Spring Data JPA：数据类型 varchar 和 varbinary 不兼容在使用 concat() 方法时发生 add 运算符异常

Question

在我的 Spring Data 项目中，我尝试对 JPA 查询注释使用 concat 操作（如下所示）

@Query("SELECT a from ApiEnrollmentsView a where (:mrn is null or a.mrn=:mrn) and " +
        " (:firstName is null  or a.firstName like concat(:firstName, '%')) and " +
        " (:lastName is null  or a.lastName like concat(:lastName, '%')) ")
List<ApiEnrollmentsView> findEnrollmentsByMrnAndFirstNameAndLastName(String mrn, String firstName, String lastName);

项目编译正常，但是当我访问该方法时，出现异常data types varchar and varbinary are incompatible in the add operator

例外：

Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: The data types varchar and varbinary are incompatible in the add operator.
    at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:262)
    at com.microsoft.sqlserver.jdbc.SQLServerStatement.getNextResult(SQLServerStatement.java:1632)
    at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.doExecutePreparedStatement(SQLServerPreparedStatement.java:600)
    at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement$PrepStmtExecCmd.doExecute(SQLServerPreparedStatement.java:522)
    at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:7225)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:3053)
    at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeCommand(SQLServerStatement.java:247)
    at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeStatement(SQLServerStatement.java:222)
    at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.executeQuery(SQLServerPreparedStatement.java:444)
    at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeQuery(ProxyPreparedStatement.java:52)
    at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeQuery(HikariProxyPreparedStatement.java)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:57)
    ... 174 more

Answer 1

我记得我有完全相同的奇怪错误。正如 cmets 中提到的，问题通过使用 coalesce 函数而不是 concat 来解决。