SQLite 或 FMDB 无法找到包含某些字符的行
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【中文标题】SQLite 或 FMDB 无法找到包含某些字符的行【英文标题】：SQLite or FMDB is not able to find rows with certain characters 【发布时间】：2014-12-03 19:57:58 【问题描述】：我遇到了一个问题，我试图将行插入到数据库中，前提是它们不存在。如果我插入某些字符，则 FMDB 或 SQLite 会出现问题并假设每一行都是新的：
我希望每个集合都插入第一条记录，然后更新它：
2014-12-03 14:50:32.554 Dapper[94814:1592610] SET 0
2014-12-03 14:50:32.554 Dapper[94814:1592610] Inserted a record for an item found in iTunes: KeyItemWith PI Π.M4A 1416284085
2014-12-03 14:50:32.555 Dapper[94814:1592610] Updated a record for an item found in iTunes: KeyItemWith PI Π.M4A 1416284085
2014-12-03 14:50:32.556 Dapper[94814:1592610] SET 1
2014-12-03 14:50:32.556 Dapper[94814:1592610] Inserted a record for an item found in iTunes: /Volumes/X5 TF1/Radwimps/New/08 Π.M4A 1416284085
2014-12-03 14:50:32.557 Dapper[94814:1592610] Updated a record for an item found in iTunes: /Volumes/X5 TF1/Radwimps/New/08 Π.M4A 1416284085
2014-12-03 14:50:32.558 Dapper[94814:1592610] SET 2
2014-12-03 14:50:32.571 Dapper[94814:1592610] Inserted a record for an item found in iTunes: /Volumes/X5 TF1/Radwimps/New/08 NEW.M4A 1416284085
2014-12-03 14:50:32.574 Dapper[94814:1592610] Updated a record for an item found in iTunes: /Volumes/X5 TF1/Radwimps/New/08 NEW.M4A 1416284085
但我得到了（注意设置 1、2 失败，设置 3 很好）：
2014-12-03 14:50:32.554 Dapper[94814:1592610] SET 0
2014-12-03 14:50:32.554 Dapper[94814:1592610] Inserted a record for an item found in iTunes: KeyItemWith PI Π.M4A 1416284085
2014-12-03 14:50:32.555 Dapper[94814:1592610] Inserted a record for an item found in iTunes: KeyItemWith PI Π.M4A 1416284085
2014-12-03 14:50:32.556 Dapper[94814:1592610] SET 1
2014-12-03 14:50:32.556 Dapper[94814:1592610] Inserted a record for an item found in iTunes: /Volumes/X5 TF1/Radwimps/New/08 Π.M4A 1416284085
2014-12-03 14:50:32.557 Dapper[94814:1592610] Inserted a record for an item found in iTunes: /Volumes/X5 TF1/Radwimps/New/08 Π.M4A 1416284085
2014-12-03 14:50:32.558 Dapper[94814:1592610] SET 2
2014-12-03 14:50:32.571 Dapper[94814:1592610] Inserted a record for an item found in iTunes: /Volumes/X5 TF1/Radwimps/New/08 NEW.M4A 1416284085
2014-12-03 14:50:32.574 Dapper[94814:1592610] Updated a record for an item found in iTunes: /Volumes/X5 TF1/Radwimps/New/08 NEW.M4A 1416284085
代码如下：
#import "AppDelegate.h"
#import "FMDB.h"
@implementation AppDelegate
FMDatabase *leftDB;
FMDatabase *rightDB;
-(void)deleteDB
NSFileManager *fileManager = [NSFileManager defaultManager];//create instance of NSFileManager
NSString *dapperDirectory=@"/Users/jeremylaurenson/Desktop/";
NSString *dapperDB=[dapperDirectory stringByAppendingPathComponent:@"dapperleft.sqlite"];
NSLog(@"Deleting database at %@",dapperDB);
[fileManager removeItemAtPath:dapperDB error:nil];
dapperDB=[dapperDirectory stringByAppendingPathComponent:@"dapperright.sqlite"];
NSLog(@"Deleting database at %@",dapperDB);
[fileManager removeItemAtPath:dapperDB error:nil];
[self openDB:1];
[self createTable:1];
[self closeDB:1];
-(void)openDB:(int)side
FMDatabase *db;
NSString *dapperDirectory=@"/Users/jeremylaurenson/Desktop/";
NSString *dapperDB;
if(side==1)dapperDB=[dapperDirectory stringByAppendingPathComponent:@"dapperleft.sqlite"];
if(side==2)dapperDB=[dapperDirectory stringByAppendingPathComponent:@"dapperright.sqlite"];
NSLog(@"Opening database at %@",dapperDB);
db = [FMDatabase databaseWithPath:dapperDB];
if (![db open])
NSLog(@"Could not open db.");
if(side==1)leftDB=db;
if(side==2)rightDB=db;
-(void)createTable:(int)side
FMDatabase *db;
if(side==1)db=leftDB;
if(side==2)db=rightDB;
[db executeUpdate:@"CREATE TABLE `items` ( `key` TEXT, `filepath` TEXT, `sourceFile` TEXT, `UUID` TEXT, `DAPsize` NUMERIC, `OSXsize` REAL, `DAPdate` NUMERIC, `OSXdate` NUMERIC, `MustUpdate` INTEGER, `MustDelete` INTEGER , `isOnDAP` INTEGER , `SandBoxBookMark` TEXT,`tombStone` INTEGER);"];
-(BOOL)zeroDatabase:(int)side
FMDatabase *db;
if(side==1)db=leftDB;
if(side==2)db=rightDB;
if(![db open])
NSLog(@"DB is closed. Can not zero out");
return FALSE;
NSLog(@"Clearing flags in the database");
[db executeUpdate:@"update `items` set MustDelete=0,MustUpdate=0,tombStone=1"];
if([db hadError])
NSLog(@"Database error");
return FALSE;
NSLog(@"Done clearing flags in the database");
return TRUE;
-(void)closeDB:(int)side
FMDatabase *db;
if(side==1)db=leftDB;
if(side==2)db=rightDB;
if(![db open])
[db close];
-(void)insertItemFromiTunes:(NSString *)dapPath withSource:(NSString *)sourcePath withSize:(NSNumber *)size withDate:(NSDate *)date withUUID:(NSString *)UUID withSide:(int)side withSandboxBookmark:(NSString *)bookmark
FMDatabase *db;
if(side==1)db=leftDB;
if(side==2)db=rightDB;
BOOL updateOperation=FALSE;
if(![db open])
NSLog(@"DB is closed. Can not insertitemfromOSX");
return;
NSNumber *convertedDate=[NSNumber numberWithDouble:[date timeIntervalSince1970]];
FMResultSet *results = [db executeQuery:@"select count(*) from `items` where lower(key) = lower(?)",dapPath,nil];
while([results next])
if([results unsignedLongLongIntForColumnIndex:0]>0)
updateOperation=TRUE;
[results close];
if(updateOperation)
NSLog(@"Updated a record for an item found in iTunes: %@ %@ ",dapPath,size);
[db executeUpdate:@"update `items` set OSXsize=?, OSXDate=?, UUID=?,sourceFile=?,tombStone=0,SandBoxBookMark=? where lower(key)=lower(?)",
size,convertedDate,UUID,sourcePath,bookmark,dapPath, nil];
else
NSLog(@"Inserted a record for an item found in iTunes: %@ %@ ",dapPath,size);
[db executeUpdate:@"insert into `items`(key,filepath, OSXsize, OSXdate,UUID,sourceFile,tombStone,SandBoxBookMark) values(?,?,?,?,?,?,0,?)",
[dapPath lowercaseString], dapPath, size,convertedDate,UUID,sourcePath,bookmark,nil];
- (void)applicationWillFinishLaunching:(NSNotification *)aNotification
// Offer to the move the Application if necessary.
// Note that if the user chooses to move the application,
// this call will never return. Therefore you can suppress
// any first run UI by putting it after this call.
- (void)applicationWillTerminate:(NSNotification *)aNotification
[self closeDB:1];
[self closeDB:2];
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
[self deleteDB];;
[self openDB:1];
NSLog(@"SET 0");
[self insertItemFromiTunes:@"KeyItemWith PI Π.M4A" withSource:@"Some Pie.m4a" withSize:[NSNumber numberWithInt:1416284085] withDate:[NSDate date] withUUID:nil withSide:1 withSandboxBookmark:@"PiePieIs PI"];
[self insertItemFromiTunes:@"KeyItemWith PI Π.M4A" withSource:@"Some Pie.m4a" withSize:[NSNumber numberWithInt:1416284085] withDate:[NSDate date] withUUID:nil withSide:1 withSandboxBookmark:@"PiePieIs PI"];
NSLog(@"SET 1");
[self insertItemFromiTunes:@"/Volumes/X5 TF1/Radwimps/New/08 Π.M4A" withSource:@"file:///Users/jeremylaurenson/Music/iTunes/iTunes%20Media/Music/RADWIMPS/%E7%B5%B6%E4%BD%93%E7%B5%B6%E5%91%BD/08%20%CF%80.m4a" withSize:[NSNumber numberWithInt:1416284085] withDate:[NSDate date] withUUID:nil withSide:1 withSandboxBookmark:@"file:///Users/jeremylaurenson/Music/iTunes/iTunes%20Media/Music/RADWIMPS/%E7%B5%B6%E4%BD%93%E7%B5%B6%E5%91%BD/08%20%CF%80.m4a"];
[self insertItemFromiTunes:@"/Volumes/X5 TF1/Radwimps/New/08 Π.M4A" withSource:@"file:///Users/jeremylaurenson/Music/iTunes/iTunes%20Media/Music/RADWIMPS/%E7%B5%B6%E4%BD%93%E7%B5%B6%E5%91%BD/08%20%CF%80.m4a" withSize:[NSNumber numberWithInt:1416284085] withDate:[NSDate date] withUUID:nil withSide:1 withSandboxBookmark:@"file:///Users/jeremylaurenson/Music/iTunes/iTunes%20Media/Music/RADWIMPS/%E7%B5%B6%E4%BD%93%E7%B5%B6%E5%91%BD/08%20%CF%80.m4a"];
NSLog(@"SET 2");
[self insertItemFromiTunes:@"/Volumes/X5 TF1/Radwimps/New/08 NEW.M4A" withSource:@"file:///Users/jeremylaurenson/Music/iTunes/iTunes%20Media/Music/RADWIMPS/%E7%B5%B6%E4%BD%93%E7%B5%B6%E5%91%BD/08%20%CF%80.m4a" withSize:[NSNumber numberWithInt:1416284085] withDate:[NSDate date] withUUID:nil withSide:1 withSandboxBookmark:@"file:///Users/jeremylaurenson/Music/iTunes/iTunes%20Media/Music/RADWIMPS/%E7%B5%B6%E4%BD%93%E7%B5%B6%E5%91%BD/08%20%CF%80.m4a"];
[self insertItemFromiTunes:@"/Volumes/X5 TF1/Radwimps/New/08 NEW.M4A" withSource:@"file:///Users/jeremylaurenson/Music/iTunes/iTunes%20Media/Music/RADWIMPS/%E7%B5%B6%E4%BD%93%E7%B5%B6%E5%91%BD/08%20%CF%80.m4a" withSize:[NSNumber numberWithInt:1416284085] withDate:[NSDate date] withUUID:nil withSide:1 withSandboxBookmark:@"file:///Users/jeremylaurenson/Music/iTunes/iTunes%20Media/Music/RADWIMPS/%E7%B5%B6%E4%BD%93%E7%B5%B6%E5%91%BD/08%20%CF%80.m4a"];
[self closeDB:1];
[[NSApplication sharedApplication] terminate:self];
【问题讨论】：
【参考方案1】：我将小写转换全部转换为可可，因此 SQL 没有执行 lower() 调用。修复了问题。
【讨论】：
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