利用选择控件设计查询界面实现复杂查询

软件技术国家教学资源库建设项目软件开发素材之C源代码一、名称利用选择控件设计查询界面实现复杂查询二、创建或搜集相关信息搜集单位重庆电子工程职业学院搜集时间20120805来源互联网三、适用对象学生、教师、C及ASPNET项目开发人员、相关技术人员等。四、功能简介设计查询界面，利用选择控件实现复杂查询。五、程序代码程序名称PROGRAMCSUSINGSYSTEMUSINGSYSTEMCOLLECTIONSGENERICUSINGSYSTEMLINQUSINGSYSTEMWINDOWSFORMSNAMESPACECHECKEDLISTBOXFORSELECTSTATICCLASSPROGRAM/应用程序的主入口点。/STATHREADSTATICVOIDMAINAPPLICATIONENABLEVISUALSTYLESAPPLICATIONSETCOMPATIBLETEXTRENDERINGDEFAULTFALSEAPPLICATIONRUNNEWMAINFORM程序名称MAINFORMCSUSINGSYSTEMUSINGSYSTEMCOLLECTIONSGENERICUSINGSYSTEMCOMPONENTMODELUSINGSYSTEMDATAUSINGSYSTEMDRAWINGUSINGSYSTEMTEXTUSINGSYSTEMWINDOWSFORMSUSINGSYSTEMDATAOLEDBNAMESPACECHECKEDLISTBOXFORSELECTPUBLICPARTIALCLASSMAINFORMFORMPUBLICMAINFORMINITIALIZECOMPONENTPUBLICVOIDGETSCOURESTRINGSTRSQLSTRINGCONNECTIONSTRINGFORMAT/定义数据库连接字符串“PROVIDERMICROSOFTJETOLEDB40DATASOURCETESTMDBUSERIDADMIN“OLEDBCONNECTIONP_CONNECTION/创建连接数据库对象NEWOLEDBCONNECTIONCONNECTIONP_CONNECTIONOPEN/打开数据库连接OLEDBCOMMANDP_COMMAND/创建数据库命令对象NEWOLEDBCOMMANDSTRSQL,P_CONNECTIONDATAGRIDVIEW1ROWSCLEAR/清空DATAGRIDVIEW中的数据OLEDBDATAREADERP_DATAREADER/得到数据读取器对象P_COMMANDEXECUTEREADERWHILEP_DATAREADERREAD/开始读取数据DATAGRIDVIEW1ROWSADDP_DATAREADER0TOSTRING,/向DATAGRIDVIEW中添加数据P_DATAREADER1TOSTRING,P_DATAREADER2TOSTRING,P_DATAREADER3TOSTRING,P_DATAREADER4TOSTRING,P_DATAREADER5TOSTRINGP_CONNECTIONCLOSE/关闭数据库连接PRIVATEVOIDBNTESCE_CLICKOBJECTSENDER,EVENTARGSECKCLASSCHECKEDFALSE/取消选中控件CKNAMECHECKEDFALSE/取消选中控件CKIDCHECKEDFALSE/取消选中控件RDBMANCHECKEDFALSE/取消选中控件RDBWOMANCHECKEDFALSE/取消选中控件PRIVATEVOIDCKID_CHECKEDCHANGEDOBJECTSENDER,EVENTARGSEIFCKIDCHECKEDTRUE/判断是否输入学号信息TXTSTUIDENABLEDTRUE/允许输入学号信息TXTSTUIDFOCUS/得到焦点ELSETXTSTUIDTEXT“/清空学号信息TXTSTUIDENABLEDFALSE/不允许输入学号信息PRIVATEVOIDCKCLASS_CHECKEDCHANGEDOBJECTSENDER,EVENTARGSEIFCKCLASSCHECKEDTRUE/判断是否输入班级信息TXTCLASSENABLEDTRUE/允许输入班级信息TXTCLASSFOCUS/得到焦点ELSETXTCLASSTEXT“/清空学号信息TXTCLASSENABLEDFALSE/不允许输入班级信息PRIVATEVOIDCKNAME_CHECKEDCHANGEDOBJECTSENDER,EVENTARGSEIFCKNAMECHECKEDTRUE/判断是否输入姓名信息TXTNAMEENABLEDTRUE/允许输入姓名信息TXTNAMEFOCUS/得到焦点ELSETXTNAMETEXT“/清空姓名信息TXTNAMEENABLEDFALSE/不允许输入姓名信息/PUBLICSTRINGSTRSQL/用于存储SQL语句PUBLICSTRINGSTRID/用于存学生编号PUBLICSTRINGSTRNAME/用于存储学生姓名PUBLICSTRINGSTRCLASS/用于存储学生班级PUBLICSTRINGSTRSEX/用于存储学生姓别PUBLICSTATICINTINTCOUNT0/控制数据组索引PUBLICSTRINGSTRSCOURENEWSTRING4/定义查询字符串数组PUBLICINTINTADD/用来判断SQL语句数组数量PRIVATEVOIDBNTSEARCH_CLICKOBJECTSENDER,EVENTARGSEINTCOUNT0IFTXTSTUIDTEXT“/判断输入编号是否为空STRID“学生编号LIKE“/定义SQL字符串TXTSTUIDTEXT“STRSCOUREINTCOUNTSTRID/向字符串集合添加SQL字符串INTCOUNT/开始记数IFTXTNAMETEXT“STRNAME“学生姓名LIKE“/定义SQL字符串TXTNAMETEXT“STRSCOUREINTCOUNTSTRNAME/向字符串集合添加SQL字符串INTCOUNT/开始记数IFTXTCLASSTEXT“STRCLASS“所在年级LIKE“/定义SQL字符串TXTCLASSTEXT“STRSCOUREINTCOUNTSTRCLASS/向字符串集合添加SQL字符串INTCOUNT/开始记数IFRDBMANCHECKEDTRUESTRSEX“学生性别LIKE“/定义SQL字符串RDBMANTEXT“STRSCOUREINTCOUNTSTRSEX/向字符串集合添加SQL字符串INTCOUNT/开始记数IFRDBWOMANCHECKEDTRUESTRSEX“学生性别LIKE“/定义SQL字符串RDBWOMANTEXT“STRSCOUREINTCOUNTSTRSEX/向字符串集合添加SQL字符串INTCOUNT/开始记数FORINTI0ISTRSCOURELENGTHI/遍历字符串集合IFSTRSCOUREINULL/判断字符是否为空STRSQLSTRSCOUREI/组合查询字符串INTADD/开始记数SWITCHINTADD/使用多路选择语句组合查询语句CASE0STRSQL“SELECTFROMTB_STUDENT“BREAKCASE1STRSQL“SELECTFROMTB_STUDENTWHERE“STRSCOURE0BREAKCASE2STRSQL“SELECTFROMTB_STUDENTWHERE“STRSCOURE0“AND“STRSCOURE1BREAKCASE3STRSQL“SELECTFROMTB_STUDENTWHERE“STRSCOURE0“AND“STRSCOURE1“AND“STRSCOURE2BREAKCASE4STRSQL“SELECTFROMTB_STUDENTWHERE“STRSCOURE0“AND“STRSCOURE1“AND“STRSCOURE2