We will provide a smooth upgrade plan, as follows(It is not implemented, but will be done soon)
For the old mysql external table, I think we can ensure compatibility after the upgrade through metadata conversion 1. Users can install Mysql driver in advance before upgrading. 2. Metadata can be modified during replay, converting MySQLTable to OdbcTable 3. We can add a FE configuration to add the default driver attribute to the converted OdbcTable. -- 此致！Best Regards 陈明雨 Mingyu Chen Email: chenmin...@apache.org At 2020-08-18 11:58:51, "41108453" <41108...@qq.com> wrote: >This will cause users who currently use doris to be unable to smoothly upgrade >to the new version, especially those who use the WITH_MYSQL syntax >Can this syntax be retained and extended to support other databases such as >WITH_ORACLE, WITH_POSTGRESQL, etc.? > > > > > >------------------ Original ------------------ >From: > "dev" > ><happen...@hotmail.com>; >Date: Mon, Aug 17, 2020 04:00 PM >To: "dev@doris.apache.org"<dev@doris.apache.org>; > >Subject: [Proposal] Support ODBC Scan Node for Doris > > > > >Motivation > >At present, many customers need to access the external table through Doris, >but Doris only supports accessing the external table of MySQL at present. This >problem makes it difficult for users of other databases to use Doris. > >Open Database Connectivity (ODBC) is a standard application programming >interface for accessing database management >systems:https://en.wikipedia.org/wiki/Open_Database_Connectivity > >So should we support ODBC Scan node as a general external table access method, >it is provided to users. user can use Driver Manager of ODBC to determine the >databases that need to be accessed. > >It can bring us the following benefits: > > 1. First, Doris can eazily support a variety of different >databases as external table, likes: Oracle, PostgreSQL, SQLServer. Not only >RDMS, ODBC also support some NoSQL database. likes: Redis, MongoDB. > > 1. ODBC help Doris have a unified development interface instead >of focusing on the connection implementation of different databases. > > 2. UNIX ODBC is a static library based on LGPL, which can avoid >the commercial risk of using different database client APIs > >How To Use > >It is very similar to the previous use of MySQL external table. The table >creation statement is as follows. > >CREATE EXTERNAL TABLE `baseall_oracle` ( > `k1` decimal(9, 3) NOT NULL COMMENT "", > `k2` char(10) NOT NULL COMMENT "", > `k3` datetime NOT NULL COMMENT "", > `k5` varchar(20) NOT NULL COMMENT "", > `k6` double NOT NULL COMMENT "" >) ENGINE=ODBC >PROPERTIES ( >"host" = "192.168.1.2", >"port" = "4234", >"user" = "happenlee", >"password" = "happenlee", >"database" = "happen", >"table" = "baseall", >"driver" = "Oracle 19 ODBC driver", >"type" = "oracle" >); > > >Noted that it needs to add some additional info： > > * type： To identify which database the table belongs to. >For different databases, there are some differences in ODBC connection and >query. > > * driver： To identify which odbc driver the table use. Use >should installed proper driver and config it in be/conf/odbcinst.ini like： > ># Example driver definitions > ># Driver from the postgresql-odbc package ># Setup from the unixODBC package >[PostgreSQL] >Description = ODBC for PostgreSQL >Driver = /usr/lib/psqlodbc.so >Setup = /usr/lib/libodbcpsqlS.so >Driver64 = /usr/lib64/psqlodbc.so >Setup64 = /usr/lib64/libodbcpsqlS.so >FileUsage = 1 > > ># Driver from the mysql-connector-odbc package ># Setup from the unixODBC package >[MySQL ODBC 8.0 Unicode Driver] >Description = ODBC for MySQL >Driver = >/home/happen/mysql/mysql_odbc_rpm/usr/lib64/libmyodbc8w.so >FileUsage = 1 > >[Oracle 19 ODBC driver] >Description=Oracle ODBC driver for Oracle 19 >Driver=/usr/lib/oracle/19.8/client64/lib/libsqora.so.19.1 >Setup= >FileUsage= >CPTimeout= >CPReuse= > > > >Implementation > > 1. First, we should add third party static library of Unix ODBC. > > 2. Second，Modify thrift file to determine the interface of ODBC >scan node. like： > > 1. Modify the code of be part, implementation ODBC_SCAN_NODE and >ODBC_SCANNER > > 2. Modify the code of FE part to support adding external tables >of ODBC engine. > >Some Problem Need To Talk > > 1. Now the odbc driver of mysql have a function library conflict >with mysql-server-mysql-5.7.18，which may cause core of BE. So we should >disable WITH_MYSQL compile options，when we need to use ODBC_SCAN_NODE to >connect mysql. > > 2. odbc scan node should support old external table of MySQL. > > > Best Wish > > HappenLee
