if (connectionNumber <= 0) {
throw new IllegalArgumentException("connectionNumber must be positive!");
}
this.timeOut = timeOut;
this.version = version;
this.tdhsNet = new TDHSNetForNetty();
this.charsetName = charsetName;
this.lowerCaseTableNames = lowerCaseTableNames;
NetParameters parameters = new NetParameters();
parameters.setAddress(address);
parameters.setConnectionNumber(connectionNumber);