importPackage(Packages.smartbi.freequery.client.datasource);

var datasourceService = DataSourceService.getInstance();
var tableId = "TAB.northwind.null.products";   //目标资源的节点ID
var table = datasourceService.getTable(tableId);
var sql = "select";
var data;

function init() {
    var fieldList = table.getFields();
    var fields = [];
    for (var i = 0; i < fieldList.size(); i++) {
        var field = fieldList.get(i);
        sql = sql + " " + field.getName();
        fields[i] = {
            id: field.getId(), //字段ID
            name: field.getName(), //字段名称
            alias: field.getAlias(), //字段别名
            desc: field.getDesc(), //字段描述
            valueType: parseValueType(field.getDataType().getSQLType()) //字段数据类型：INTEGER | DOUBLE | LONG | STRING | DATETIME
        }
        if (i < fieldList.size() - 1) {
            sql = sql + ",";
        }
    }
    sql = sql + " from " + table.getName();
    return {
		// //参数列表
		// params: [{
			// id: 'Param.northwind.null.products', //参数ID
			// name: 'ParamName', //参数名称
			// alias: 'ParamAlias', //参数别名
			// desc: 'ParamDesc', //参数描述
			// nullable: true, //参数是否允许是空
			// valueType: 'STRING' //参数数据类型：INTEGER | DOUBLE | LONG | STRING | DATETIME
		// }],
		//输出字段
        fields: fields
    };
}

function getGridData(paramValues, from, count) {
    data = datasourceService.executeNoCacheable(table.getDataSource().getId(), sql);
    return data;
}


function getRowCount() {
    return data.getRowsCount();
}


/**
  关闭查询对象
*/
function close() {}

function parseValueType(type) {
    switch ("" + type) {
        case "LONG":
            return "LONG";
        case "BIGINT":
        case "INTEGER":
            return "INTEGER";
        case "BIGDECIMAL":
        case "DOUBLE":
            return "DOUBLE";
        case "TIME":
        case "DATE":
        case "DATETIME":
            return "DATETIME";
        default:
            return "STRING";
    }
}