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rn_supermap 一款基于React-Native框架的移动应用开发工具。基于该开发工具，用户可以使用JavaScript开发语言，开发出在Android和IOS操作系统下运行的原生移动GIS应用，入门门槛低，一次开发，处处运行。
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<h1 class="page-title">Source: QueryParameter.js</h1>
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<pre class="prettyprint source linenums"><code>/*********************************************************************************
Copyright © SuperMap. All rights reserved.
Author: Will
E-mail: pridehao@gmail.com
**********************************************************************************/
import {NativeModules} from 'react-native';
let QP = NativeModules.JSQueryParameter;
const NAME_QUERYPARAMETER = "QueryParameter";
/**
* @class QueryParameter
* @description 查询参数类。
用于描述一个条件查询的限制条件，如所包含的 SQL 语句，游标方式等。
条件查询，是查询满足一定条件的所有要素的记录，其查询得到的结果是记录集。查询参数类是用来设置条件查询的查询条件从而得到记录集。
SQL查询，又称属性查询，即通过构建包含属性字段、运算符号和数值的 SQL 条件语句来选择记录，从而得到记录集。
*/
export default class QueryParameter {
/**
* 创建一个QueryParameter对象
* @memberOf QueryParameter
* @returns {Promise.<QueryParameter>}
*/
async createObj(){
try{
var {queryParameterId} = await QP.createObj();
var queryParameter = new QueryParameter();
queryParameter._SMQueryParameterId = queryParameterId;
//Return records in batches. by default, 20 records
//first batch would be return(initial with "1")
queryParameter.size = 10;
queryParameter.batch = 1;
return queryParameter;
}catch (e){
console.error(e);
}
}
/**
* 设置属性过滤器
* @memberOf QueryParameter
* @param {string} attributeFilter - 被过滤的字段
* @returns {Promise.<void>}
*/
async setAttributeFilter (attributeFilter){
try{
typeof attributeFilter == "string" &&
await QP.setAttributeFilter(this._SMQueryParameterId,attributeFilter);
}catch (e){
console.error(e);
}
}
/**
* 设置Group聚合项
* @memberOf QueryParameter
* @param {string[]} groups - 传入要聚合的属性
* @returns {Promise.<void>}
*/
async setGroupBy(groups){
try{
if(testArray(groups)){
await QP.setGroupBy(this._SMQueryParameterId,groups);
}
}catch (e){
console.error(e);
}
}
/**
* 设置查询结果是否包含矢量
* @memberOf QueryParameter
* @param {boolean} has - 是否包含矢量
* @returns {Promise.<void>}
*/
async setHasGeometry(has){
try{
await QP.setHasGeometry(this._SMQueryParameterId,has);
}catch (e){
console.error(e);
}
}
/**
* 设置结果集字段
* @memberOf QueryParameter
* @param {string[]} fields - 设置返回的字段名称
* @returns {Promise.<void>}
*/
async setResultFields(fields){
try{
if(testArray(fields)){
await QP.setResultFields(this._SMQueryParameterId,fields);
}
}catch (e){
console.error(e);
}
}
/**
* 设置返回结果排序
* @memberOf QueryParameter
* @param {string[]} fields - 设置排序的字段名称
* @returns {Promise.<void>}
*/
async setOrderBy(fields){
try{
if(testArray(fields)){
await QP.setOrderBy(this._SMQueryParameterId,fields);
}
}catch (e){
console.error(e);
}
}
/**
* 设置空间查询对象
* @memberOf QueryParameter
* @param {object} geometry - 传入空间查询对象
* @returns {Promise.<void>}
*/
async setSpatialQueryObject(geometry){
try{
await QP.setSpatialQueryObject(this._SMQueryParameterId,geometry._SMGeometryId);
}catch (e){
console.error(e);
}
}
/**
*设置空间查询对象模式
* @memberOf QueryParameter
* @param mode - 传入空间查询模式
* @returns {Promise.<void>}
*/
async setSpatialQueryMode(mode){
try{
console.log("QueryParameter:" + mode);
typeof mode == "number" && await QP.setSpatialQueryMode(this._SMQueryParameterId,mode);
}catch (e){
console.error(e);
}
}
}
function testArray(arr) {
if(!(arr instanceof Array)){
console.error(NAME_QUERYPARAMETER + ":only accept a array as the args.");
return false;
}else if(arr.length < 1){
console.error(NAME_QUERYPARAMETER + ":this is an empty array.");
return false;
}else{
return true;
}
}
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