ShowDatabaseIdCommand.java

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package org.apache.doris.nereids.trees.plans.commands;

import org.apache.doris.catalog.Column;
import org.apache.doris.catalog.DatabaseIf;
import org.apache.doris.catalog.Env;
import org.apache.doris.catalog.ScalarType;
import org.apache.doris.common.ErrorCode;
import org.apache.doris.common.ErrorReport;
import org.apache.doris.mysql.privilege.PrivPredicate;
import org.apache.doris.nereids.trees.plans.PlanType;
import org.apache.doris.nereids.trees.plans.visitor.PlanVisitor;
import org.apache.doris.qe.ConnectContext;
import org.apache.doris.qe.ShowResultSet;
import org.apache.doris.qe.ShowResultSetMetaData;
import org.apache.doris.qe.StmtExecutor;

import com.google.common.collect.Lists;

import java.util.ArrayList;
import java.util.List;

/**
 * show database id command
 */
public class ShowDatabaseIdCommand extends ShowCommand {
    private static final ShowResultSetMetaData META_DATA =
            ShowResultSetMetaData.builder()
                    .addColumn(new Column("DBName", ScalarType.createVarchar(30))).build();
    private final Long dbId;

    /**
     * constructor
     */
    public ShowDatabaseIdCommand(Long dbId) {
        super(PlanType.SHOW_DATABASE_ID_COMMAND);
        this.dbId = dbId;
    }

    @Override
    public ShowResultSet doRun(ConnectContext ctx, StmtExecutor executor) throws Exception {
        // check access first
        if (!Env.getCurrentEnv().getAccessManager().checkGlobalPriv(ConnectContext.get(), PrivPredicate.ADMIN)) {
            ErrorReport.reportAnalysisException(ErrorCode.ERR_SPECIFIC_ACCESS_DENIED_ERROR, "SHOW DATABASE");
        }
        List<List<String>> rows = Lists.newArrayList();
        DatabaseIf database = ctx.getCurrentCatalog().getDbNullable(dbId);
        if (database != null) {
            List<String> row = new ArrayList<>();
            row.add(database.getFullName());
            rows.add(row);
        }
        return new ShowResultSet(getMetaData(), rows);
    }

    @Override
    public ShowResultSetMetaData getMetaData() {
        return META_DATA;
    }

    @Override
    public <R, C> R accept(PlanVisitor<R, C> visitor, C context) {
        return visitor.visitShowDatabaseIdCommand(this, context);
    }
}