com.alibaba.druid.sql.dialect.clickhouse.parser.ClickhouseStatementParser Maven / Gradle / Ivy

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An JDBC datasource implementation.
There is a newer version: 1.2.23
package com.alibaba.druid.sql.dialect.clickhouse.parser;

import com.alibaba.druid.sql.ast.SQLName;
import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.ast.statement.SQLUpdateSetItem;
import com.alibaba.druid.sql.ast.statement.SQLWithSubqueryClause;
import com.alibaba.druid.sql.dialect.clickhouse.ast.ClickhouseAlterTableUpdateStatement;
import com.alibaba.druid.sql.parser.*;

public class ClickhouseStatementParser extends SQLStatementParser {
    public ClickhouseStatementParser(String sql) {
        super(new ClickhouseExprParser(sql));
    }

    public ClickhouseStatementParser(String sql, SQLParserFeature... features) {
        super(new ClickhouseExprParser(sql, features));
    }

    public ClickhouseStatementParser(Lexer lexer) {
        super(new ClickhouseExprParser(lexer));
    }

    public SQLSelectParser createSQLSelectParser() {
        return new ClickhouseSelectParser(this.exprParser, selectListCache);
    }

    @Override
    public SQLWithSubqueryClause parseWithQuery() {
        SQLWithSubqueryClause withQueryClause = new SQLWithSubqueryClause();
        if (lexer.hasComment() && lexer.isKeepComments()) {
            withQueryClause.addBeforeComment(lexer.readAndResetComments());
        }

        accept(Token.WITH);

        for (; ; ) {
            SQLWithSubqueryClause.Entry entry = new SQLWithSubqueryClause.Entry();
            entry.setParent(withQueryClause);

            if (lexer.token() == Token.LPAREN) {
                lexer.nextToken();
                switch (lexer.token()) {
                    case VALUES:
                    case WITH:
                    case SELECT:
                        entry.setSubQuery(
                            this.createSQLSelectParser()
                                .select());
                        break;
                    default:
                        break;
                }
                accept(Token.RPAREN);

            } else {
                entry.setExpr(exprParser.expr());
            }

            accept(Token.AS);
            String alias = this.lexer.stringVal();
            lexer.nextToken();
            entry.setAlias(alias);

            withQueryClause.addEntry(entry);

            if (lexer.token() == Token.COMMA) {
                lexer.nextToken();
                continue;
            }

            break;
        }

        return withQueryClause;
    }

    public SQLCreateTableParser getSQLCreateTableParser() {
        return new ClickhouseCreateTableParser(this.exprParser);
    }

    @Override
    public SQLStatement parseAlter() {
        Lexer.SavePoint mark = lexer.mark();
        accept(Token.ALTER);
        if (lexer.token() == Token.TABLE) {
            lexer.nextToken();
            SQLName tableName = this.exprParser.name();
            SQLName clusterName = null;
            if (lexer.token() == Token.ON) {
                lexer.nextToken();
                acceptIdentifier("CLUSTER");
                clusterName = this.exprParser.name();
            }
            if (lexer.token() == Token.UPDATE) {
                ClickhouseAlterTableUpdateStatement stmt = new ClickhouseAlterTableUpdateStatement(getDbType());
                stmt.setTableName(tableName);
                stmt.setClusterName(clusterName);
                lexer.nextToken();
                for (; ; ) {
                    SQLUpdateSetItem item = this.exprParser.parseUpdateSetItem();
                    stmt.getItems().add(item);
                    if (lexer.token() != Token.COMMA) {
                        break;
                    }
                    lexer.nextToken();
                }
                SQLName partitionId = null;
                if (lexer.token() == Token.IN) {
                    lexer.nextToken();
                    accept(Token.PARTITION);
                    partitionId = this.exprParser.name();
                }
                stmt.setPartitionId(partitionId);
                if (lexer.token() == Token.WHERE) {
                    lexer.nextToken();
                    stmt.setWhere(this.exprParser.expr());
                }
                return stmt;
            } else {
                lexer.reset(mark);
                return super.parseAlter();
            }
        }
        throw new ParserException("TODO " + lexer.info());
    }
}