转自http://blog.devtang.com/blog/2012/04/22/use-fmdb/ 还不错。过后我会自己写的放出来 在iOS开发中使用FMDB

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NSString* docsdir = [NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString* dbpath = [docsdir stringByAppendingPathComponent:@"user.sqlite"];
FMDatabase* db = [FMDatabase databaseWithPath:dbpath];
[db open];
FMResultSet *rs = [db executeQuery:@"select * from people"];
while ([rs next]) {
NSLog(@"%@ %@",
[rs stringForColumn:@"firstname"],
[rs stringForColumn:@"lastname"]);
}
[db close];

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FMDatabase.h
FMDatabase.m
FMDatabaseAdditions.h
FMDatabaseAdditions.m
FMDatabasePool.h
FMDatabasePool.m
FMDatabaseQueue.h
FMDatabaseQueue.m
FMResultSet.h
FMResultSet.m

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FMDatabase *db = [FMDatabase databaseWithPath:@"/tmp/tmp.db"];

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if (![db open]) {
// error
return;
}
// some operation
// ...

[db close];

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-[FMDatabase executeUpdate:error:withArgumentsInArray:orVAList:]

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FMResultSet *s = [db executeQuery:@"SELECT * FROM myTable"];
while ([s next]) {
//retrieve values for each record
}

FMResultSet *s = [db executeQuery:@"SELECT COUNT(*) FROM myTable"];
if ([s next]) {
int totalCount = [s intForColumnIndex:0];
}

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intForColumn:
longForColumn:
longLongIntForColumn:
boolForColumn:
doubleForColumn:
stringForColumn:
dateForColumn:
dataForColumn:
dataNoCopyForColumn:
UTF8StringForColumnIndex:
objectForColumn:

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INSERT INTO myTable VALUES (?, ?, ?)

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NSString *sql = @"insert into User (name, password) values (?, ?)";
[db executeUpdate:sql, user.name, user.password];

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// 错误，42不能作为参数
[db executeUpdate:@"INSERT INTO myTable VALUES (?)", 42];
// 正确，将42封装成 NSNumber 类
[db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:42]];

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// 创建，最好放在一个单例的类中
FMDatabaseQueue *queue = [FMDatabaseQueue databaseQueueWithPath:aPath];

// 使用
[queue inDatabase:^(FMDatabase *db) {
[db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:1]];
[db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:2]];
[db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:3]];

FMResultSet *rs = [db executeQuery:@"select * from foo"];
while ([rs next]) {
// …
}
}];

// 如果要支持事务
[queue inTransaction:^(FMDatabase *db, BOOL *rollback) {
[db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:1]];
[db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:2]];
[db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:3]];

if (whoopsSomethingWrongHappened) {
*rollback = YES;
return;
}
// etc…
[db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:4]];
}];