dev-添加分页查询的特性

api/projectApi.js

@@ -19,9 +19,7 @@ module.exports = {
     // 获取全部列表
     getList: helper.listAllBuilder('project', '*', {}),
     // 获取分页列表
-    getPagedList: (req, res) => {
-        //
-    },
+    getPagedList: helper.pagedBuilder('project', 'p_id', {}),
     //新建更新数据
     saveProject: helper.saveBuilder('project', 'p_id'),
 };
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route.js

@@ -26,5 +26,6 @@ app.post("/env/", envApi.saveEnv);
 app.post("/project/", projectApi.saveProject);
 app.get("/project/", projectApi.getList);
 app.get("/project/len", projectApi.getCount);
+app.get("/project/page",projectApi.getPagedList);
 
 module.exports = app;
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tools/databaseHelper.js

@@ -43,8 +43,9 @@ var saveJsonToDb = (json, table, key) => {
  * @param {*} json 查询条件
  * @param {*} table 数据表名称
  * @param {*} items 要查询的字段
+ * @param {Object} extra 额外值
  */
-var listDbByJson = (json, table, items) => {
+var listDbByJson = (json, table, items, extra = {}) => {
     return new Promise((resovle, reject) => {
         var query = {};
         //整理字段
@@ -63,13 +64,15 @@ var listDbByJson = (json, table, items) => {
             var citems = Object.assign({}, items);
             query = _.merge(query, citems);
         }
+        //添加额外查询条件 比如order by等
+        var extraClone = Object.assign({}, extra);
+        query = _.merge(query, extraClone);
 
         var cloned = Object.assign({}, json);
         query['$where'] = cloned;
         query['$from'] = table;
-        
-        var sql = db.sql.$select(query);
 
+        var sql = db.sql.$select(query);
         db.query(sql.sql, sql.values)
             .then((rows) => {
                 resovle(rows);
@@ -79,7 +82,75 @@ var listDbByJson = (json, table, items) => {
     });
 }
 
+/**
+ * 根据条件获取数据长度
+ * @param {*} json 
+ * @param {*} table 
+ * @param {*} key 
+ */
+var countByJson = (json, table, key) => {
+    return new Promise((resovle, reject) => {
+        listDbByJson(json, table, { len: { $count: key } })
+            .then((res) => {
+                if (_.isEmpty(res)) {
+                    resovle(0)
+                }
+                resovle(res[0]['len']);
+            }).catch((err) => {
+                reject(JSON.stringify(err));
+            });
+    });
+}
+
+
+/**
+ * 获取分页数据
+ * @param {*} json  查询条件
+ * @param {*} table  
+ * @param {*} items 
+ * @param {*} key 
+ * @param {*} page 
+ * @param {*} pageSize 
+ */
+var pagedDbByJson = (json, table, items, key, page = 1, pageSize = 10) => {
+    return new Promise((resovle, reject) => {
+        countByJson(json, table, key)
+            .then((len) => {
+                if (len > 0) {
+                    return listDbByJson(json, table, items, {
+                        $limit: pageSize,
+                        $offset: (page - 1) * pageSize
+                    }).then((data) => {
+                        resovle({
+                            data,
+                            paged: {
+                                page,
+                                pageSize,
+                                total: len
+                            }
+                        });
+                    }).catch((err) => {
+                        throw new Error(err);
+                    })
+                } else {
+                    resovle({
+                        data: [],
+                        paged: {
+                            page,
+                            pageSize,
+                            total: 0
+                        }
+                    });
+                }
+            }).catch((err) => {
+                reject(JSON.stringify(err));
+            })
+    });
+}
+
 module.exports = {
     saveJsonToDb,
     listDbByJson,
+    countByJson,
+    pagedDbByJson,
 }
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tools/helper.js

@@ -42,7 +42,29 @@ var listAllBuilder = (table, items, condition, translate = (x) => { return x })
     };
 }
 
+/**
+ * 分页查询构建器
+ * @param {*} table 
+ * @param {*} key 
+ * @param {*} items 
+ */
+var pagedBuilder = (table, key, items) => {
+    return (req, res) => {
+        var page = _.toInteger(_.get(req.query, 'page', 1));
+        var pageSize = _.toInteger(_.get(req.query, 'pageSize', 10));
+        _.unset(req.query, 'page');
+        _.unset(req.query, 'pageSize');
+        databaseHelper.pagedDbByJson(req.query, table, items, key, page, pageSize)
+            .then((data) => {
+                res.end(JSON.stringify(data));
+            }).catch((err) => {
+                res.end(JSON.stringify(err));
+            })
+    };
+}
+
 module.exports = {
     saveBuilder,
     listAllBuilder,
+    pagedBuilder,
 };
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