in src/main/java/com/aliyun/ha3engine/jdbc/Ha3Connection.java [289:296]
public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability)
throws SQLException {
checkClosed();
if (this.cloudClient == null) {
throw new SQLException("Unable to connect on specified schema '" + this.schema + "'");
}
return createStatement();
}