Question

我对Liquibase有一个奇怪的问题（最新版本3.2.2）。

它没有检测到DATABASECHANGELOG已经存在，所以它试图创建它并失败。

Liquibase究竟如何找出该表是否存在？我从github那里查了一下代码，但是无法弄明白（我的Java技能不够强大，而且这个项目结构让我感到害怕......）。

我正在使用Vertica，我的数据库中有多个模式，我正在尝试部署一个名为“someschema”的特定模式。执行用户someser在someschema上有一个默认的搜索路径。

那么，让我们看看一些输出：

首先，我使用updateSQL运行：

$ java -jar liquibase.jar --driver com.vertica.jdbc.Driver --classpath /opt/vertica/java/lib/vertica-jdbc.jar --changeLogFile databaseChangeLog.json --url "jdbc:vertica://myverticahost.com:5433/insight" --username someuser --password mypwd updateSQL
-- *********************************************************************
-- Update Database Script
-- *********************************************************************
-- Change Log: databaseChangeLog.json
-- Ran at: 9/8/14 10:19 PM
-- Against: someuser@jdbc:vertica://myverticahost.com:5433/insight
-- Liquibase version: 3.2.2
-- *********************************************************************

-- Create Database Lock Table
CREATE TABLE DATABASECHANGELOGLOCK (ID INT NOT NULL, LOCKED BOOLEAN NOT NULL, LOCKGRANTED datetime, LOCKEDBY VARCHAR(255), CONSTRAINT PK_DATABASECHANGELOGLOCK PRIMARY KEY (ID));

-- Initialize Database Lock Table
DELETE FROM DATABASECHANGELOGLOCK;

INSERT INTO DATABASECHANGELOGLOCK (ID, LOCKED) VALUES (1, FALSE);

-- Lock Database
-- Create Database Change Log Table
CREATE TABLE DATABASECHANGELOG (ID VARCHAR(255) NOT NULL, AUTHOR VARCHAR(255) NOT NULL, FILENAME VARCHAR(255) NOT NULL, DATEEXECUTED datetime NOT NULL, ORDEREXECUTED INT NOT NULL, EXECTYPE VARCHAR(10) NOT NULL, MD5SUM VARCHAR(35), DESCRIPTION VARCHAR(255), COMMENTS VARCHAR(255), TAG VARCHAR(255), LIQUIBASE VARCHAR(20));

-- Changeset databaseChangeLog.json::1::eyaly
create table eyal_test (id varchar(20));

INSERT INTO DATABASECHANGELOG (ID, AUTHOR, FILENAME, DATEEXECUTED, ORDEREXECUTED, MD5SUM, DESCRIPTION, COMMENTS, EXECTYPE, LIQUIBASE) VALUES ('1', 'eyaly', 'databaseChangeLog.json', CURRENT_TIMESTAMP, 1, '7:dc0cc25bf42c4738799e73a22426a51a', 'sql', '', 'EXECUTED', '3.2.2');

然后使用普通更新：

$ java -jar liquibase.jar --driver com.vertica.jdbc.Driver --classpath /opt/vertica/java/lib/vertica-jdbc.jar --changeLogFile databaseChangeLog.json --url "jdbc:vertica://myverticahost.com:5433/insight" --username someuser --password mypwd update

如您所见，表和元数据表都已创建：

dbadmin=> select * from tables where table_Schema='someschema' and (table_name ilike 'databasechange%' or table_name = 'eyal_test');
  table_schema_id  | table_schema |     table_id      |      table_name       |     owner_id      | owner_name  | is_temp_table | is_system_table | is_flextable | system_table_creator | partition_expression |          create_time          | table_definition 
-------------------+--------------+-------------------+-----------------------+-------------------+-------------+---------------+-----------------+--------------+----------------------+----------------------+-------------------------------+------------------
 45035996273719012 | someschema   | 63050394834440938 | DATABASECHANGELOGLOCK | 45035996273750006 | someuser    | f             | f               | f            |                      |                      | 2014-09-08 15:20:12.147975-07 | 
 45035996273719012 | someschema   | 63050394834441092 | DATABASECHANGELOG     | 45035996273750006 | someuser    | f             | f               | f            |                      |                      | 2014-09-08 15:20:13.965053-07 | 
 45035996273719012 | someschema   | 63050394834441216 | eyal_test             | 45035996273750006 | someuser    | f             | f               | f            |                          |                      | 2014-09-08 15:20:14.304429-07 | 
(3 rows)
dbadmin=> select * from stage.databasechangelog;
 ID | AUTHOR |        FILENAME        |        DATEEXECUTED        | ORDEREXECUTED | EXECTYPE |               MD5SUM               | DESCRIPTION | COMMENTS | TAG | LIQUIBASE 
----+--------+------------------------+----------------------------+---------------+----------+------------------------------------+-------------+----------+-----+-----------
 1  | eyaly  | databaseChangeLog.json | 2014-09-08 15:20:14.327397 |             1 | EXECUTED | 7:dc0cc25bf42c4738799e73a22426a51a | sql         |          |     | 3.2.2
(1 row)
dbadmin=> select * from stage.databasechangeloglock;
 ID | LOCKED |       LOCKGRANTED       |                 LOCKEDBY                  
----+--------+-------------------------+-------------------------------------------
  1 | t      | 2014-09-08 22:20:12.626 | mymachine (fe80:0:0:0:2000:aff:fea4:69e%2)
(1 row)

但是当我再次跑步时，我得到一个错误，而不是没有动作：

$ java -jar liquibase.jar --driver com.vertica.jdbc.Driver --classpath /opt/vertica/java/lib/vertica-jdbc.jar --changeLogFile databaseChangeLog.json --url "jdbc:vertica://myverticahost.com:5433/insight" --username someuser --password mypwd update
Unexpected error running Liquibase: Error executing SQL CREATE TABLE DATABASECHANGELOGLOCK (ID INT NOT NULL, LOCKED BOOLEAN NOT NULL, LOCKGRANTED datetime, LOCKEDBY VARCHAR(255), CONSTRAINT PK_DATABASECHANGELOGLOCK PRIMARY KEY (ID)): [Vertica][VJDBC](4213) ROLLBACK: Object "DATABASECHANGELOGLOCK" already exists

Answer 1

有一个Liquibase Vertica扩展，增加了对Liquibase中Vertica的支持。见https://liquibase.jira.com/wiki/display/CONTRIB/Liquibase+Vertica+Extension

Liquibase尝试创建DATABASECHANGELOG虽然它存在（Vertica）

1 个答案: