下面就介绍一下它的用法：
1.首先我们需要创建一个FMDatabase实例：

+(FMDatabase*)DataBaseSigonInstance

{

//数据库初始化

NSString *homeDir =NSHomeDirectory();

//NSLog(@"%@",homeDir);

NSString *dbPath = [homeDirstringByAppendingPathComponent:@"Library/Caches/FMDatabaseDemo.db"];

FMDatabase *database = [FMDatabasedatabaseWithPath:dbPath];

return database;

}

//打开数据库

FMDatabase *db = [FMDataBasePathDataBaseSigonInstance];

if (!db.open)

{

NSLog(@"fail to open database");

return;

}

db.logsErrors =YES;//开启错误日志

[db executeUpdate:@"CREATE TABLE IF NOT EXISTS studentTable(name varchar,age integer,totalScore float)"];

[dbclose];

FMDatabase *db = [FMDataBasePathDataBaseSigonInstance];

if (!db.open)

{

NSLog(@"fail to open database");

return;

}

//获得数据

student.name = ((UITextField*)[alertViewviewWithTag:TEXTFIELD_TAG]).text;

student.age = [((UITextField*)[alertViewviewWithTag:TEXTFIELD_TAG + 1]).textintValue];

student.totalScore = [((UITextField*)[alertViewviewWithTag:TEXTFIELD_TAG + 2]).textfloatValue];

db.logsErrors =YES;

[db executeUpdate:@"insert into studentTable(name,age,totalScore)values(?,?,?)",student.name,[NSNumbernumberWithInt:student.age],[NSNumbernumberWithFloat:student.totalScore]];//注意参数必须是对象

[dbclose];

FMDatabase *db = [FMDataBasePathDataBaseSigonInstance];

if (!db.open)

{

NSLog(@"fail to open!");

return;

}

db.logsErrors =YES;

NSString *delDataSqlStr =@"delete from studentTable";

[dbexecuteUpdate:delDataSqlStr];

[dbclose];

FMDatabase *db = [FMDataBasePathDataBaseSigonInstance];

if (!db.open)

{

NSLog(@"fail to open!");

return;

}

db.logsErrors =YES;

[db executeUpdate:@"update studentTable set totalScore = 100"];

[dbclose];

FMDatabase *db = [FMDataBasePathDataBaseSigonInstance];

if (!db.open)

{

NSLog(@"fail to open!");

return;

}

db.logsErrors =YES;

FMResultSet *rs = [dbexecuteQuery:@"select * from studentTable"];

NSMutableArray *studentArr = [[NSMutableArrayalloc]init];

while ([rsnext])

{

NSMutableDictionary *dic = [[NSMutableDictionaryalloc]init];

[dic setValue:[rsstringForColumn:@"name"]forKey:@"name"];

[dic setValue:[NSNumbernumberWithInt:[rsintForColumn:@"age"]]forKey:@"age"];

[dic setValue:[NSNumbernumberWithDouble:[rsdoubleForColumn:@"totalScore"]]forKey:@"totalScore"];

[studentArraddObject:dic];

[dicrelease];

}

for (int count = 0; count< [studentArrcount]; count++)

{

NSLog(@"sudent:%@  age:%@  totalScore:%@",[[studentArrobjectAtIndex:count]objectForKey:@"name"],[[studentArrobjectAtIndex:count]objectForKey:@"age"],[[studentArrobjectAtIndex:count]objectForKey:@"totalScore"]);

}

[studentArrrelease];

[dbclose];

- (BOOL)executeUpdate:(NSString*)sql, ...;   这个是用于执行无结果的sql语句的

- (FMResultSet *)executeQuery:(NSString*)sql, ...;  这个是用于执行有结果的sql语句的

FMResultSet：

- (BOOL)next; 结果集的下一个

- (int)columnCount; 结果集的字段个数

- (int)intForColumn:(NSString*)columnName; 获取整形字段的信息（下面的都是同理）

- (int)intForColumnIndex:(int)columnIdx;

- (long)longForColumn:(NSString*)columnName;

- (long)longForColumnIndex:(int)columnIdx;

- (longlongint)longLongIntForColumn:(NSString*)columnName;

- (longlongint)longLongIntForColumnIndex:(int)columnIdx;

- (unsignedlonglong int)unsignedLongLongIntForColumn:(NSString*)columnName;

- (unsignedlonglong int)unsignedLongLongIntForColumnIndex:(int)columnIdx;

- (BOOL)boolForColumn:(NSString*)columnName;

- (BOOL)boolForColumnIndex:(int)columnIdx;

- (double)doubleForColumn:(NSString*)columnName;

- (double)doubleForColumnIndex:(int)columnIdx;

- (NSString*)stringForColumn:(NSString*)columnName;

- (NSString*)stringForColumnIndex:(int)columnIdx;

- (NSDate*)dateForColumn:(NSString*)columnName;

- (NSDate*)dateForColumnIndex:(int)columnIdx;

- (NSData*)dataForColumn:(NSString*)columnName; 获取二进制数据（图片可以使用这个）

- (NSData*)dataForColumnIndex:(int)columnIdx;