摘要：序設計了幾張表，這里簡單介紹下主要用來存儲對象的每次變更操作以及變更的屬性值。存儲了每次變更的存儲了每次變更的時間變更人支持自動從獲取也可以自定義，比如用來存儲額外的信息，比如存儲了用戶，順帶存一下用戶名等。

javers設計了幾張表，這里簡單介紹下

主要用來存儲對象的每次變更操作以及變更的屬性值。

-- ----------------------------
--  Table structure for jv_snapshot
-- ----------------------------
DROP TABLE IF EXISTS "public"."jv_snapshot";
CREATE TABLE "public"."jv_snapshot" (
    "snapshot_pk" int8 NOT NULL,
    "type" varchar(200) COLLATE "default",
    "version" int8,
    "state" text COLLATE "default",
    "changed_properties" text COLLATE "default",
    "managed_type" varchar(200) COLLATE "default",
    "global_id_fk" int8,
    "commit_fk" int8
)
WITH (OIDS=FALSE);
ALTER TABLE "public"."jv_snapshot" OWNER TO "postgres";

-- ----------------------------
--  Primary key structure for table jv_snapshot
-- ----------------------------
ALTER TABLE "public"."jv_snapshot" ADD PRIMARY KEY ("snapshot_pk") NOT DEFERRABLE INITIALLY IMMEDIATE;

-- ----------------------------
--  Indexes structure for table jv_snapshot
-- ----------------------------
CREATE INDEX  "jv_snapshot_commit_fk_idx" ON "public"."jv_snapshot" USING btree(commit_fk "pg_catalog"."int8_ops" ASC NULLS LAST);
CREATE INDEX  "jv_snapshot_global_id_fk_idx" ON "public"."jv_snapshot" USING btree(global_id_fk "pg_catalog"."int8_ops" ASC NULLS LAST);

-- ----------------------------
--  Foreign keys structure for table jv_snapshot
-- ----------------------------
ALTER TABLE "public"."jv_snapshot" ADD CONSTRAINT "jv_snapshot_commit_fk" FOREIGN KEY ("commit_fk") REFERENCES "public"."jv_commit" ("commit_pk") ON UPDATE NO ACTION ON DELETE NO ACTION NOT DEFERRABLE INITIALLY IMMEDIATE;
ALTER TABLE "public"."jv_snapshot" ADD CONSTRAINT "jv_snapshot_global_id_fk" FOREIGN KEY ("global_id_fk") REFERENCES "public"."jv_global_id" ("global_id_pk") ON UPDATE NO ACTION ON DELETE NO ACTION NOT DEFERRABLE INITIALLY IMMEDIATE;

存儲了每次變更的id

-- ----------------------------
--  Table structure for jv_global_id
-- ----------------------------
DROP TABLE IF EXISTS "public"."jv_global_id";
CREATE TABLE "public"."jv_global_id" (
    "global_id_pk" int8 NOT NULL,
    "local_id" varchar(200) COLLATE "default",
    "fragment" varchar(200) COLLATE "default",
    "type_name" varchar(200) COLLATE "default",
    "owner_id_fk" int8
)
WITH (OIDS=FALSE);
ALTER TABLE "public"."jv_global_id" OWNER TO "postgres";

-- ----------------------------
--  Primary key structure for table jv_global_id
-- ----------------------------
ALTER TABLE "public"."jv_global_id" ADD PRIMARY KEY ("global_id_pk") NOT DEFERRABLE INITIALLY IMMEDIATE;

-- ----------------------------
--  Indexes structure for table jv_global_id
-- ----------------------------
CREATE INDEX  "jv_global_id_local_id_idx" ON "public"."jv_global_id" USING btree(local_id COLLATE "default" "pg_catalog"."text_ops" ASC NULLS LAST);

-- ----------------------------
--  Foreign keys structure for table jv_global_id
-- ----------------------------
ALTER TABLE "public"."jv_global_id" ADD CONSTRAINT "jv_global_id_owner_id_fk" FOREIGN KEY ("owner_id_fk") REFERENCES "public"."jv_global_id" ("global_id_pk") ON UPDATE NO ACTION ON DELETE NO ACTION NOT DEFERRABLE INITIALLY IMMEDIATE;

存儲了每次變更的時間、變更人

-- ----------------------------
--  Table structure for jv_commit
-- ----------------------------
DROP TABLE IF EXISTS "public"."jv_commit";
CREATE TABLE "public"."jv_commit" (
    "commit_pk" int8 NOT NULL,
    "author" varchar(200) COLLATE "default",
    "commit_date" timestamp(6) NULL,
    "commit_id" numeric(22,2)
)
WITH (OIDS=FALSE);
ALTER TABLE "public"."jv_commit" OWNER TO "postgres";

-- ----------------------------
--  Primary key structure for table jv_commit
-- ----------------------------
ALTER TABLE "public"."jv_commit" ADD PRIMARY KEY ("commit_pk") NOT DEFERRABLE INITIALLY IMMEDIATE;

-- ----------------------------
--  Indexes structure for table jv_commit
-- ----------------------------
CREATE INDEX  "jv_commit_commit_id_idx" ON "public"."jv_commit" USING btree(commit_id "pg_catalog"."numeric_ops" ASC NULLS LAST);

支持自動從SpringSecurity獲取auditor

public class SpringSecurityAuthorProvider implements AuthorProvider {
    public SpringSecurityAuthorProvider() {
    }

    public String provide() {
        Authentication auth = SecurityContextHolder.getContext().getAuthentication();
        return auth == null?"unauthenticated":auth.getName();
    }
}

也可以自定義，比如

@Bean
    public AuthorProvider authorProvider() {
        return new MockAuthorProvider();
    }

用來存儲額外的信息，比如存儲了用戶id，順帶存一下用戶名等。

-- ----------------------------
--  Table structure for jv_commit_property
-- ----------------------------
DROP TABLE IF EXISTS "public"."jv_commit_property";
CREATE TABLE "public"."jv_commit_property" (
    "property_name" varchar(200) NOT NULL COLLATE "default",
    "property_value" varchar(600) COLLATE "default",
    "commit_fk" int8 NOT NULL
)
WITH (OIDS=FALSE);
ALTER TABLE "public"."jv_commit_property" OWNER TO "postgres";

-- ----------------------------
--  Primary key structure for table jv_commit_property
-- ----------------------------
ALTER TABLE "public"."jv_commit_property" ADD PRIMARY KEY ("commit_fk", "property_name") NOT DEFERRABLE INITIALLY IMMEDIATE;

-- ----------------------------
--  Indexes structure for table jv_commit_property
-- ----------------------------
CREATE INDEX  "jv_commit_property_commit_fk_idx" ON "public"."jv_commit_property" USING btree(commit_fk "pg_catalog"."int8_ops" ASC NULLS LAST);
CREATE INDEX  "jv_commit_property_property_name_property_value_idx" ON "public"."jv_commit_property" USING btree(property_name COLLATE "default" "pg_catalog"."text_ops" ASC NULLS LAST, property_value COLLATE "default" "pg_catalog"."text_ops" ASC NULLS LAST);

-- ----------------------------
--  Foreign keys structure for table jv_commit_property
-- ----------------------------
ALTER TABLE "public"."jv_commit_property" ADD CONSTRAINT "jv_commit_property_commit_fk" FOREIGN KEY ("commit_fk") REFERENCES "public"."jv_commit" ("commit_pk") ON UPDATE NO ACTION ON DELETE NO ACTION NOT DEFERRABLE INITIALLY IMMEDIATE;

可以這樣自定義

@Bean
    public CommitPropertiesProvider commitPropertiesProvider() {
        return new CommitPropertiesProvider() {
            @Override
            public Map provide() {
                return ImmutableMap.of("key", "ok");
            }
        };
    }

javers