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ABAP数据库操作

1、abap语言使用的数据库语言:open sql ,Native sql(特定数据库自身sql) 2、使用OPen SQL注意的原则: a、尽可能减少满足条件的数据条目数量。 b、减少数据的传输量,以减少网络流量。 c、减少访问的数据库表量。 d、减少查询难度,可以通过整理选择标准来实现。 e、减少数据库负载。 3、使用Native sql有两个前提: a、知道使用数据库的类型。 b、了解该数据库的SQL语法。 4、ABAP的数据定义由数据字典创建。 5、提取数据方式:内表,工作区,变量。 6、select语句: select <result> from <source> into <target> where <condition> [group by <field>] [having <cond>][order by <field>]. 7、选择单行全部数据: select single * from spfli into wa_spfli where cityform='singapore' and into cityto='beijing'. 8、选择单行指定字段: select single carrid connid from spfli into (wa_carrid,wa_connid) where cityform='singapore' and into cityto='beijing'. 9、选择相关字段: select single carrid connid *from spfli into corresponding fields of wa_spfli where cityform='singapore' and into cityto='beijing'. 10、循环选择: select * from spfli into wa_spfli. write:/ wa_spfli-carrid,wa_spfli-connid. endselect. 11、选择至内表: select * from spfli into table ta_spfli. 读取时: loop at ta_spfli. write:/ta_spfli-carrid ta_spfli-connid. end loop. 12、指定查询条件 比较运算符:= < > <> <= >= 范围限定运算符: [not] between 字符比较运算符:[not] like '_'替代单个字符,'%'任意字符 忽略符号: select....where func like 'EDIT#_%' escape '#'. escape是指忽略'#'。 检查值列表: select .....where city in ('Berlin','Rome','London').指定城市'Berlin','Rome','London'。 检查空值:where ...f is [not] null..... 检查选择表:where ...f [not] in seltab.... seltab是选择标准表,是具有特定格式的内表,可以 通过select-options语句添加到程序和报表选择屏幕,并由报表用户填充,在可以在程序中创建(如使用 range语句) 13、动态指定查询条件: report Z_test. data:cond(72) type c, itab like table of cond, city1(10) value 'BEIJING', city1(10) value 'SINGAPORE', itab_spfli like talbe of spfli with header line... concatenate 'cityfrom = '''city1'''' into cond. append cond to itab. concatenate 'cityfto' ='''city2'''' into cond. append cond to itab. select * into table itab_spfli from spfli where (itab). 14、多表结合查询(嵌套,效率较低): reprot z_test. data: wa_carrid type spfli-carrid, wa_connid type spfli-connid, wa_carrname type scarr-carrname. select carrid connid from spfl

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    flask中的所有第三方模块大集合

    Flask-AppBuilder - Simple and rapid Application builder, includes detailed security, auto form generation, google charts and much more. FlaskEx - UNKNOWN gourd - easy server framework. add flask's style route to tcp/udp server. kit - Flask, Celery, SQLAlchemy integration framework. Flask-WTF - Simple integration of Flask and WTForms alchemist - A server architecture built on top of a solid foundation provided by flask, sqlalchemy, and various extensions. Flask-Mail - Flask extension for sending email sga - make it easier to use pyga for web develop. and make pyga compatible with flask and django. flask-peewee - Peewee integration for flask flask_util_js - flask's util in javascript. such as url_for etc. Flask-Security - Simple security for Flask apps Flask-RESTful - Simple framework for creating REST APIs Flask-SeaSurf - An updated CSRF extension for Flask. Flask-Cache - Adds cache support to your Flask application Flask-Admin - Simple and extensible admin interface framework for Flask Flask-Slither - A small library between MongoDB and JSON API endpoints Flask-Bootstrap - An extension that includes Bootstrap in your project, without any boilerplate code. Flask-Script - Scripting support for Flask Flask-GoogleLogin - Extends Flask-Login to use Google's OAuth2 authorization Flask-Exceptional - Adds Exceptional support to Flask applications Flask - A microframework based on Werkzeug, Jinja2 and good intentions INSTALLED: 0.10.1 (latest) clay-flask - Clay is a framework for building RESTful backend services using best practices. Flask-Classy - Class based views for Flask ShelfCMS - Enhancing flask microframework with beautiful admin and cms-like features

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    【SAP ABAP系列】ABAP数据库操作

    1、abap语言使用的数据库语言:open sql ,Native sql(特定数据库自身sql) 2、使用OPen SQL注意的原则:     a、尽可能减少满足条件的数据条目数量。     b、减少数据的传输量,以减少网络流量。     c、减少访问的数据库表量。     d、减少查询难度,可以通过整理选择标准来实现。     e、减少数据库负载。 3、使用Native sql有两个前提:     a、知道使用数据库的类型。     b、了解该数据库的SQL语法。 4、ABAP的数据定义由数据字典创建。 5、提取数据方式:内表,工作区,变量。 6、select语句: select <result> from <source> into <target>        where <condition> [group by <field>]        [having <cond>][order by <field>]. 7、选择单行全部数据: select single * from spfli into wa_spfli where cityform='singapore' and into cityto='beijing'. 8、选择单行指定字段: select single carrid connid from spfli into (wa_carrid,wa_connid) where cityform='singapore' and into cityto='beijing'. 9、选择相关字段: select single carrid connid *from spfli into corresponding fields of wa_spfli where cityform='singapore' and into cityto='beijing'. 10、循环选择: select * from spfli into wa_spfli. write:/ wa_spfli-carrid,wa_spfli-connid. endselect. 11、选择至内表: select * from spfli into table  ta_spfli. 读取时: loop at ta_spfli. write:/ta_spfli-carrid ta_spfli-connid. end loop. 12、指定查询条件 比较运算符:= <  > <>  <=  >=   范围限定运算符: [not] between 字符比较运算符:[not] like   '_'替代单个字符,'%'任意字符 忽略符号: select....where func like 'EDIT#_%' escape '#'. escape是指忽略'#'。 检查值列表: select .....where city in ('Berlin','Rome','London').指定城市'Berlin','Rome','London'。 检查空值:where ...f  is [not] null..... 检查选择表:where ...f [not] in seltab....   seltab是选择标准表,是具有特定格式的内表,可以 通过select-options语句添加到程序和报表选择屏幕,并由报表用户填充,在可以在程序中创建(如使用 range语句) 13、动态指定查询条件: report Z_test. data:cond(72) type c, itab like table of cond, city1(10) value 'BEIJING', city1(10) value 'SINGAPORE', itab_spfli like talbe of spfli with header line... concatenate 'cityfrom = '''city1'''' into cond. append cond to itab. concatenate 'cityfto' ='''city2'''' into cond. append cond to itab. select * into table itab_spfli from spfli where (itab). 14、多表结合查询(嵌套,效率较低): reprot z_test. data: wa_carrid type spfli-carrid, wa_connid type spfli-connid, wa_carrname type scarr-carrname. select carrid connid from spfli into (wa_carrid,wa_connid) where cityform='singapore' and into cit

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