Pull request #871: KERNEL-5345 refactor: hibernate特殊处理，使其可以扩展建表时的主键设置语句

Merge in CORE/base-third from ~LIDONGY/base-third:release/10.0 to release/10.0

* commit '9039b3a65492087c79cd0cd2f8d9619146234046':
  KERNEL-5345 refactor: 对mysql5数据库特殊处理 改在third
  KERNEL-5345 refactor: hibernate特殊处理，使其可以扩展建表时的主键设置语句

fine-hibernate/src/main/java/com/fr/third/org/hibernate/dialect/Dialect.java

@@ -1601,11 +1601,11 @@ public abstract class Dialect implements ConversionContext {
 	 * Build an instance of a {@link SQLExceptionConversionDelegate} for
 	 * interpreting dialect-specific error or SQLState codes.
 	 * <p/>
-	 * When {@link #buildSQLExceptionConverter} returns null, the default 
+	 * When {@link #buildSQLExceptionConverter} returns null, the default
 	 * {@link SQLExceptionConverter} is used to interpret SQLState and
 	 * error codes. If this method is overridden to return a non-null value,
 	 * the default {@link SQLExceptionConverter} will use the returned
-	 * {@link SQLExceptionConversionDelegate} in addition to the following 
+	 * {@link SQLExceptionConversionDelegate} in addition to the following
 	 * standard delegates:
 	 * <ol>
 	 *     <li>a "static" delegate based on the JDBC 4 defined SQLException hierarchy;</li>
@@ -2783,4 +2783,12 @@ public abstract class Dialect implements ConversionContext {
 	public boolean supportsNationalizedTypes() {
 		return true;
 	}
+
+	/**
+	 * 获取主键sql字符串
+	 *
+	 * @param columnList 主键列集合
+	 * @return int
+	 */
+	public String getPrimaryKeyString(List<Column> columnList) { return "primary key";}
 }

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";
+    }
+}

fine-hibernate/src/main/java/com/fr/third/org/hibernate/mapping/PrimaryKey.java

@@ -6,6 +6,7 @@
  */
 package com.fr.third.org.hibernate.mapping;
 import java.util.Iterator;
+import java.util.List;
 
 import com.fr.third.org.hibernate.dialect.Dialect;
 import com.fr.third.org.hibernate.internal.util.StringHelper;
@@ -58,7 +59,8 @@ public class PrimaryKey extends Constraint {
 	}
 
 	public String sqlConstraintString(Dialect dialect) {
-		StringBuilder buf = new StringBuilder("primary key (");
+		List<Column> columnList = getColumns();
+		StringBuilder buf = new StringBuilder(dialect.getPrimaryKeyString(columnList)).append(" (");
 		Iterator iter = getColumnIterator();
 		while ( iter.hasNext() ) {
 			buf.append( ( (Column) iter.next() ).getQuotedName(dialect) );