ËѼ¯µÄһЩLINQ to SQLµÄ×ÊÁÏ
MSDN: http://msdn.microsoft.com/en-us/library/bb386976.aspx £¨Ó¢ÎÄ£©
http://msdn.microsoft.com/zh-cn/library/bb386976.aspx £¨ÖÐÎÄ£©
ScottGu µÄLINQ ϵÁУº
Part 1: Introduction to LINQ to SQL
Part 2: Defining our Data Model Classes
Part 3: Querying our Database
Part 4: Updating our Database
Part 5: Binding UI using the ASP:LinqDataSource Control
Part 6: Retrieving Data Using Stored Procedures
Part 7: Updating our Database using Stored Procedures
Part 8: Executing Custom SQL Expressions
Part 9 - Using a Custom LINQ Expression with the <asp:LinqDatasource> control
Ïà¹ØÎĵµ£º
ÏÂÁÐÓï¾ä²¿·ÖÊÇMssqlÓï¾ä£¬²»¿ÉÒÔÔÚaccessÖÐʹÓá£
SQL·ÖÀࣺ
DDL—Êý¾Ý¶¨ÒåÓïÑÔ(CREATE£¬ALTER£¬DROP£¬DECLARE)
DML—Êý¾Ý²Ù×ÝÓïÑÔ(SELECT£¬DELETE£¬UPDATE£¬INSERT)
DCL—Êý¾Ý¿ØÖÆÓïÑÔ(GRANT£¬REVOKE£¬COMMIT£¬ROLLBACK)
Ê×ÏÈ,¼òÒª½éÉÜ»ù´¡Óï¾ä£º
1¡¢ËµÃ÷£º´´½¨Êý¾Ý¿â
CREATE DATABASE da ......
¡¾×ª¡¿Ò»Ð©³£ÓõÄsqlÓï¾ä×Ö·û´®´¦Àí£¬×ªÓÚÕâÀÒÔ·½±ãʹÓÃ
Ò»¡¢×Ö·ûת»»º¯Êý
1¡¢ASCII()
·µ»Ø×Ö·û±í´ïʽ×î×ó¶Ë×Ö·ûµÄASCII ÂëÖµ¡£ÔÚASCII£¨£©º¯ÊýÖУ¬´¿Êý×ÖµÄ×Ö·û´®¿É²»ÓÑ’À¨ÆðÀ´£¬µ«º¬ÆäËü×Ö·ûµÄ×Ö·û´®±ØÐëÓÑ’À¨ÆðÀ´Ê¹Ó㬷ñÔò»á³ö´í¡£
2¡¢CHAR()
½«ASCII Âëת»»Îª×Ö·û¡£Èç¹ûûÓÐÊäÈë0 ~ ......
1.×Ö·û´®º¯Êý
³¤¶ÈÓë·ÖÎöÓÃ
datalength(Char_expr) ·µ»Ø×Ö·û´®°üº¬×Ö·ûÊý,µ«²»°üº¬ºóÃæµÄ¿Õ¸ñ
substring(expression,start,length) ²»¶à˵ÁË,È¡×Ó´®
right(char_expr,int_expr) ·µ»Ø×Ö·û´®ÓÒ±ßint_expr¸ö×Ö·û
×Ö·û²Ù×÷Àà
upper(char_expr) תΪ´óд
lower(char_expr) תΪСд
space(int_expr) Éú³Éint_exp ......
ÔÚSQL½á¹¹»¯²éѯÓïÑÔÖУ¬LIKEÓï¾äÓÐ×ÅÖÁ¹ØÖØÒªµÄ×÷Óá£
¡¡¡¡LIKEÓï¾äµÄÓï·¨¸ñʽÊÇ£ºselect * from ±íÃû where ×Ö¶ÎÃû like ¶ÔÓ¦Öµ£¨×Ó´®£©£¬ËüÖ÷ÒªÊÇÕë¶Ô×Ö·ûÐÍ×ֶεģ¬ËüµÄ×÷ÓÃÊÇÔÚÒ»¸ö×Ö·ûÐÍ×Ö¶ÎÁÐÖмìË÷°üº¬¶ÔÓ¦×Ó´®µÄ¡£
¡¡¡¡¼ÙÉèÓÐÒ»¸öÊý¾Ý¿âÖÐÓиö±ítable1£¬ÔÚtable1ÖÐÓÐÁ½¸ö×ֶΣ¬·Ö±ðÊÇnameºÍsex¶þÕßÈ«ÊÇ×Ö·ûÐÍÊý¾ ......
QL·ÖÀࣺ
DDL—Êý¾Ý¶¨ÒåÓïÑÔ(CREATE£¬ALTER£¬DROP£¬DECLARE)
DML—Êý¾Ý²Ù×ÝÓïÑÔ(SELECT£¬DELETE£¬UPDATE£¬INSERT)
DCL—Êý¾Ý¿ØÖÆÓïÑÔ(GRANT£¬REVOKE£¬COMMIT£¬ROLLBACK)
Ê×ÏÈ,¼òÒª½éÉÜ»ù´¡Óï¾ä£º
1¡¢ËµÃ÷£º´´½¨Êý¾Ý¿â
CREATE DATABASE database-name
2¡¢ËµÃ÷£ºÉ¾³ýÊý¾Ý¿â
drop database dbname
3¡¢ ......