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Check if used database is null or empty #34401

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Check if used database is null or empty #34401

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3 changes: 3 additions & 0 deletions infra/session/src/main/java/org/apache/shardingsphere/infra/session/query/QueryContext.java
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@
import org.apache.shardingsphere.infra.binder.context.statement.SQLStatementContext;
import org.apache.shardingsphere.infra.binder.context.type.TableAvailable;
import org.apache.shardingsphere.infra.exception.core.ShardingSpherePreconditions;
import org.apache.shardingsphere.infra.exception.dialect.exception.syntax.database.NoDatabaseSelectedException;
import org.apache.shardingsphere.infra.exception.dialect.exception.syntax.database.UnknownDatabaseException;
import org.apache.shardingsphere.infra.exception.generic.UnsupportedSQLOperationException;
import org.apache.shardingsphere.infra.hint.HintValueContext;
Expand Down Expand Up @@ -90,6 +91,8 @@ private Collection<String> getCurrentDatabaseNames(final ConnectionContext conne
* @return used database
*/
public ShardingSphereDatabase getUsedDatabase() {
ShardingSpherePreconditions.checkNotNull(usedDatabaseNames, NoDatabaseSelectedException::new);
ShardingSpherePreconditions.checkNotEmpty(usedDatabaseNames, NoDatabaseSelectedException::new);
ShardingSpherePreconditions.checkState(usedDatabaseNames.size() <= 1,
() -> new UnsupportedSQLOperationException(String.format("Can not support multiple logic databases [%s]", Joiner.on(", ").join(usedDatabaseNames))));
String databaseName = usedDatabaseNames.iterator().next();
Expand Down
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