我有一个带有2个列的联接表：
a_id, b_id
并且我正在从以下csv
a_id, b_id
1,1
1,2
1,3
2,2
2,3
我需要做的是，当将某些条目添加到csv中时，以更新联接表。
我尝试了以下changelod，但它抱怨ID重复：
<changeSet id="20180530172823-1" author="developer" runOnChange="true">
<loadUpdateData
primaryKey="a_id,b_id"
catalogName="cat"
encoding="UTF-8"
file="config/liquibase/a_b_join.csv"
schemaName="public"
separator=","
quotchar="'"
tableName="a_b">
</loadUpdateData>
</changeSet>
但它抱怨现有的ID：
detail: Key ( a_id, b_id)=( 1, 1) already exists.
where: SQL statement "INSERT INTO public. a_b ( a_id, b_id) VALUES (' 1', '1')"
PL/pgSQL function inline_code_block line 5 at SQL statement [Failed SQL: DO
$$
BEGIN
UPDATE public. a_b SET b_id = '1' WHERE a_id = ' 1' AND b_id is NULL;
IF not found THEN
INSERT INTO public. a_b ( a_id, b_id) VALUES (' 1', '1');
END IF;
END;
$$
LANGUAGE plpgsql;]
2018-10-23 00: 19:41.864 ERROR 28574 --- [neut-Executor-1] i.g.j.c.liquibase.AsyncSpringLiquibase : Liquibase could not start correctly, your database is NOT ready: Migration failed for change set config/liquibase/changelog/20180531103611_added_a_b_join_data.xml::20180531103611-1::developer:
Reason: liquibase.exception.DatabaseException: ERROR: duplicate key value violates unique constraint " a_b_pkey"
detail: Key ( a_id, b_id)=( 1, 1) already exists.
where: SQL statement "INSERT INTO public. a_b ( a_id, b_id) VALUES (' 1', '1')"
PL/pgSQL function inline_code_block line 5 at SQL statement [Failed SQL: DO
$$
BEGIN
UPDATE public. a_b SET b_id = '1' WHERE a_id = ' 1' AND b_id is NULL;
IF not found THEN
INSERT INTO public. a_b ( a_id, b_id) VALUES (' 1', '1');
END IF;
END;
$$
LANGUAGE plpgsql;]
liquibase.exception.MigrationFailedException: Migration failed for change set config/liquibase/changelog/20180531103611_added_a_b_join_data.xml::20180531103611-1::developer:
Reason: liquibase.exception.DatabaseException: ERROR: duplicate key value violates unique constraint " a_b_pkey"
detail: Key ( a_id, b_id)=( 1, 1) already exists.
where: SQL statement "INSERT INTO public. a_b ( a_id, b_id) VALUES (' 1', '1')"
PL/pgSQL function inline_code_block line 5 at SQL statement [Failed SQL: DO
$$
BEGIN
UPDATE public. a_b SET b_id = '1' WHERE a_id = ' 1' AND b_id is NULL;
IF not found THEN
INSERT INTO public. a_b ( a_id, b_id) VALUES (' 1', '1');
END IF;
END;
$$
LANGUAGE plpgsql;]
at liquibase.changelog.ChangeSet.execute(ChangeSet.java:6 1)
at liquibase.changelog.visitor.UpdateVisitor.visit(UpdateVisitor.java:51)
at liquibase.changelog.ChangeLogIterator.run(ChangeLogIterator.java:79)
at liquibase.Liquibase.update(Liquibase.java:214)
at liquibase.Liquibase.update(Liquibase.java: 12)
at liquibase.integration.spring.SpringLiquibase.performUpdate(SpringLiquibase.java:431)
at liquibase.integration.spring.SpringLiquibase.afterPropertiesSet(SpringLiquibase.java:388)
at io.github.jhipster.config.liquibase.AsyncSpringLiquibase.initDb(AsyncSpringLiquibase.java:94)
at io.github.jhipster.config.liquibase.AsyncSpringLiquibase.lambda$afterPropertiesSet$0(AsyncSpringLiquibase.java:77)
at io.github.jhipster.async.ExceptionHandlingAsyncTaskExecutor.lambda$createWrappedRunnable$1(ExceptionHandlingAsyncTaskExecutor.java:68)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: liquibase.exception.DatabaseException: ERROR: duplicate key value violates unique constraint " a_b_pkey"
detail: Key ( a_id, b_id)=( 1, 1) already exists.
where: SQL statement "INSERT INTO public. a_b ( a_id, b_id) VALUES (' 1', '1')"
PL/pgSQL function inline_code_block line 5 at SQL statement [Failed SQL: DO
$$
BEGIN
UPDATE public. a_b SET b_id = '1' WHERE a_id = ' 1' AND b_id is NULL;
IF not found THEN
INSERT INTO public. a_b ( a_id, b_id) VALUES (' 1', '1');
END IF;
END;
$$
LANGUAGE plpgsql;]
at liquibase.executor.jvm.JdbcExecutor$ExecuteStatementCallback.doInStatement(JdbcExecutor.java:309)
at liquibase.executor.jvm.JdbcExecutor.execute(JdbcExecutor.java:55)
at liquibase.executor.jvm.JdbcExecutor.execute(JdbcExecutor.java:113)
at liquibase.database.AbstractJdbcDatabase.execute(AbstractJdbcDatabase.java:1277)
at liquibase.database.AbstractJdbcDatabase.executeStatements(AbstractJdbcDatabase.java:1259)
at liquibase.changelog.ChangeSet.execute(ChangeSet.java:582)
... 12 common frames omitted
Caused by: org.postgresql.util.PSQLException: ERROR: duplicate key value violates unique constraint " a_b_pkey"
detail: Key ( a_id, b_id)=( 1, 1) already exists.
where: SQL statement "INSERT INTO public. a_b ( a_id, b_id) VALUES (' 1', '1')"
PL/pgSQL function inline_code_block line 5 at SQL statement
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2455)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2155)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:288)
at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:430)
at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:356)
at org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:303)
at org.postgresql.jdbc.PgStatement.executeCachedSql(PgStatement.java:289)
at org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:266)
at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:262)
at com.zaxxer.hikari.pool.ProxyStatement.execute(ProxyStatement.java:95)
at com.zaxxer.hikari.pool.HikariProxyStatement.execute(HikariProxyStatement.java)
at liquibase.executor.jvm.JdbcExecutor$ExecuteStatementCallback.doInStatement(JdbcExecutor.java:307)
... 17 common frames omitted
因此，现在，我首先删除现有值，然后使用以下更改日志从csv加载数据（甚至更改）：
<changeSet id="20180530172823-1" author="developer" runOnChange="true">
<delete catalogName="cat"
schemaName="public"
tableName="a_b">
<where>true</where>
</delete>
<loadData
catalogName="cat"
encoding="UTF-8"
file="config/liquibase/a_b_join.csv"
schemaName="public"
separator=","
quotchar="'"
tableName="a_b">
</loadUpdateData>
</changeSet>
它有效，但我想避免删除用户插入的可能条目。关于如何实现此目标的任何想法？