//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;

    }