sqliteschema
Summary
sqliteschema is a Python library to dump table schema of a SQLite database file.
Installation
Install from PyPI
pip install sqliteschema
Install optional dependencies
pip install sqliteschema[cli] # to use CLI pip install sqliteschema[dumps] # to use dumps method pip install sqliteschema[logging] # to use logging
Install from PPA (for Ubuntu)
sudo add-apt-repository ppa:thombashi/ppa sudo apt update sudo apt install python3-sqliteschema
Usage
Full example source code can be found at examples/get_table_schema.py
Extract SQLite Schemas as dict
| Sample Code: |
import json
import sqliteschema
extractor = sqliteschema.SQLiteSchemaExtractor(sqlite_db_path)
print(
"--- dump all of the table schemas into a dictionary ---\n{}\n".format(
json.dumps(extractor.fetch_database_schema_as_dict(), indent=4)
)
)
print(
"--- dump a specific table schema into a dictionary ---\n{}\n".format(
json.dumps(extractor.fetch_table_schema("sampletable1").as_dict(), indent=4)
)
) |
|---|---|
| Output: |
--- dump all of the table schemas into a dictionary ---
{
"sampletable0": [
{
"Field": "attr_a",
"Index": false,
"Type": "INTEGER",
"Nullable": "YES",
"Key": "",
"Default": "NULL",
"Extra": ""
},
{
"Field": "attr_b",
"Index": false,
"Type": "INTEGER",
"Nullable": "YES",
"Key": "",
"Default": "NULL",
"Extra": ""
}
],
"sampletable1": [
{
"Field": "foo",
"Index": true,
"Type": "INTEGER",
"Nullable": "YES",
"Key": "",
"Default": "NULL",
"Extra": ""
},
{
"Field": "bar",
"Index": false,
"Type": "REAL",
"Nullable": "YES",
"Key": "",
"Default": "NULL",
"Extra": ""
},
{
"Field": "hoge",
"Index": true,
"Type": "TEXT",
"Nullable": "YES",
"Key": "",
"Default": "NULL",
"Extra": ""
}
],
"constraints": [
{
"Field": "primarykey_id",
"Index": true,
"Type": "INTEGER",
"Nullable": "YES",
"Key": "PRI",
"Default": "NULL",
"Extra": ""
},
{
"Field": "notnull_value",
"Index": false,
"Type": "REAL",
"Nullable": "NO",
"Key": "",
"Default": "",
"Extra": ""
},
{
"Field": "unique_value",
"Index": true,
"Type": "INTEGER",
"Nullable": "YES",
"Key": "UNI",
"Default": "NULL",
"Extra": ""
}
]
}
--- dump a specific table schema into a dictionary ---
{
"sampletable1": [
{
"Field": "foo",
"Index": true,
"Type": "INTEGER",
"Nullable": "YES",
"Key": "",
"Default": "NULL",
"Extra": ""
},
{
"Field": "bar",
"Index": false,
"Type": "REAL",
"Nullable": "YES",
"Key": "",
"Default": "NULL",
"Extra": ""
},
{
"Field": "hoge",
"Index": true,
"Type": "TEXT",
"Nullable": "YES",
"Key": "",
"Default": "NULL",
"Extra": ""
}
]
}
|
Extract SQLite Schemas as Tabular Text
Table schemas can be output with the dumps method.
The dumps method requires an additional package that can be installed as follows:
pip install sqliteschema[dumps]
Usage is as follows:
| Sample Code: |
import sqliteschema
extractor = sqliteschema.SQLiteSchemaExtractor(sqlite_db_path)
for verbosity_level in range(2):
print("--- dump all of the table schemas with a tabular format: verbosity_level={} ---".format(
verbosity_level))
print(extractor.dumps(output_format="markdown", verbosity_level=verbosity_level))
for verbosity_level in range(2):
print("--- dump a specific table schema with a tabular format: verbosity_level={} ---".format(
verbosity_level))
print(extractor.fetch_table_schema("sampletable1").dumps(
output_format="markdown", verbosity_level=verbosity_level)) |
|---|---|
| Output: |
--- dump all of the table schemas with a tabular format: verbosity_level=0 ---
# sampletable0
| Field | Type |
| ------ | ------- |
| attr_a | INTEGER |
| attr_b | INTEGER |
# sampletable1
| Field | Type |
| ----- | ------- |
| foo | INTEGER |
| bar | REAL |
| hoge | TEXT |
# constraints
| Field | Type |
| ------------- | ------- |
| primarykey_id | INTEGER |
| notnull_value | REAL |
| unique_value | INTEGER |
--- dump all of the table schemas with a tabular format: verbosity_level=1 ---
# sampletable0
| Field | Type | Nullable | Key | Default | Index | Extra |
| ------ | ------- | -------- | --- | ------- | :---: | ----- |
| attr_a | INTEGER | YES | | NULL | | |
| attr_b | INTEGER | YES | | NULL | | |
# sampletable1
| Field | Type | Nullable | Key | Default | Index | Extra |
| ----- | ------- | -------- | --- | ------- | :---: | ----- |
| foo | INTEGER | YES | | NULL | X | |
| bar | REAL | YES | | NULL | | |
| hoge | TEXT | YES | | NULL | X | |
# constraints
| Field | Type | Nullable | Key | Default | Index | Extra |
| ------------- | ------- | -------- | --- | ------- | :---: | ----- |
| primarykey_id | INTEGER | YES | PRI | NULL | X | |
| notnull_value | REAL | NO | | | | |
| unique_value | INTEGER | YES | UNI | NULL | X | |
--- dump a specific table schema with a tabular format: verbosity_level=0 ---
# sampletable1
| Field | Type |
| ----- | ------- |
| foo | INTEGER |
| bar | REAL |
| hoge | TEXT |
--- dump a specific table schema with a tabular format: verbosity_level=1 ---
# sampletable1
| Field | Type | Nullable | Key | Default | Index | Extra |
| ----- | ------- | -------- | --- | ------- | :---: | ----- |
| foo | INTEGER | YES | | NULL | X | |
| bar | REAL | YES | | NULL | | |
| hoge | TEXT | YES | | NULL | X | |
|
CLI Usage
| Sample Code: |
pip install --upgrade sqliteschema[cli]
python3 -m sqliteschema <PATH/TO/SQLITE_FILE> |
|---|
Dependencies
Optional dependencies
-
- loguru
-
- Used for logging if the package installed
-
- pytablewriter
-
- Required when getting table schemas with tabular text by
dumpsmethod
- Required when getting table schemas with tabular text by
