Merge remote-tracking branch 'origin/3.0' into 3.0

mybatis-plus-extension/src/main/java/com/baomidou/mybatisplus/extension/plugins/pagination/DialectFactory.java

@@ -70,7 +70,6 @@ public class DialectFactory {
                 || dbType == DbType.VERTICA
                 || dbType == DbType.REDSHIFT
                 || dbType == DbType.OPENGAUSS
-                || dbType == DbType.TDENGINE
                 || dbType == DbType.UXDB) {
                 dialect = new PostgreDialect();
             }
@@ -94,6 +93,8 @@ public class DialectFactory {
                 dialect = new GBase8sDialect();
             } else if (dbType == DbType.INFORMIX) {
                 dialect = new InformixDialect();
+            } else if (dbType == DbType.TDENGINE) {
+                dialect = new TdengineDialect();
             }
             DIALECT_ENUM_MAP.put(dbType, dialect);
         }

mybatis-plus-extension/src/main/java/com/baomidou/mybatisplus/extension/plugins/pagination/dialects/TdengineDialect.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2011-2022, baomidou (jobob@qq.com).
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.baomidou.mybatisplus.extension.plugins.pagination.dialects;
+
+import com.baomidou.mybatisplus.core.enums.SqlKeyword;
+import com.baomidou.mybatisplus.extension.plugins.pagination.DialectModel;
+
+/**
+ * Tdengine 数据库分页语句组装实现
+ * 带有group by时使用 SLIMIT，如果存在嵌套查询时则可能有问题
+ *
+ * @author aispringli
+ * @since 2023-04-20
+ */
+public class TdengineDialect implements IDialect {
+
+    @Override
+    public DialectModel buildPaginationSql(String originalSql, long offset, long limit) {
+        StringBuilder sql = new StringBuilder(originalSql);
+        if (originalSql.contains(SqlKeyword.GROUP_BY.getSqlSegment())) {
+            sql.append(" SLIMIT ");
+        } else {
+            sql.append(" LIMIT ");
+        }
+        sql.append(FIRST_MARK);
+        if (offset != 0L) {
+            sql.append(" OFFSET ").append(SECOND_MARK);
+            return new DialectModel(sql.toString(), limit, offset).setConsumerChain();
+        } else {
+            return new DialectModel(sql.toString(), limit).setConsumer(true);
+        }
+    }
+}