新增 支持达梦数据库

新增 Sequences 增加 updateTime
新增 增加查询序号是否锁定的方法 locked
新增 增加将序号设为未使用的方法 unused
新增 增加 SequencesUnlock find(SequencesUnlock sequencesUnlock) 和 SequencesUnused find(SequencesUnused sequencesUnused)

src/main/resources/dm/create_table_sequences.sql

@@ -0,0 +1,26 @@
+CREATE TABLE IF NOT EXISTS "sequences"
+(
+    "key"         VARCHAR(64) NOT NULL,
+    "type"        VARCHAR(64) NOT NULL,
+    "seq"         BIGINT      NOT NULL,
+    "update_time" TIMESTAMP,
+    PRIMARY KEY ("key", "type")
+);
+COMMENT ON TABLE "sequences" IS '当前序号表';
+COMMENT ON COLUMN "sequences"."key" IS '序号英文名称';
+COMMENT ON COLUMN "sequences"."type" IS '序号类型';
+COMMENT ON COLUMN "sequences"."seq" IS '已使用到的序号';
+COMMENT ON COLUMN "sequences"."update_time" IS '最后使用时间';
+
+/*
+@触发器设置，功能：自动记录更新时间
+@触发器名为 SEQUENCES_UPDATE_TIME
+@触发器执行范围为每行生效
+*/
+CREATE OR REPLACE TRIGGER SEQUENCES_UPDATE_TIME BEFORE UPDATE ON "sequences" FOR EACH ROW
+BEGIN
+    NEW."update_time":=SYSDATE;
+END;
+
+/*启动触发器*/
+ALTER TRIGGER SEQUENCES_UPDATE_TIME ENABLE;