KERNEL-5345 refactor: 对mysql5数据库特殊处理 改在third

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;
 	}

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";
+    }
+}