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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0">I changed the test to use <tt>update</tt> instead of <tt>create-drop</tt> and this is the log that it generates:</p>
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<pre style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-all; white-space: pre-wrap">09:08:16,138 DEBUG SQL:92 -
create table CUSTOMER (
CUSTOMER_ACCOUNT_NUMBER bigint not null,
BILLING_ADDRESS varchar(255),
CUSTOMER_ID varchar(255),
primary key (CUSTOMER_ACCOUNT_NUMBER)
) ENGINE=InnoDB
09:08:16,316 DEBUG SQL:92 -
create table hibernate_sequence (
next_val bigint
) ENGINE=InnoDB
09:08:16,414 DEBUG SQL:92 -
insert into hibernate_sequence values ( 1 )
09:08:16,417 TRACE UniqueConstraintSchemaUpdateStrategy:50 - Interpreting UniqueConstraintSchemaUpdateStrategy from setting : null
09:08:16,418 DEBUG SQL:92 -
alter table CUSTOMER
drop constraint UK_8eumjccoobf7t6psn9exu4gnh
09:08:16,424 DEBUG SQL:92 -
alter table CUSTOMER
add constraint UK_8eumjccoobf7t6psn9exu4gnh unique (CUSTOMER_ID)
09:08:16,572 INFO CustomRunner:123 - Test: testUniqueConstraintWithEmptyColumnName
Tue Jan 10 09:08:16 EET 2017 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
</pre>
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</div> <p style="margin: 10px 0 0">As you can see, the <tt>ALTER TABLE DROP CONSTRAINT</tt> works just fine. I'm using MySQL 5.7 as well.</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
alter table CUSTOMER
drop constraint UK_8eumjccoobf7t6psn9exu4gnh
</pre>
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