diff --git a/index.js b/index.js
index a02d6f1..bd7d811 100644
--- a/index.js
+++ b/index.js
@@ -34,12 +34,12 @@ class ADODB {
    * @param {string} [scalar]
    * @returns {Promise}
    */
-  execute(sql, scalar) {
+  execute(sql, scalar, commandtimeout) {
     debug('cmd:', 'execute');
     debug('sql:', sql);
 
     const connection = this.connection;
-    const params = { connection, sql };
+    const params = { connection, sql, commandtimeout };
 
     if (arguments.length > 1) {
       debug('scalar:', scalar);
@@ -55,13 +55,13 @@ class ADODB {
    * @param {string} sql
    * @returns {Promise}
    */
-  query(sql) {
+  query(sql, commandtimeout) {
     debug('cmd:', 'query');
     debug('sql:', sql);
 
     const connection = this.connection;
 
-    return this.proxy.exec('query', { connection, sql });
+    return this.proxy.exec('query', { connection, sql, commandtimeout });
   }
 
   /**
@@ -71,13 +71,13 @@ class ADODB {
    * @param {string} [id]
    * @returns {Promise}
    */
-  schema(type, criteria, id) {
+  schema(type, criteria, id, commandtimeout) {
     debug('cmd:', 'schema');
     debug('type:', type);
 
     const length = arguments.length;
     const connection = this.connection;
-    const params = { connection, type };
+    const params = { connection, type, commandtimeout };
 
     if (length > 1) {
       debug('criteria:', criteria);
diff --git a/lib/adodb.js b/lib/adodb.js
index 61b8531..0e98492 100644
--- a/lib/adodb.js
+++ b/lib/adodb.js
@@ -6,4 +6,5 @@
  * @description A Node.js JavaScript Client implementing the ADODB protocol.
  * @see https://github.com/nuintun/node-adodb#readme
  */
-!function(){"use strict";function t(t){t.State&&t.Close()}function e(t){WScript.StdOut.Write(JSON.stringify(t))}function n(t){return 7===t||64===t||133===t||134===t||135===t}function r(t){return 128===t||204===t||205===t}function o(e){var n=new ActiveXObject("ADODB.Stream");n.Type=1,n.Open(),n.Position=0,n.Write(e),n.Position=0,n.Type=2;var r=n.ReadText();return t(n),r}function i(t){var e=[],i=t.Fields;if(!t.BOF||!t.EOF){var u,c,f,a,s,p=i.Count;for(t.MoveFirst();!t.EOF;){for(c={},u=0;u<p;u++)a=(f=i.Item(u)).Type,s=f.Value,n(a)?s=new Date(s):r(a)&&(s=o(s)),c[f.Name]=s;e.push(c),t.MoveNext()}}return e}"object"!=typeof JSON&&(JSON={}),function(){var t,e,n,r,o=/^[\],:{}\s]*$/,i=/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g,u=/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,c=/(?:^|:|,)(?:\s*\[)+/g,f=/[\\"\u0000-\u001f\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,a=/[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;function s(t){return t<10?"0"+t:t}function p(){return this.valueOf()}function l(t){return f.lastIndex=0,f.test(t)?'"'+t.replace(f,function(t){var e=n[t];return"string"==typeof e?e:"\\u"+("0000"+t.charCodeAt(0).toString(16)).slice(-4)})+'"':'"'+t+'"'}"function"!=typeof Date.prototype.toJSON&&(Date.prototype.toJSON=function(){return isFinite(this.valueOf())?this.getUTCFullYear()+"-"+s(this.getUTCMonth()+1)+"-"+s(this.getUTCDate())+"T"+s(this.getUTCHours())+":"+s(this.getUTCMinutes())+":"+s(this.getUTCSeconds())+"Z":null},Boolean.prototype.toJSON=p,Number.prototype.toJSON=p,String.prototype.toJSON=p),"function"!=typeof JSON.stringify&&(n={"\b":"\\b","\t":"\\t","\n":"\\n","\f":"\\f","\r":"\\r",'"':'\\"',"\\":"\\\\"},JSON.stringify=function(n,o,i){var u;if(t="",e="","number"==typeof i)for(u=0;u<i;u+=1)e+=" ";else"string"==typeof i&&(e=i);if(r=o,o&&"function"!=typeof o&&("object"!=typeof o||"number"!=typeof o.length))throw new Error("JSON.stringify");return function c(n,o){var i,u,f,a,s,p=t,O=o[n];switch(O&&"object"==typeof O&&"function"==typeof O.toJSON&&(O=O.toJSON(n)),"function"==typeof r&&(O=r.call(o,n,O)),typeof O){case"string":return l(O);case"number":return isFinite(O)?String(O):"null";case"boolean":case"null":return String(O);case"object":if(!O)return"null";if(t+=e,s=[],"[object Array]"===Object.prototype.toString.apply(O)){for(a=O.length,i=0;i<a;i+=1)s[i]=c(i,O)||"null";return f=0===s.length?"[]":t?"[\n"+t+s.join(",\n"+t)+"\n"+p+"]":"["+s.join(",")+"]",t=p,f}if(r&&"object"==typeof r)for(a=r.length,i=0;i<a;i+=1)"string"==typeof r[i]&&(f=c(u=r[i],O))&&s.push(l(u)+(t?": ":":")+f);else for(u in O)Object.prototype.hasOwnProperty.call(O,u)&&(f=c(u,O))&&s.push(l(u)+(t?": ":":")+f);return f=0===s.length?"{}":t?"{\n"+t+s.join(",\n"+t)+"\n"+p+"}":"{"+s.join(",")+"}",t=p,f}}("",{"":n})}),"function"!=typeof JSON.parse&&(JSON.parse=function(t,e){var n;if(t=String(t),a.lastIndex=0,a.test(t)&&(t=t.replace(a,function(t){return"\\u"+("0000"+t.charCodeAt(0).toString(16)).slice(-4)})),o.test(t.replace(i,"@").replace(u,"]").replace(c,"")))return n=new Function("return "+t)(),"function"==typeof e?function r(t,n){var o,i,u=t[n];if(u&&"object"==typeof u)for(o in u)Object.prototype.hasOwnProperty.call(u,o)&&((i=r(u,o))!==undefined?u[o]=i:delete u[o]);return e.call(t,n,u)}({"":n},""):n;throw new SyntaxError("JSON.parse")})}();var u,c={execute:function(n){var r,o=[],u=!!n.scalar,c=new ActiveXObject("ADODB.Connection");u&&(r=new ActiveXObject("ADODB.Recordset")),c.CursorLocation=3,c.Open(n.connection),c.Execute(n.sql),u&&(r.Open(n.scalar,c,0,1),o=i(r)),e(o),t(c),u&&t(r)},query:function(n){var r=new ActiveXObject("ADODB.Connection"),o=new ActiveXObject("ADODB.Recordset");r.CursorLocation=3,r.Open(n.connection),o.Open(n.sql,r,0,1),e(i(o)),t(o),t(r)},schema:function(n){var r,o=new ActiveXObject("ADODB.Connection");o.CursorLocation=3,o.Open(n.connection),e(i(r=n.hasOwnProperty("id")?o.OpenSchema(n.type,n.criteria,n.id):n.hasOwnProperty("criteria")?o.OpenSchema(n.type,n.criteria):o.OpenSchema(n.type))),t(r),t(o)}},f=WScript.Arguments(0),a=JSON.parse(WScript.StdIn.ReadAll());try{c[f](a)}catch(l){var s=l.number,p=l.description;p||(p="Unspecified error, SQL may contain reserved words and symbols, surround it with brackets []"),u={code:s,message:p},WScript.StdErr.Write(JSON.stringify(u))}}();
\ No newline at end of file
+!function(){"use strict";function t(t){t.State&&t.Close()}function e(t){WScript.StdOut.Write(JSON.stringify(t))}function n(t){return 7===t||64===t||133===t||134===t||135===t}function r(t){return 128===t||204===t||205===t}function o(e){var n=new ActiveXObject("ADODB.Stream");n.Type=1,n.Open(),n.Position=0,n.Write(e),n.Position=0,n.Type=2;var r=n.ReadText();return t(n),r}function i(t){var e=[],i=t.Fields;if(!t.BOF||!t.EOF){var u,c,f,a,s,p=i.Count;for(t.MoveFirst();!t.EOF;){for(c={},u=0;u<p;u++)a=(f=i.Item(u)).Type,s=f.Value,n(a)?s=new Date(s):r(a)&&(s=o(s)),c[f.Name]=s;e.push(c),t.MoveNext()}}return e}"object"!=typeof JSON&&(JSON={}),function(){var t,e,n,r,o=/^[\],:{}\s]*$/,i=/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g,u=/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,c=/(?:^|:|,)(?:\s*\[)+/g,f=/[\\"\u0000-\u001f\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,a=/[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;function s(t){return t<10?"0"+t:t}function p(){return this.valueOf()}function l(t){return f.lastIndex=0,f.test(t)?'"'+t.replace(f,function(t){var e=n[t];return"string"==typeof e?e:"\\u"+("0000"+t.charCodeAt(0).toString(16)).slice(-4)})+'"':'"'+t+'"'}"function"!=typeof Date.prototype.toJSON&&(Date.prototype.toJSON=function(){return isFinite(this.valueOf())?this.getUTCFullYear()+"-"+s(this.getUTCMonth()+1)+"-"+s(this.getUTCDate())+"T"+s(this.getUTCHours())+":"+s(this.getUTCMinutes())+":"+s(this.getUTCSeconds())+"Z":null},Boolean.prototype.toJSON=p,Number.prototype.toJSON=p,String.prototype.toJSON=p),"function"!=typeof JSON.stringify&&(n={"\b":"\\b","\t":"\\t","\n":"\\n","\f":"\\f","\r":"\\r",'"':'\\"',"\\":"\\\\"},JSON.stringify=function(n,o,i){var u;if(t="",e="","number"==typeof i)for(u=0;u<i;u+=1)e+=" ";else"string"==typeof i&&(e=i);if(r=o,o&&"function"!=typeof o&&("object"!=typeof o||"number"!=typeof o.length))throw new Error("JSON.stringify");return function c(n,o){var i,u,f,a,s,p=t,O=o[n];switch(O&&"object"==typeof O&&"function"==typeof O.toJSON&&(O=O.toJSON(n)),"function"==typeof r&&(O=r.call(o,n,O)),typeof O){case"string":return l(O);case"number":return isFinite(O)?String(O):"null";case"boolean":case"null":return String(O);case"object":if(!O)return"null";if(t+=e,s=[],"[object Array]"===Object.prototype.toString.apply(O)){for(a=O.length,i=0;i<a;i+=1)s[i]=c(i,O)||"null";return f=0===s.length?"[]":t?"[\n"+t+s.join(",\n"+t)+"\n"+p+"]":"["+s.join(",")+"]",t=p,f}if(r&&"object"==typeof r)for(a=r.length,i=0;i<a;i+=1)"string"==typeof r[i]&&(f=c(u=r[i],O))&&s.push(l(u)+(t?": ":":")+f);else for(u in O)Object.prototype.hasOwnProperty.call(O,u)&&(f=c(u,O))&&s.push(l(u)+(t?": ":":")+f);return f=0===s.length?"{}":t?"{\n"+t+s.join(",\n"+t)+"\n"+p+"}":"{"+s.join(",")+"}",t=p,f}}("",{"":n})}),"function"!=typeof JSON.parse&&(JSON.parse=function(t,e){var n;if(t=String(t),a.lastIndex=0,a.test(t)&&(t=t.replace(a,function(t){return"\\u"+("0000"+t.charCodeAt(0).toString(16)).slice(-4)})),o.test(t.replace(i,"@").replace(u,"]").replace(c,"")))return n=new Function("return "+t)(),"function"==typeof e?function r(t,n){var o,i,u=t[n];if(u&&"object"==typeof u)for(o in u)Object.prototype.hasOwnProperty.call(u,o)&&((i=r(u,o))!==undefined?u[o]=i:delete u[o]);return e.call(t,n,u)}({"":n},""):n;throw new SyntaxError("JSON.parse")})}();var u,c={execute:function(n){var r,o=[],u=!!n.scalar,c=new ActiveXObject("ADODB.Connection");n.commandtimeout && (c.CommandTimeout = n.commandtimeout);
+u&&(r=new ActiveXObject("ADODB.Recordset")),c.CursorLocation=3,c.Open(n.connection),c.Execute(n.sql),u&&(r.Open(n.scalar,c,0,1),o=i(r)),e(o),t(c),u&&t(r)},query:function(n){var r=new ActiveXObject("ADODB.Connection"),o=new ActiveXObject("ADODB.Recordset");n.commandtimeout && (r.CommandTimeout = n.commandtimeout);r.CursorLocation=3,r.Open(n.connection),o.Open(n.sql,r,0,1),e(i(o)),t(o),t(r)},schema:function(n){var r,o=new ActiveXObject("ADODB.Connection");n.commandtimeout && (o.CommandTimeout = n.commandtimeout);o.CursorLocation=3,o.Open(n.connection),e(i(r=n.hasOwnProperty("id")?o.OpenSchema(n.type,n.criteria,n.id):n.hasOwnProperty("criteria")?o.OpenSchema(n.type,n.criteria):o.OpenSchema(n.type))),t(r),t(o)}},f=WScript.Arguments(0),a=JSON.parse(WScript.StdIn.ReadAll());try{c[f](a)}catch(l){var s=l.number,p=l.description;p||(p="Unspecified error, SQL may contain reserved words and symbols, surround it with brackets []"),u={code:s,message:p},WScript.StdErr.Write(JSON.stringify(u))}}();
\ No newline at end of file