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A simple database API

Project description

pydbapi

Installation

pip install pydbapi

支持的数据库类型

  • sqlite
from pydbapi.api import SqliteDB
db = SqliteDB(database=None)  # 或者传入路径
sql = 'select * from [table];'
cursor, action, result = db.execute(sql)
  • Amazon Redshift
from pydbapi.api import RedshiftDB
db = RedshiftDB(host, user, password, database, port='5439', safe_rule=True)
sql = 'select * from [schema].[table];'
cursor, action, result = db.execute(sql)
  • Mysql
from pydbapi.api import MysqlDB
db = MysqlDB(host, user, password, database, port=3306, safe_rule=True, isdoris=False)
sql = 'select * from [table];'
cursor, action, result = db.execute(sql)
  • Trino
from pydbapi.api import TrinoDB
db = TrinoDB(host, user, password, database, catalog, port=8443, safe_rule=True)
sql = 'select * from [table];'
cursor, action, result = db.execute(sql)
  • Snowflake(删除)
from pydbapi.api import SnowflakeDB
db = SnowflakeDB(user, password, account, warehouse, database, schema, safe_rule=True)
sql = 'select * from [table];'
cursor, action, result = db.execute(sql)
  • instance模式
from pydbapi.api import SqliteDB
db = SqliteDB.get_instance(database=None)  # 或者传入路径
sql = 'select * from [table];'
cursor, action, result = db.execute(sql)

Result

  • 转换成dataframe
from pydbapi.api import TrinoDB
db = TrinoDB(host, user, password, database, catalog, port=8443, safe_rule=True)
sql = 'select * from [table];'
cursor, action, result = db.execute(sql)

df = result.to_dataframe()
df
  • 输出到csv
from pydbapi.api import TrinoDB
db = TrinoDB(host, user, password, database, catalog, port=8443, safe_rule=True)
sql = 'select * from [table];'
cursor, action, result = db.execute(sql)

result.to_csv(outfile)

Column

from pydbapi.model import ColumnModel

  • ColumnModel

    • 代码 col = ColumnModel(newname, coltype='varchar', sqlexpr=None, func=None, order=0)
    • params
      • newname: 新命名;
      • coltype: 类型
      • sqlexpr: 查询sql表达式
      • func: 查询函数,暂时支持'min', 'max', 'sum', 'count'
      • order: 排序
  • ColumnsModel

    • 代码 cols = ColumnsModel(ColumnModel, ColumnModel, ……)
    • property
      • func_cols: 返回col列表
      • nonfunc_cols: 返回col列表
      • new_cols: 返回拼接字符串
      • create_cols: 返回拼接字符串
      • select_cols: 返回拼接字符串
      • group_cols: 返回拼接字符串
      • order_cols: 返回拼接字符串
    • mothed
      • get_column_by_name
        • cols.get_column_by_name(name)
        • 返回ColumnModel

Sql

  • SqlStatement
from pydbapi.sql import SqlStatement
sql = 'select * from tablename where part_date >= $part_date;'
sqlstmt = SqlStatement(sql)
  • 属性

    • tokens
    • sql
    • comment
    • action
    • tablename
    • params
    • subqueries
  • 方法

    • from_sqlsnippets
    sstmt1 = '-- comment'
    sqlstmt = SqlStatement.from_sqlsnippets(sstmt1, sql)
    
    • add
    sstmt2 = 'and part_date <= $end_date'
    sqlstmt += sstmt2
    
    • sub
    sqlstmt -= sstmt2
    
    • substitute_params
    sqlstmt = sqlstmt.substitute_params(part_date="'2024-01-01'")
    
    • get_with_testsql(only support CETs)
    sqlstmt = sqlstmt.get_with_testsql(idx=1)
    
  • SqlStatements

from pydbapi.sql import SqlStatements
sql = '''
    select * from tablename1 where part_date >= $part_date;
    select * from tablename2 where part_date >= $part_date;
'''
sqlstmts = SqlStatements(sql)
  • 属性

    • statements
    • SqlStatement的属性
  • 方法

    • SqlStatement
    sqlstmts = sqlstmts.substitute_params(part_date='2024-01-01')
    
    • iter
    for stmts in sqlstmts:
        stmts
    
    • len
    len(sqlstmts)
    
    • getitem
    sqlstmts[0]
    sqlstmts[:2]
    

支持的操作

  • execute【db/base.py】
    • 代码
      db.execute(sql, count=None, ehandling=None, verbose=0)
    • params
      • count: 返回结果的数量;
      • ehandling: sql执行出错的时候处理方式, default: None
      • verbose: 执行的进度展示方式(0:不打印, 1:文字进度, 2:进度条)
  • select
    • 代码
      db.select(tablename, columns, condition=None, verbose=0)
    • params
      • tablename: 表名;
      • columns: 列内容;
      • condition: sql where 中的条件
  • create
    • sqlite/redshift
      • 代码
        db.create(tablename, columns, indexes=None, verbose=0)
      • params
        • tablename: 表名;
        • columns: 列内容;
        • indexes: 索引,sqlite暂不支持索引
        • verbose: 是否打印执行进度。
    • mysql
      • 代码
        db.create(tablename, columns, indexes=None, index_part=128, ismultiple_index=True, partition=None, verbose=0)
      • params
        • tablename: 表名;
        • columns: 列内容;
        • indexes: 索引
        • index_part: 索引part
        • ismultiple_index: 多重索引
        • partition: 分区
        • verbose: 是否打印执行进度。
    • trino
      • 代码
        db.create(tablename, columns, partition=None, verbose=0)
      • params
        • tablename: 表名;
        • columns: 列内容;
        • partition: 分区
        • verbose: 是否打印执行进度。
  • insert【db/base.py】
    • 代码
      db.insert(tablename, columns, inserttype='value', values=None, chunksize=1000, fromtable=None, condition=None)
    • params
      • tablename: 表名;
      • columns: 列内容;
      • inserttype: 插入数据类型,支持value、select
      • values: inserttype='value',插入的数值;
      • chunksize: inserttype='value', 每个批次插入的量级;
      • fromtable: inserttype='select',数据来源表;
      • condition: inserttype='select',数据来源条件;
  • drop【db/base.py】
    • 代码
      db.drop(tablename)
    • params
      • tablename: 表名;
  • delete【db/base.py】
    • 代码
      db.delete(tablename, condition)
    • params
      • tablename: 表名;
      • condition: 插入的数值;
  • get_columns
    • 代码
      db.get_columns(tablename)
    • params
      • tablename: 表名;
  • add_columns
    • 代码
      db.add_columns(tablename, columns)
    • params
      • tablename: 表名;
      • columns: 列内容;
  • get_filesqls【db/fileexec.py】
    • 代码
      db.get_filesqls(filepath, **kw)
    • params
      • filepath: sql文件路径;
      • kw: sql文件中需要替换的参数,会替换sqlfile中的arguments;
  • file_exec【db/fileexec.py】
    • 代码
      db.file_exec(filepath, ehandling=None, verbose=0, **kw)
    • params
      • filepath: sql文件路径; 文件名以test开始或者结尾会打印sql执行的步骤;
      • ehandling: sql执行出错的时候处理方式, default: None
      • verbose: 执行的进度展示方式(0:不打印, 1:文字进度, 2:进度条)
      • kw: sql文件中需要替换的参数 在sql文件中用$param, 会替换sqlfile中的arguments;
    • sql文件格式(在desc中增加verbose会打印sql执行的步骤;)
      #arguments#
      ts = '2020-06-28'
      date = today
      date_max = date + timedelta(days=10)
      #arguments#
      ###
      --【desc1 [verbose]】 #sql描述
      --step1
      sql1;
      --step2
      sql2 where name = $name;
      ###
      ###
      --【desc2 [verbose]】 #sql描述
      --step1
      sql1;
      --step2
      sql2;
      ###
      
    • arguments
      • 支持python表达式(datetime、date、timedelta)
      • 支持全局变量和当前sqlfile设置过的变量
      • now:获取执行的时间
      • today: 获取执行的日期

魔法命令

  • 注册方法
    命令行中执行pydbapimagic

  • 参数

    • 帮助
      %dbconfig
    • 配置
      %dbconfig DBTYPE = 'mysql'
      %dbconfig HOST = 'localhost'
      %dbconfig USER = 'longfengpili'
      %dbconfig PASSWORD = '123456abc'
      %dbconfig DATABASE = 'test'
      %dbconfig PORT = 3306
      
    • 查看
      %dbconfig DBTYPE

支持的的settings【conf/settings.py】

  • AUTO_RULES
    可以自动执行表名(表名包含即可)

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