我正在尝试将PostgreSQL（9.4）UUID数组绑定到每个UUID周围的包装类数组。请注意，这些包装器集成在整个应用程序中，因此不能选择它们。我正在使用jOOQ和它的maven插件（3.5.1）来生成PoJo，Record和Table类。
我遇到绑定问题的数据库模式的相关部分看起来像：
create table foo (
id uuid primary key,
ids uuid[] not null
);
然后我尝试使用forcedType元素转换类，但是它生成的类不会编译。放弃我只是将它们留给UUID生成，直到我遇到一些问题，其中数组值没有转换为uuid，而PostgreSQL认为数组是我查询中的文本数组[1]。
为了解决这个问题，我尝试添加Binding [2]和Converter [3]，其中转换器用我们的包装器包装UUID并且绑定添加将表达式转换为生成的SQL。如果我写一个流畅的查询[4]，但在插入Record [5]时无法正常工作，这样可以正常工作。当我逐块构建数组查询时，insert语句以'array.length - 1'参数化部分结束。我怀疑我需要覆盖#get类的#set和Binding方法，但我发现这方面的文档有点亮。
所以我的问题是，在使用或不使用UUID类的情况下，在jOOQ中绑定Binding数组的正确方法是什么？此外，是否可以在过程中将其转换为T数组？
public BazId getBazIdBySearchingFooIdsInReverse(
@NotNull final OtherId otherId,
@NotNull final SomethingId somethingId,
@NotNull final String barTypeName,
@NotNull final SomethingElseId somethingElseId) {
final Bar bar = BAR.as("bar");
final Foo foo = FOO.as("foo");
return db.select(BAZ.ID)
.from(BAZ)
.join(bar)
.on(BAZ.SOMETHING_ID.eq(bar.SOMETHING_ID))
.join(foo)
.on(bar.FOO_ID.eq(foo.ID))
.join("lateral unnest(foo.ids) with ordinality as x (id,ord)")
.on("x.id=foo.id")
.join(BAR_TYPE)
.on(bar.BAR_TYPE_ID.eq(BAR_TYPE.ID)
.and(BAR_TYPE.NAME.equalIgnoreCase(barTypeName)))
.where(BAZ.SOMETHING_ID.eq(somethingId))
.and(BAZ.SOMETHING_ELSE_ID.eq(somethingElseId))
.and(bar.OTHER_ID.eq(otherId))
.orderBy(DSL.field("x.ord").desc())
.limit(1)
.fetchOneInto(BazId.class); //Wraps a UUID
}
public class FooIdsBinding extends DefaultBinding<Object[], FooId[]> {
private static final long serialVersionUID = 0L;
private static final UUIDConverter converter = new UUIDConverter();
public FooIdsBinding() {
super(new FooIdsConverter());
}
@Override
public void sql(final BindingSQLContext<FooId[]> ctx) {
final RenderContext render = ctx.render();
render.sql("array[");
final UUID[] uuids = ctx.convert(converter).value();
for (int i = 0, last = uuids.length - 1; i <= last; ++i) {
render.visit(DSL.val(uuids[i])).sql("::uuid");
if (i != last) {
render.sql(',');
}
}
render.sql("]::uuid[]");
}
@Override
public void register(final BindingRegisterContext<FooId[]> ctx) throws SQLException {
ctx.statement().registerOutParameter(ctx.index(), Types.ARRAY);
}
static class BaseUUIDConverter {
public FooId[] from(final Object[] from) {
return from == null ? null : Arrays.stream(from)
.map(that -> new FooId((UUID)that))
.collect(Collectors.toList())
.toArray(new FooId[from.length]);
}
public UUID[] to(final FooId[] from) {
return from == null ? null : Arrays.stream(from)
.map(FooId::getUuid)
.collect(Collectors.toList())
.toArray(new UUID[from.length]);
}
public Class<FooId[]> toType() {
return FooId[].class;
}
}
private static class UUIDConverter extends BaseUUIDConverter implements Converter<UUID[], FooId[]> {
@Override
public FooId[] from(final UUID[] that) {
return super.from(that);
}
@Override
public Class<UUID[]> fromType() {
return UUID[].class;
}
}
}
Object[]才能生成Table编译public class FooIdConverter extends FooIdsBinding.BaseUUIDConverter implements Converter<Object[],FooId[]> {
private static final long serialVersionUID = 0L;
@Override
public Class<Object[]> fromType() {
return (Class)UUID[].class;
}
}
db.insertInto(FOO)
.set(FOO.ID, new FooId())
.set(FOO.IDS, new FooId[]{new FooId(),new FooId()})
.execute();
foo = new FooRecord();
foo.setId(new FooId());
foo.setIds(new FooId[]{new FooId(),new FooId()});
db.executeInsert(foo);
更新
我最终得到了绑定和转换器，它工作正常。我以为我需要将数组的每个元素转换为一个uuid，我的实现导致了jOOQ的sql生成问题，但我认为在我超越Binding#register之前我只看到了与jOOQ有关的错误ARRAY。
转换器
public class FooIdConverter implements Converter<Object[],FooId[]> {
private static final long serialVersionUID = 1L;
@Override
public FooId[] from(final Object[] from) {
return from == null ? null : Arrays.stream(from)
.map(that -> new FooId((UUID)that))
.collect(Collectors.toList())
.toArray(new FooId[from.length]);
}
@Override
public UUID[] to(final FooId[] from) {
return from == null ? null : Arrays.stream(from)
.map(FooId::getUuid)
.collect(Collectors.toList())
.toArray(new UUID[from.length]);
}
@Override
@SuppressWarnings("unchecked")
public Class<Object[]> fromType() {
return (Class)UUID[].class;
}
@Override
public Class<FooId[]> toType() {
return FooId[].class;
}
}
装订
public class FooIdBinding extends DefaultBinding<Object[], FooId[]> {
private static final long serialVersionUID = 1L;
public FooIdBinding() {
super(new FooIdConverter());
}
@Override
public void sql(final BindingSQLContext<FooId[]> ctx) {
super.sql(ctx);
ctx.render().sql("::uuid[]");
}
@Override
public void register(final BindingRegisterContext<FooId[]> ctx) throws SQLException {
ctx.statement().registerOutParameter(ctx.index(), Types.ARRAY);
}
@Override
public void get(final BindingGetResultSetContext<FooId[]> ctx) throws SQLException {
ctx.value(_convert(ctx.resultSet().getArray(ctx.index())));
}
@Override
public void get(final BindingGetStatementContext<FooId[]> ctx) throws SQLException {
ctx.value(_convert(ctx.statement().getArray(ctx.index())));
}
@Override
public void get(final BindingGetSQLInputContext<FooId[]> ctx) throws SQLException {
ctx.value(_convert(ctx.input().readArray()));
}
@Override
public void set(final BindingSetStatementContext<FooId[]> ctx) throws SQLException {
final PreparedStatement ps = ctx.statement();
ps.setArray(ctx.index(), ps.getConnection().createArrayOf("uuid", ctx.value()));
}
@Override
public void set(final BindingSetSQLOutputContext<FooId[]> ctx) throws SQLException {
throw new UnsupportedOperationException();
}
protected FooId[] _convert(final Array array) throws SQLException {
if (array == null) {
return null;
} else {
return converter().from(((UUID[]) array.getArray()));
}
}
}