UseStmt.java

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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package org.apache.doris.analysis;

import org.apache.doris.catalog.Env;
import org.apache.doris.common.AnalysisException;
import org.apache.doris.common.ErrorCode;
import org.apache.doris.common.ErrorReport;
import org.apache.doris.common.UserException;
import org.apache.doris.mysql.privilege.PrivPredicate;
import org.apache.doris.qe.ConnectContext;

import com.google.common.base.Strings;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * Representation of a USE db statement.
 */
public class UseStmt extends StatementBase implements NotFallbackInParser {
    private static final Logger LOG = LogManager.getLogger(UseStmt.class);
    private String catalogName;
    private String database;

    public UseStmt(String db) {
        database = db;
    }

    public UseStmt(String catalogName, String db) {
        this.catalogName = catalogName;
        this.database = db;
    }

    public String getDatabase() {
        return database;
    }

    public String getCatalogName() {
        return catalogName;
    }

    @Override
    public String toSql() {
        StringBuilder sb = new StringBuilder();
        sb.append("USE ");
        if (catalogName != null) {
            sb.append("`").append(catalogName).append("`.");
        }
        sb.append("`").append(database).append("`");
        return sb.toString();
    }

    @Override
    public StmtType stmtType() {
        return StmtType.USE;
    }

    @Override
    public String toString() {
        return toSql();
    }

    public void analyze(Analyzer analyzer) throws AnalysisException, UserException {
        super.analyze(analyzer);
        if (Strings.isNullOrEmpty(database)) {
            ErrorReport.reportAnalysisException(ErrorCode.ERR_NO_DB_ERROR);
        }
        String currentCatalogName = catalogName == null ? ConnectContext.get().getDefaultCatalog() : catalogName;
        if (!Env.getCurrentEnv().getAccessManager()
                .checkDbPriv(ConnectContext.get(), currentCatalogName, database, PrivPredicate.SHOW)) {
            ErrorReport.reportAnalysisException(ErrorCode.ERR_DBACCESS_DENIED_ERROR, analyzer.getQualifiedUser(),
                    database);
        }
    }

    @Override
    public RedirectStatus getRedirectStatus() {
        return RedirectStatus.NO_FORWARD;
    }
}