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table.add_column(name, type) method, refs #15

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This commit is contained in:
Simon Willison 2019-02-24 11:40:26 -08:00
commit dc2560879e
3 changed files with 108 additions and 30 deletions
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70
sqlite_utils/db.py
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@ -19,6 +19,36 @@ ForeignKey = namedtuple(
)
Index = namedtuple("Index", ("seq", "name", "unique", "origin", "partial", "columns"))
COLUMN_TYPE_MAPPING = {
float: "FLOAT",
int: "INTEGER",
bool: "INTEGER",
str: "TEXT",
bytes.__class__: "BLOB",
bytes: "BLOB",
datetime.datetime: "TEXT",
datetime.date: "TEXT",
datetime.time: "TEXT",
None.__class__: "TEXT",
}
# If numpy is available, add more types
if np:
COLUMN_TYPE_MAPPING.update(
{
np.int8: "INTEGER",
np.int16: "INTEGER",
np.int32: "INTEGER",
np.int64: "INTEGER",
np.uint8: "INTEGER",
np.uint16: "INTEGER",
np.uint32: "INTEGER",
np.uint64: "INTEGER",
np.float16: "FLOAT",
np.float32: "FLOAT",
np.float64: "FLOAT",
}
)
class Database:
def __init__(self, filename_or_conn):
@ -67,39 +97,10 @@ class Database:
column_items.insert(0, (hash_id, str))
pk = hash_id
extra = ""
col_type_mapping = {
float: "FLOAT",
int: "INTEGER",
bool: "INTEGER",
str: "TEXT",
bytes.__class__: "BLOB",
bytes: "BLOB",
datetime.datetime: "TEXT",
datetime.date: "TEXT",
datetime.time: "TEXT",
None.__class__: "TEXT",
}
# If numpy is available, add more types
if np:
col_type_mapping.update(
{
np.int8: "INTEGER",
np.int16: "INTEGER",
np.int32: "INTEGER",
np.int64: "INTEGER",
np.uint8: "INTEGER",
np.uint16: "INTEGER",
np.uint32: "INTEGER",
np.uint64: "INTEGER",
np.float16: "FLOAT",
np.float32: "FLOAT",
np.float64: "FLOAT",
}
)
columns_sql = ",\n".join(
" [{col_name}] {col_type}{primary_key}{references}".format(
col_name=col_name,
col_type=col_type_mapping[col_type],
col_type=COLUMN_TYPE_MAPPING[col_type],
primary_key=" PRIMARY KEY" if (pk == col_name) else "",
references=(
" REFERENCES [{other_table}]([{other_column}])".format(
@ -254,6 +255,15 @@ class Table:
self.db.conn.execute(sql)
return self
def add_column(self, col_name, col_type):
sql = "ALTER TABLE [{table}] ADD COLUMN [{col_name}] {col_type};".format(
table=self.name,
col_name=col_name,
col_type=COLUMN_TYPE_MAPPING[col_type],
)
self.db.conn.execute(sql)
return self
def drop(self):
return self.db.conn.execute("DROP TABLE {}".format(self.name))