From 1b21708c3068907ac6f27f5b955d3722fae530c0 Mon Sep 17 00:00:00 2001
From: StringKe <authemail@qq.com>
Date: Sun, 26 May 2024 12:46:02 +0800
Subject: [PATCH] =?UTF-8?q?feat(dialect):=20=E6=B7=BB=E5=8A=A0=20PostgreSQ?=
 =?UTF-8?q?L=20=E6=96=B9=E8=A8=80=E5=AE=9E=E7=8E=B0?=
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添加了 PostgreSQLJdbcDialect 类的实现，以支持 Postgres 数据库的代码生成功能。

主要避免关键词导致的生成失败比如 user
---
 .../mybatisflex/codegen/dialect/IDialect.java |  6 ++++
 .../dialect/impl/PostgreSQLJdbcDialect.java   | 29 +++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 mybatis-flex-codegen/src/main/java/com/mybatisflex/codegen/dialect/impl/PostgreSQLJdbcDialect.java

diff --git a/mybatis-flex-codegen/src/main/java/com/mybatisflex/codegen/dialect/IDialect.java b/mybatis-flex-codegen/src/main/java/com/mybatisflex/codegen/dialect/IDialect.java
index 67ab6b5b..964159b6 100644
--- a/mybatis-flex-codegen/src/main/java/com/mybatisflex/codegen/dialect/IDialect.java
+++ b/mybatis-flex-codegen/src/main/java/com/mybatisflex/codegen/dialect/IDialect.java
@@ -20,6 +20,7 @@ import com.mybatisflex.codegen.dialect.impl.DefaultJdbcDialect;
 import com.mybatisflex.codegen.dialect.impl.MySqlJdbcDialect;
 import com.mybatisflex.codegen.dialect.impl.OracleJdbcDialect;
 import com.mybatisflex.codegen.dialect.impl.SqliteDialect;
+import com.mybatisflex.codegen.dialect.impl.PostgreSQLJdbcDialect;
 import com.mybatisflex.codegen.entity.Table;
 
 import java.sql.Connection;
@@ -54,6 +55,11 @@ public interface IDialect {
      */
     IDialect SQLITE = new SqliteDialect();
 
+    /**
+     * PostgreSQL 方言。
+     */
+    IDialect POSTGRESQL = new PostgreSQLJdbcDialect();
+
     /**
      * 构建表和列的信息。
      *
diff --git a/mybatis-flex-codegen/src/main/java/com/mybatisflex/codegen/dialect/impl/PostgreSQLJdbcDialect.java b/mybatis-flex-codegen/src/main/java/com/mybatisflex/codegen/dialect/impl/PostgreSQLJdbcDialect.java
new file mode 100644
index 00000000..2d9962db
--- /dev/null
+++ b/mybatis-flex-codegen/src/main/java/com/mybatisflex/codegen/dialect/impl/PostgreSQLJdbcDialect.java
@@ -0,0 +1,29 @@
+/*
+ *  Copyright (c) 2022-2023, Mybatis-Flex (fuhai999@gmail.com).
+ *  <p>
+ *  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
+ *  <p>
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *  <p>
+ *  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.mybatisflex.codegen.dialect.impl;
+
+import com.mybatisflex.codegen.dialect.AbstractJdbcDialect;
+import com.mybatisflex.core.util.StringUtil;
+
+/**
+ * @author strignke
+ */
+public class PostgreSQLJdbcDialect extends AbstractJdbcDialect {
+    @Override
+    protected String forBuildColumnsSql(String schema, String tableName) {
+        return "SELECT * FROM " + (StringUtil.isNotBlank(schema) ? schema + "." : "") + "\"" + tableName + "\"" + " WHERE 1 = 2";
+    }
+}