Routine, grt.classes.db_migration_Migration, grt.classes.db_Routine, grt.classes.db_Schema)
def migrateRoutineToMySQL(state, source_routine, target_schema):
return instance.migrateRoutineToMySQL(state, source_routine, target_schema)
@ModuleInfo.export(grt.classes.db_Catalog, grt.classes.db_migration_Migration, grt.classes.db_Catalog)
def migrateUpdateForChanges(state, target_catalog):
return instance.migrateUpdateForChanges(state, target_catalog)
@ModuleInfo.export((grt.LIST, grt.classes.db_migration_MigrationParameter), grt.classes.db_migration_Migration)
def getMigrationOptions(state):
list = grt.List(grt.OBJECT, grt.classes.db_migration_MigrationParameter.__grtclassname__)
param = grt.classes.db_migration_MigrationParameter()
param.name = "sqlite:migrateTimestampAsDatetime"
param.caption = "Migrate TIMESTAMP values as DATETIME by default. TIMESTAMP values in MySQL have a limited time range."
param.paramType = "boolean"
list.append(param)
return list
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