WebService实现数据库操作

1.数据库连接：

[WebMethod]
        public string InsertPoint(string data)
        {
            //解决跨域问题
            //Context.Response.AddHeader("Access-Control-Allow-Origin", "*");
            string database = "Data Source=.;Initial Catalog=test;Persist Security Info=True;User ID=sa;Password=password1633";
            //string data = HttpContext.Current.Request["data"];
            try
            {

                if (data.Equals("") || data == null)
                {
                    return "data is null";
                }
                else
                {
                    OverlaysPoint opoint = JsonConvert.DeserializeObject<OverlaysPoint>(data);// 将接收的参数data实例化为一个对象（方便操作），注意该类的变量名要和json的key值对应 /*foreach (Data_Opoint dtpoint in opoint.overlays)
                    {
                        sql = "insert into Map_Overlays(wf_pictureid,wf_picturename,wf_railid,wf_name,wf_location,wf_createtime,wf_pid,wf_lng,wf_lat) values(‘" + "123456789" + "‘,‘" + opoint.picturename + "‘,‘" + opoint.id + "‘,‘" + opoint.name + "‘,‘" + opoint.location + "‘,‘" + opoint.createime + "‘,‘" + dtpoint.pid + "‘,‘" + dtpoint.lng.ToString() + "‘,‘" + dtpoint.lat.ToString() + "‘)";
                        ExecuteUpdate(sql, database);

                    }*/
                    string[] xyArray = opoint.position.Split(new string[] { "(", ",", ")" }, StringSplitOptions.RemoveEmptyEntries); //处理json字符串
                     //执行sql语句
                    string sql = "insert into map_img_points(miid,pointtype,pointid, pointcode, positionx, positiony, pointinfo) values (‘地图id‘, ‘" + opoint.point_type + "‘, ‘" + opoint.point_bm + "‘,‘" + opoint.point_code + "‘,‘" + xyArray[0] + "‘,‘" + xyArray[1] + "‘, ‘" + opoint.point_info + "‘)";
                    executeUpdate(sql, database);
                    return "success";

                }
            }
            catch (NullReferenceException e)
            {
                return e.StackTrace;
            }
        }

Data Source ：  一个点默认为本地数据库，其他数据库填写相应ip ； 

Initial Catelog：是目标数据库名称

我们接收一个json字符串，将其value填入一个实例化的类对象，通过这个类的实例化对象来使用它

OverlaysPoint opoint = JsonConvert.DeserializeObject<OverlaysPoint>(data);

OverPoint类：

public class OverlaysPoint
    {
        public string point_type;
        public string point_bm;
        public string point_code;
        public string position;
        public string point_info;
        public string con_bussiness;
        public string con_entity;
        public string con_fields;
        public string showpic;
        public string showtext;
        public string showdata;
        public string create_time;
        public string data_refresh_rate;
    }

executeQuery和executeUpdate方法：

//对数据库操作
        //用于查询
        private DataTable executeQuery(string sqlStr, string sqlCon)      
        {
            SqlConnection con = new SqlConnection(@sqlCon);
            con.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = con;
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = sqlStr;
            DataTable dt = new DataTable();        //实例化数据表
            SqlDataAdapter msda;
            msda = new SqlDataAdapter(cmd);        //实例化适配器
            msda.Fill(dt);                        //保存数据
            con.Close();
            return dt;
        }
        //用于增删改;
        private int executeUpdate(string sqlStr, string sqlCon)      
        {
            SqlConnection con = new SqlConnection(@sqlCon);
            con.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = con;
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = sqlStr;
            int iud = 0;
            iud = cmd.ExecuteNonQuery();
            con.Close();
            return iud;
        }

解决跨域问题：

 2.ajax调用：

var jsonOverlays = JSON.stringify(data.field).replace(/\"/g,"‘");// 将双引号替换为单引号

$.ajax({
                type:"POST",
                contentType: "application/json; charset=utf-8",
                url:"http://192.168.21.1:7777/WebService1.asmx/test",
                data: "{\"data\":\"" + jsonOverlays + "\"}",  //这是post请求要传递的参数
                dataType: ‘json‘, //预期返回类型
                success: function(result){    //回调函数
                    layer.msg(‘ajax调用成功‘ + result.d);
                    console.log(result.d);
                },
                error: function (data) {
                    //200的响应有可能被认为error, responseText中没有Message部分
                    alert(‘error‘);
                },
                complete: function (data) {
                    ; //after success ot error
                }
            });

注意2处：1.双引号替换为单引号  2.构造data的参数

2019-1-22测试无误：

如果出错，注意看浏览器端控制台报错（ajax出错）和vs输出窗口（c#方法出错）