From 9039b3a65492087c79cd0cd2f8d9619146234046 Mon Sep 17 00:00:00 2001
From: lidongy <1879087903@qq.com>
Date: Fri, 18 Sep 2020 09:22:12 +0800
Subject: [PATCH] =?UTF-8?q?KERNEL-5345=20refactor:=20=E5=AF=B9mysql5?=
 =?UTF-8?q?=E6=95=B0=E6=8D=AE=E5=BA=93=E7=89=B9=E6=AE=8A=E5=A4=84=E7=90=86?=
 =?UTF-8?q?=20=E6=94=B9=E5=9C=A8third?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../org/hibernate/dialect/MySQL5Dialect.java  | 19 ++++++++++++++++++-
 .../org/hibernate/dialect/MySQL8Dialect.java  | 17 +++++++++++++++++
 2 files changed, 35 insertions(+), 1 deletion(-)
 create mode 100644 fine-hibernate/src/main/java/com/fr/third/org/hibernate/dialect/MySQL8Dialect.java

diff --git a/fine-hibernate/src/main/java/com/fr/third/org/hibernate/dialect/MySQL5Dialect.java b/fine-hibernate/src/main/java/com/fr/third/org/hibernate/dialect/MySQL5Dialect.java
index beeec4c7b..0b8ee5e86 100644
--- a/fine-hibernate/src/main/java/com/fr/third/org/hibernate/dialect/MySQL5Dialect.java
+++ b/fine-hibernate/src/main/java/com/fr/third/org/hibernate/dialect/MySQL5Dialect.java
@@ -9,9 +9,11 @@ package com.fr.third.org.hibernate.dialect;
 import com.fr.third.org.hibernate.exception.spi.TemplatedViolatedConstraintNameExtracter;
 import com.fr.third.org.hibernate.exception.spi.ViolatedConstraintNameExtracter;
 import com.fr.third.org.hibernate.internal.util.JdbcExceptionHelper;
+import com.fr.third.org.hibernate.mapping.Column;
 
 import java.sql.SQLException;
 import java.sql.Types;
+import java.util.List;
 
 /**
  * An SQL dialect for MySQL 5.x specific features.
@@ -19,6 +21,9 @@ import java.sql.Types;
  * @author Steve Ebersole
  */
 public class MySQL5Dialect extends MySQLDialect {
+
+	private static final int INDEX_LENGTH_LIMIT = 255;
+
 	@Override
 	protected void registerVarcharTypes() {
 		registerColumnType( Types.VARCHAR, "longtext" );
@@ -31,7 +36,19 @@ public class MySQL5Dialect extends MySQLDialect {
 	public boolean supportsColumnCheck() {
 		return false;
 	}
-	
+
+	//utf8编码下，mysql5.7以下版本主键长度不能超过255，故特殊处理，去掉它的primary。
+	// 它默认会生成一个长度为255的前缀索引
+	@Override
+	public String getPrimaryKeyString(List<Column> columnList) {
+		for (Column column : columnList) {
+			if (column.getLength() > INDEX_LENGTH_LIMIT) {
+				return "key";
+			}
+		}
+		return "primary key";
+	}
+
 	public ViolatedConstraintNameExtracter getViolatedConstraintNameExtracter() {
 		return EXTRACTER;
 	}
diff --git a/fine-hibernate/src/main/java/com/fr/third/org/hibernate/dialect/MySQL8Dialect.java b/fine-hibernate/src/main/java/com/fr/third/org/hibernate/dialect/MySQL8Dialect.java
new file mode 100644
index 000000000..4e10003c2
--- /dev/null
+++ b/fine-hibernate/src/main/java/com/fr/third/org/hibernate/dialect/MySQL8Dialect.java
@@ -0,0 +1,17 @@
+package com.fr.third.org.hibernate.dialect;
+
+import com.fr.third.org.hibernate.mapping.Column;
+
+import java.util.List;
+
+/**
+ * @author lidongy
+ * @version 10.0
+ * Created by lidongy on 2020/9/18
+ */
+public class MySQL8Dialect extends MySQL5Dialect {
+    @Override
+    public String getPrimaryKeyString(List<Column> columnList) {
+        return "primary key";
+    }
+}