ticatec-node-common-library/lib/db/DBConnection.js

A set of common classes for node express apps.

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
class DBConnection {
    /**
     * 执行select查询语句，返回数据列表
     * @param sql
     * @param params
     * @param postConstruction
     */
    listQuery(sql, params, postConstruction) {
        return __awaiter(this, void 0, void 0, function* () {
            let result = yield this.fetchData(sql, params, postConstruction);
            let list = this.resultToList(result);
            if (postConstruction) {
                list.forEach(data => postConstruction(data));
            }
            return list;
        });
    }
    /**
     * 查询单条记录，如果有多条，返回第一条
     * @param sql
     * @param params
     * @param postConstruction
     */
    find(sql, params, postConstruction) {
        return __awaiter(this, void 0, void 0, function* () {
            let result = yield this.fetchData(sql, params, postConstruction);
            let row = this.getFirstRow(result);
            if (row && postConstruction) {
                postConstruction(row);
            }
            return row;
        });
    }
    /**
     * 下划线转换驼峰
     * @param name
     * @returns {*}
     */
    toCamel(name) {
        return name.replace(/\_(\w)/g, (all, letter) => {
            return letter.toUpperCase();
        });
    }
    /**
     * 构建字段对应列表
     * @param fields
     * @protected
     */
    buildFieldsMap(fields) {
        return null;
    }
    /**
     * 将返回的多行数据转换成数组对象
     * @param result
     * @protected
     */
    resultToList(result) {
        let list = [];
        let fields = this.buildFieldsMap(result.fields);
        result.rows.forEach(row => {
            let obj = {};
            fields.forEach((value, key) => {
                obj[value] = row[key];
            });
            list.push(obj);
        });
        return list;
    }
    /**
     * 返回设定结果集大小的附加语句
     * @param rowCount
     * @param offset
     */
    getRowSetLimitClause(rowCount, offset) {
        return ` limit ${rowCount} offset ${offset}`;
    }
}
exports.default = DBConnection;
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