[GitHub] [shardingsphere] strongduanmu commented on a change in pull request #7573: migrate some methods in InsertStatement to InsertStatementContext

[GitBox <gi...@apache.org>]

strongduanmu commented on a change in pull request #7573:
URL: https://github.com/apache/shardingsphere/pull/7573#discussion_r493449893



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File path: shardingsphere-sql-parser/shardingsphere-sql-parser-statement/src/main/java/org/apache/shardingsphere/sql/parser/sql/dialect/handler/dml/InsertStatementHandler.java
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@@ -0,0 +1,165 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.shardingsphere.sql.parser.sql.dialect.handler.dml;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.assignment.AssignmentSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.assignment.InsertValuesSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.assignment.SetAssignmentSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.column.ColumnSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.column.OnDuplicateKeyColumnsSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.ExpressionSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.generic.WithSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.InsertStatement;
+import org.apache.shardingsphere.sql.parser.sql.dialect.statement.mysql.MySQLStatement;
+import org.apache.shardingsphere.sql.parser.sql.dialect.statement.mysql.dml.MySQLInsertStatement;
+import org.apache.shardingsphere.sql.parser.sql.dialect.statement.postgresql.PostgreSQLStatement;
+import org.apache.shardingsphere.sql.parser.sql.dialect.statement.postgresql.dml.PostgreSQLInsertStatement;
+import org.apache.shardingsphere.sql.parser.sql.dialect.statement.sqlserver.SQLServerStatement;
+import org.apache.shardingsphere.sql.parser.sql.dialect.statement.sqlserver.dml.SQLServerInsertStatement;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * InsertStatement handler for different dialect SQLStatements.
+ */
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public final class InsertStatementHandler {
+
+    /**
+     * Get OnDuplicateKeyColumnsSegment.
+     *
+     * @param insertStatement InsertStatement
+     * @return OnDuplicateKeyColumnsSegment
+     */
+    public static Optional<OnDuplicateKeyColumnsSegment> getOnDuplicateKeyColumnsSegment(final InsertStatement insertStatement) {
+        if (insertStatement instanceof MySQLStatement) {
+            return ((MySQLInsertStatement) insertStatement).getOnDuplicateKeyColumns();
+        }
+        return Optional.empty();
+    }
+
+    /**
+     * Get SetAssignmentSegment.
+     *
+     * @param insertStatement InsertStatement
+     * @return SetAssignmentSegment
+     */
+    public static Optional<SetAssignmentSegment> getSetAssignmentSegment(final InsertStatement insertStatement) {
+        if (insertStatement instanceof MySQLStatement) {
+            return ((MySQLInsertStatement) insertStatement).getSetAssignment();
+        }
+        return Optional.empty();
+    }
+
+    /**
+     * Get WithSegment.
+     *
+     * @param insertStatement InsertStatement
+     * @return WithSegment
+     */
+    public static Optional<WithSegment> getWithSegment(final InsertStatement insertStatement) {
+        if (insertStatement instanceof PostgreSQLStatement) {
+            return ((PostgreSQLInsertStatement) insertStatement).getWithSegment();
+        }
+        if (insertStatement instanceof SQLServerStatement) {
+            return ((SQLServerInsertStatement) insertStatement).getWithSegment();
+        }
+        return Optional.empty();
+    }
+    
+    /**
+     * Get column names.
+     *
+     * @param insertStatement InsertStatement
+     * @return column names collection
+     */
+    public static List<String> getColumnNames(final InsertStatement insertStatement) {
+        Optional<SetAssignmentSegment> setAssignment = getSetAssignmentSegment(insertStatement);
+        return setAssignment.isPresent() ? getColumnNamesForSetAssignment(setAssignment.get()) : getColumnNamesForInsertColumns(insertStatement.getColumns());
+    }
+    
+    private static List<String> getColumnNamesForSetAssignment(final SetAssignmentSegment setAssignment) {
+        List<String> result = new LinkedList<>();
+        for (AssignmentSegment each : setAssignment.getAssignments()) {
+            result.add(each.getColumn().getIdentifier().getValue().toLowerCase());
+        }
+        return result;
+    }
+    
+    private static List<String> getColumnNamesForInsertColumns(final Collection<ColumnSegment> columns) {
+        List<String> result = new LinkedList<>();
+        for (ColumnSegment each : columns) {
+            result.add(each.getIdentifier().getValue().toLowerCase());
+        }
+        return result;
+    }
+    
+    /**
+     * Get value count for per value list.
+     *
+     * @param insertStatement InsertStatement
+     * @return value count
+     */
+    public static int getValueCountForPerGroup(final InsertStatement insertStatement) {

Review comment:
       > Since `getValueCountForPerGroup` is only used by `GeneratedKeyContextEngine`, do you think it is better to move it to `GeneratedKeyContextEngine`?
   
   @tristaZero Yes, I agree with you, there is really no other scenario using this method.
   




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