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# Copyright (c) 2012, 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
from workbench.utils import find_object_with_name
import grt
from db_sql92_migration_grt import Sql92Migration
from db_generic_migration_grt import GenericMigration
ModuleInfo = DefineModule(name= "DbPostgresqlMigration", author= "Oracle Corp.", version="1.0")
class PostgresqlMigration(Sql92Migration):
def migrateColumnDefaultValue(self, state, default_value, source_column, target_column):
source_table = source_column.owner
source_schema = source_table.owner
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 = [
(['SMALLINT', 'INT', 'BIGINT'], int),
(['NUMERIC', 'DECIMAL', 'FLOAT', 'REAL', 'DOUBLE PRECISION'], float),
(['CHAR', 'VARCHAR', 'NCHAR', 'NVARCHAR', 'BLOB', 'CLOB', 'XML'], lambda _:True),
(['BIT', 'BIT VARYING'], 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'], 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})?|NULL|NOW\(\))", val.upper()) ),
(['BOOLEAN'], lambda val: raise_on_no_match(r'(TRUE|FALSE|NULL)', val.upper()) ),
]
seq_regex = re.compile(r"nextval[(]'(.*?)'::regclass[)]")
source_datatype = None
if source_column.simpleType:
source_datatype = source_column.simpleType.name
if default_value:
match = seq_regex.match(default_value)
if match and target_column.simpleType and target_column.simpleType.group.name == 'numeric':
seq = find_object_with_name(source_schema.sequences, match.group(1))
if seq:
pk_cols = set(column.referencedColumn.name for column in source_table.primaryKey.columns) if source_table.primaryKey else set()
if source_column.name in pk_cols: # AUTO_INCREMENT can only be used on columns in a key
try:
start = int(seq.startValue)
except ValueError:
pass
else:
if start > 1:
target_column.owner.nextAutoInc = seq.startValue
target_column.autoIncrement = 1
return ''
if target_column.simpleType.group.name == 'numeric':
default_value = default_value.strip("' ")
if default_value:
if '::' in default_value:
default_value = default_value.split('::', 1)[0]
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 == 'BOOLEAN':
val = default_value.upper()
if val == 'TRUE':
target_default_value = '1'
elif val == 'FALSE':
target_default_value = '0'
elif source_datatype == 'TIMESTAMP' and default_value.upper()=='NOW()':
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 now() is not supported for a MySQL column of type "%s".Removed!' % 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 == 'VARCHAR':
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 == 'CHAR':
if source_column.length < 256:
target_datatype = 'CHAR'
else:
target_datatype = 'LONGTEXT'
# integer data types:
elif source_datatype in ['SMALLINT', 'INT', 'BIGINT']:
target_datatype = source_datatype
target_column.precision = -1
elif source_datatype == 'SMALLSERIAL':
target_datatype = 'SMALLINT'
target_column.autoIncrement = 1
elif source_datatype == 'SERIAL':
target_datatype = 'INTEGER'
target_column.autoIncrement = 1
elif source_datatype == 'BIGSERIAL':
target_datatype = 'BIGINT'
target_column.autoIncrement = 1
# numeric
elif source_datatype in ['DECIMAL', 'NUMERIC']:
target_datatype = 'DECIMAL'
elif source_datatype == 'MONEY':
target_datatype = 'DECIMAL'
target_column.precision = 19
target_column.scale = 2
# floating point datatypes:
elif source_datatype == 'REAL':
target_datatype = 'FLOAT'
elif source_datatype == 'DOUBLE PRECISION':
target_datatype = 'DOUBLE'
# binary datatypes:
elif source_datatype == 'BYTEA':
target_datatype = 'LONGBLOB'
elif source_datatype == 'TEXT':
target_datatype = 'LONGTEXT'
# 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 == 'INTERVAL':
target_datatype = 'TIME'
state.addMigrationLogEntry(0, source_column, target_column,
"Source column type INTERVAL was migrated to TIME")
elif source_datatype in ['BIT', 'BIT VARYING']:
target_datatype = 'BIT'
elif source_datatype == 'BOOLEAN':
target_datatype = 'TINYINT'
target_column.length = 1
# network address types
elif source_datatype == 'CIDR':
target_datatype = 'VARCHAR'
target_column.length = 43
elif source_datatype == 'INET':
target_datatype = 'VARCHAR'
target_column.length = 43
elif source_datatype == 'MACADDR':
target_datatype = 'VARCHAR'
target_column.length = 17
# others
elif source_datatype == 'UUID':
target_datatype = 'VARCHAR'
target_column.length = 36
elif source_datatype in ['XML', 'JSON', 'TSVECTOR', 'TSQUERY', 'ARRAY']:
target_datatype = 'LONGTEXT'
elif source_datatype in ['POINT', 'LINE', 'LSEG', 'BOX', 'PATH', 'POLYGON', 'CIRCLE', 'TXID_SNAPSHOT']:
target_datatype = 'VARCHAR'
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("PostgreSQL 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.
"""
for targetSchema in target_catalog.schemata:
for targetTable in targetSchema.tables:
for target_column in targetTable.columns:
# SQL expression to use for converting the column data to the target type
# eg.: CAST(? as NVARCHAR(max))
type_cast_expression = None
source_datatype = None
source_column = state.lookupSourceObject(target_column)
if source_column:
source_datatype = GenericMigration.getColumnDataType(self, source_column)
if source_column and source_datatype:
if source_datatype == 'BOOLEAN':
type_cast_expression = 'CASE WHEN ? THEN 1 ELSE 0 END'
if type_cast_expression:
target_column.owner.customData["columnTypeCastExpression:%s" % target_column.name] = "%s as ?" % type_cast_expression
return target_catalog
def migrateTableForeignKeyToMySQL(self, state, source_fk, targetTable):
target_fk = super(PostgresqlMigration, 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
instance = PostgresqlMigration()
@ModuleInfo.export(grt.STRING)
def getTargetDBMSName():
return 'Postgresql'
@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 = "postgresql: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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