com.alibaba.druid.sql.dialect.h2.visitor.H2OutputVisitor Maven / Gradle / Ivy

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An JDBC datasource implementation.
There is a newer version: 1.2.23
/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * 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
 *
 *      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 com.alibaba.druid.sql.dialect.h2.visitor;

import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.expr.SQLQueryExpr;
import com.alibaba.druid.sql.ast.statement.SQLInsertStatement;
import com.alibaba.druid.sql.ast.statement.SQLReplaceStatement;
import com.alibaba.druid.sql.visitor.SQLASTOutputVisitor;

import java.util.List;

public class H2OutputVisitor extends SQLASTOutputVisitor implements H2ASTVisitor {
    public H2OutputVisitor(Appendable appender) {
        super(appender);
    }

    public H2OutputVisitor(Appendable appender, String dbType) {
        super(appender, dbType);
    }

    public H2OutputVisitor(Appendable appender, boolean parameterized) {
        super(appender, parameterized);
    }

    public boolean visit(SQLReplaceStatement x) {
        print0(ucase ? "MERGE INTO " : "merge into ");

        printTableSourceExpr(x.getTableName());

        List columns = x.getColumns();
        if (columns.size() > 0) {
            print0(ucase ? " KEY (" : " key (");
            for (int i = 0, size = columns.size(); i < size; ++i) {
                if (i != 0) {
                    print0(", ");
                }

                SQLExpr columnn = columns.get(i);
                printExpr(columnn);
            }
            print(')');
        }

        List valuesClauseList = x.getValuesList();
        if (valuesClauseList.size() != 0) {
            println();
            print0(ucase ? "VALUES " : "values ");
            int size = valuesClauseList.size();
            if (size == 0) {
                print0("()");
            } else {
                for (int i = 0; i < size; ++i) {
                    if (i != 0) {
                        print0(", ");
                    }
                    visit(valuesClauseList.get(i));
                }
            }
        }

        SQLQueryExpr query = x.getQuery();
        if (query != null) {
            visit(query);
        }

        return false;
    }
}