REST API：将参数传递给Vertx pgclient中的prepareQuery

问题描述

这是我的API的响应：

"The number of parameters to execute should be consistent with the expected number of parameters = [2] but the actual number is [0]."

我使用pgClient Vert.x 3.9.3，并使用了各种REST API，没有问题，但是.... 此查询中（可能是错误的）

private static final String SELECT_CBA = "select art.leyenda,$1::numeric(10,3) as cantidad,uni.abreviatura,\r"
+ "round(((art.precio_costo * (art.utilidad_fraccionado/100)) + art.precio_costo) * $2::numeric(10,3),2) as totpagar \r"
+ "FROM public.articulos art join public.unidades uni on uni.idunidad = art.idunidad \r"
+ "WHERE (substring(art.codigobarra,1,2) = \'$3\' and substring(art.codigobarra,3,6) = \'$4\')";

一些解释
$ 1和$ 2是相同的参数； $ 2和$ 3必须用引号引起来。这是我的休息记录：

poolClient = PgPool.pool(vertx,options,poolOptions);      
bizArticulo = new BizArticulo(poolClient);
Router router = Router.router(vertx);
router.route("/api/articulos*").handler(BodyHandler.create());
router.get("/api/articulos").handler(bizArticulo::getAll);
router.get("/api/articulos/:cantcomp1/:cantcomp2/:tipoprod/:prodpadre").handler(bizArticulo::getoneReadingBarcode);

其中：cantcomp1-> $ 1，：cantcomp2-> $ 2，：tipoprod-> $ 3和$ 4->：prodpadre

最后，这是我的“生意”

public void getoneReadingBarcode(RoutingContext routingContext) {       
        HttpServerResponse response = routingContext.response();
        pgClient
        .preparedQuery(SELECT_CBA)      
        .execute(ar -> {
            if (ar.succeeded()) {
                RowSet<Row> rows = ar.result();
                List<Articulo> articulos = new ArrayList<>();
                rows.forEach(row -> {
                    articulos.add(fromBarCode(row));
                });
                response.putHeader("content-type","application/json; charset=utf-8")
                .setStatusCode(200)
                .end(Json.encodePrettily(articulos));
            } else {
                System.out.println("Failure: " + ar.cause().getMessage());
                response.putHeader("content-type","application/json; charset=utf-8")
                .end(Json.encodePrettily(ar.cause().getMessage()));
            }
        });
    }

在邮递员中，我写道：

192.168.0.15:8092/api/articulos/ 0.750 / 0.750 / 20 / 021162 ；我假设参数匹配，但返回上述错误。怎么了？任何帮助，将不胜感激埃内斯托（Ernesto）

解决方法

好，我对自己说... 首先：对查询（SELECT_CB）的修复不多，我在括号中放入了参数$ 1，$ 2...。

private static final String SELECT_CBA = "select art.leyenda,($1::numeric(10,3)) as cantidad,uni.abreviatura,\r"
+ "round(((art.precio_costo * (art.utilidad_fraccionado/100)) + art.precio_costo) * ($2::numeric(10,3)),2) as totpagar \r"
+ "FROM public.articulos art join public.unidades uni on uni.idunidad = art.idunidad \r"
+ "WHERE (substring(art.codigobarra,1,2) = ($3) and substring(art.codigobarra,3,6) = ($4))";

第二：从上下文中获取了参数（请参阅上一个问题中的 router.context ）

Double cantComprada1 = Double.parseDouble(routingContext.request().getParam("cantcomp1"));
Double cantComprada2 = Double.parseDouble(routingContext.request().getParam("cantcomp2"));
String tipoProducto = routingContext.request().getParam("tipoprod");
String productoPadre = routingContext.request().getParam("prodpadre");

和第三：将参数作为参数

pgClient
.preparedQuery(SELECT_CBA)
.execute(Tuple.of(cantComprada1,cantComprada2,tipoProducto,productoPadre),ar -> {
......
......
}

一切正常

rest vert.x vert.x-webclient