Question

On MySQL 5.1 with a database collation of latin1_general_ci, I get this Exception when I UPDATE:

Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Illegal mix of collations (latin1_general_ci,IMPLICIT) and (latin1_swedish_ci,IMPLICIT) for operation '='
Error Code: 1267
Call: UPDATE medicaltestdetails, TL_medicaltestdetails SET medicaltestdetails.Status = TL_medicaltestdetails.Status WHERE medicaltestdetails.TestDate = TL_medicaltestdetails.TestDate AND medicaltestdetails.TestSerial = TL_medicaltestdetails.TestSerial AND medicaltestdetails.ConsultantId = TL_medicaltestdetails.ConsultantId AND medicaltestdetails.TestTime = TL_medicaltestdetails.TestTime
Query: UpdateAllQuery(referenceClass=Medicaltestdetails sql="CREATE TEMPORARY TABLE IF NOT EXISTS TL_medicaltestdetails (Chg BIGINT, Remarks VARCHAR(255), Result VARCHAR(255), Status VARCHAR(255), TestDesc VARCHAR(255), TestType VARCHAR(255), TestDate DATE NOT NULL, TestSerial VARCHAR(255) NOT NULL, ConsultantId VARCHAR(255) NOT NULL, TestTime INTEGER NOT NULL, PRIMARY KEY (TestDate, TestSerial, ConsultantId, TestTime))")

Please help me to resolve this problem.

Answer 1

You probably had add ‘&characterEncoding=UTF-8’ onto my JDBC connect string.
if

mysql> show variables like "collation_database";
    +--------------------+-----------------+
    | Variable_name      | Value           |
    +--------------------+-----------------+
    | collation_database | utf8_general_ci |
    +--------------------+-----------------+

it is not like that
and

mysql> show table status;
    +--------------+-----------------+
    | Name         | Collation       |
    +--------------+-----------------+
    | my_view      | NULL            |
    | my_table     | utf8_unicode_ci |
    ...

it is not like that

do:

ALTER DATABASE mydb DEFAULT COLLATE utf8_unicode_ci;

and change the encoding for the field:

ALTER TABLE my_table MODIFY COLUMN my_column column_type CHARACTER SET utf8 COLLATE utf8_unicode_ci [NOT NULL];

or change the encoding of the table:

ALTER TABLE my_table CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci

Ciao

Luca