从 hibernate 6 中删除了 registerFunction

Question

我们正在从 springboot 2 迁移到 3，其中包括 hibernate 5 到 6 迁移

public class ExtendSqlServer2012Dialect extends SqlServer2012Dialect{
    public ExtendSqlServer2012Dialect(){
        registerFunction("datediffhr", new SQLFunctionemplate(StandardBasicTypes.INTEGER,"datediff(hour,?1,?2)"));
        registerFunction("dateaddhr", new SQLFunctionemplate(StandardBasicTypes.TIMESTAMP,"dateaddhr(hour,0,?1)"));
    }
}

Answer 1

Dialect

现在实现了

FunctionContributor

。直接等价的是：

public class ExtendSqlServer2012Dialect extends SqlServerDialect{
    @Override
    public void contributeFunctions(FunctionContributions functionContributions) {
        super.contributeFunctions(functionContributions);
        SqmFunctionRegistry registry = functionContributions.getFunctionRegistry();
        TypeConfiguration types = functionContributions.getTypeConfiguration();

        registry.register("datediffhr", new PatternBasedSqmFunctionDescriptor(
                new PatternRenderer("datediff(hour,?1,?2)"),
                StandardArgumentsValidators.exactly(2),
                StandardFunctionReturnTypeResolvers.invariant(
                        types.getBasicTypeForJavaType(integer.class)
                ),
                StandardFunctionArgumentTypeResolvers.invariant(
                        FunctionParameterType.TEMPORAL,
                        FunctionParameterType.TEMPORAL
                ),
                "datediffhr",
                FunctionKind.NORMAL,
                null
        ));
    }
}

您可能会发现

registry.registerNamed

更容易使用，或者您可能喜欢使用不同的

SqmFunctionDescriptor

子类。

您还可以使用通过 SPI 注册的独立

FunctionContributor

，而不是扩展

Dialect

。