本文整理汇总了Python中bsddb.db.DB属性的典型用法代码示例。如果您正苦于以下问题：Python db.DB属性的具体用法？Python db.DB怎么用？Python db.DB使用的例子？那么恭喜您, 这里精选的属性代码示例或许可以为您提供帮助。您也可以进一步了解该属性所在类bsddb.db的用法示例。
在下文中一共展示了db.DB属性的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: CreateTable
# 需要导入模块: from bsddb import db [as 别名]
# 或者: from bsddb.db import DB [as 别名]
def CreateTable(self, table, columns):
"""CreateTable(table, columns) - Create a new table in the database.
raises TableDBError if it already exists or for other DB errors.
"""
assert isinstance(columns, list)
txn = None
try:
# checking sanity of the table and column names here on
# table creation will prevent problems elsewhere.
if contains_metastrings(table):
raise ValueError(
"bad table name: contains reserved metastrings")
for column in columns :
if contains_metastrings(column):
raise ValueError(
"bad column name: contains reserved metastrings")
columnlist_key = _columns_key(table)
if getattr(self.db, "has_key")(columnlist_key):
raise TableAlreadyExists, "table already exists"
txn = self.env.txn_begin()
# store the table's column info
getattr(self.db, "put_bytes", self.db.put)(columnlist_key,
pickle.dumps(columns, 1), txn=txn)
# add the table name to the tablelist
tablelist = pickle.loads(getattr(self.db, "get_bytes",
self.db.get) (_table_names_key, txn=txn, flags=db.DB_RMW))
tablelist.append(table)
# delete 1st, in case we opened with DB_DUP
self.db.delete(_table_names_key, txn=txn)
getattr(self.db, "put_bytes", self.db.put)(_table_names_key,
pickle.dumps(tablelist, 1), txn=txn)
txn.commit()
txn = None
except db.DBError, dberror:
if txn:
txn.abort()
if sys.version_info < (2, 6) :
raise TableDBError, dberror[1]
else :
raise TableDBError, dberror.args[1]