iphoe create a database, delete data, modify data, find data function

sql.xcodeproj
.............\project.pbxproj
__MACOSX
........\sql.xcodeproj
........\.............\._project.pbxproj
sql.xcodeproj\project.xcworkspace
.............\...................\contents.xcworkspacedata
__MACOSX\sql.xcodeproj\project.xcworkspace
........\.............\...................\._contents.xcworkspacedata
sql.xcodeproj\project.xcworkspace\xcuserdata
.............\...................\..........\qianfeng.xcuserdatad
.............\...................\..........\....................\UserInterfaceState.xcuserstate
__MACOSX\sql.xcodeproj\project.xcworkspace\xcuserdata
........\.............\...................\..........\qianfeng.xcuserdatad
........\.............\...................\..........\....................\._UserInterfaceState.xcuserstate
........\.............\...................\..........\._qianfeng.xcuserdatad
........\.............\...................\._xcuserdata
........\.............\._project.xcworkspace
sql.xcodeproj\xcuserdata
.............\..........\qianfeng.xcuserdatad
.............\..........\....................\xcdebugger
.............\..........\....................\..........\Breakpoints.xcbkptlist
__MACOSX\sql.xcodeproj\xcuserdata
........\.............\..........\qianfeng.xcuserdatad
........\.............\..........\....................\xcdebugger
........\.............\..........\....................\..........\._Breakpoints.xcbkptlist
........\.............\..........\....................\._xcdebugger
sql.xcodeproj\xcuserdata\qianfeng.xcuserdatad\xcschemes
.............\..........\....................\.........\sql.xcscheme
__MACOSX\sql.xcodeproj\xcuserdata\qianfeng.xcuserdatad\xcschemes
........\.............\..........\....................\.........\._sql.xcscheme
sql.xcodeproj\xcuserdata\qianfeng.xcuserdatad\xcschemes\xcschememanagement.plist
__MACOSX\sql.xcodeproj\xcuserdata\qianfeng.xcuserdatad\xcschemes\._xcschememanagement.plist
........\.............\..........\....................\._xcschemes
........\.............\..........\._qianfeng.xcuserdatad
........\.............\._xcuserdata

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