FMDB 加入数据库版本信息

    //创建数据库版本表
    if (![db tableExists:@"tb_dbInfo"]) {
        result = [db executeUpdate:@"CREATE TABLE tb_dbInfo(version TEXT)"];
            }
    #pragma mark 更新版本号
    + (BOOL)updateVersionInfoWithString:(NSString*)version
    {
        __block BOOL b = FALSE;
        DataBaseUtil *dbUnit =[DataBaseUtil unit];
        [dbUnit.queue inDatabase:^(FMDatabase *db) {
            [db open];
            b = [db executeUpdate:@"UPDATE tb_dbInfo SET version = ?",version];
            [db close];
        }];
        return b;
    }  

    #pragma mark 插入版本号
    + (BOOL)insertVersionInfoWithString:(NSString*)version
    {
        __block BOOL b = FALSE;
        DataBaseUtil *dbUnit =[DataBaseUtil unit];
        [dbUnit.queue inDatabase:^(FMDatabase *db) {
            [db open];
            b = [db executeUpdate:@"INSERT INTO tb_dbInfo(version)VALUES(?)",version];
            [db close];
        }];
        return b;
    }
    #pragma mark 得到版本信息
    + (NSString*)getDBInfoValue
    {
        __block NSString * version = nil;
        DataBaseUtil *dbUnit =[DataBaseUtil unit];
        [dbUnit.queue inDatabase:^(FMDatabase *db) {
            [db open];
            FMResultSet* set =[db executeQuery:@"selectversion from tb_dbInfo"];
            if (set) {
                while ([set next]) {
                    version = [set stringForColumn:@"version"];
                }
            }
            [db close];
        }];
        return version;
    }
    #pragma mark 创建版本信息
    + (BOOL)setDBInfoValueWithString:(NSString*)string
    {
        BOOL result = FALSE;
        if ([self getDBInfoValue]) {
            //更新版本
            result = [self updateVersionInfoWithString:string];
        }
        else
        {
            //插入版本
            result =[self insertVersionInfoWithString:string];
        }
        return result;
    }