学习FMDB数据库，引入FMDB之后报下面的错，是因为我没有导入libsqlite3.tbd
Undefined symbols for architecture armv7:
"_sqlite3_column_type", referenced from:
-[FMResultSet stringForColumnIndex:] in FMResultSet.o
-[FMResultSet dateForColumnIndex:] in FMResultSet.o
-[FMResultSet dataForColumnIndex:] in FMResultSet.o
-[FMResultSet dataNoCopyForColumnIndex:] in FMResultSet.o
-[FMResultSet columnIndexIsNull:] in FMResultSet.o
-[FMResultSet UTF8StringForColumnIndex:] in FMResultSet.o
-[FMResultSet objectForColumnIndex:] in FMResultSet.o
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