增加对sql只返回string的支持;

修复添加表单时，如果关联的数据库已存在的bug

OpenAuth.App/Form/DragForm.cs

@@ -0,0 +1,141 @@
+using System;
+using System.Linq;
+using System.Text;
+using Infrastructure;
+using Newtonsoft.Json.Linq;
+using OpenAuth.Repository;
+using OpenAuth.Repository.Interface;
+using OpenAuth.Repository.QueryObj;
+
+namespace OpenAuth.App
+{
+    /// <summary>
+    /// 拖动表单，根据表单字段创建数据库表
+    /// </summary>
+    public class DragForm: IForm
+    {
+        private IUnitWork<OpenAuthDBContext> _unitWork;
+
+        public DragForm(IUnitWork<OpenAuthDBContext> unitWork)
+        {
+            _unitWork = unitWork;
+        }
+
+        /**
+	     * 功能:  创建表单数据表格（基于sql server）
+	     */
+        public string GetSql(Repository.Domain.Form form, string dbType)
+        {
+            if (dbType == Define.DBTYPE_SQLSERVER) //Sql Server
+            {
+                // 获取字段并处理
+                var jsonArray = JsonHelper.Instance.Deserialize<JObject>(form.ContentData)["list"];
+
+                // 数据库名称
+                string tableName = form.DbName;
+
+                var exist = _unitWork.FromSql<QueryStringObj>($"select '1' as value from sysobjects where name = '{tableName}' and type = 'U'").SingleOrDefault();
+                if (exist != null) return string.Empty;
+                
+                // 创建数据表
+                StringBuilder sql = new StringBuilder($"CREATE TABLE {tableName} (   [Id] varchar(50) COLLATE Chinese_PRC_CI_AS NOT NULL,"); //主键
+
+                string sqlDefault = "";
+
+                foreach (var json in jsonArray)
+                {
+                    string type = json["type"].ToString();
+                    string name = json["model"].ToString();
+                    
+                    sql.Append("[" + name + "] " + field_type_sql(type)); //字段拼接
+
+
+                    if ("checkboxs" == type)
+                        sqlDefault += field_type_sql_default(tableName, name, "0");
+                    else
+                        sqlDefault += field_type_sql_default(tableName, name, "''");
+                }
+
+                sql.Append(");");
+
+                //设置主键
+                sql.Append("ALTER TABLE " + tableName + " ADD CONSTRAINT [PK_" + form.DbName +
+                           "] PRIMARY KEY NONCLUSTERED ([Id])");
+                sql.Append(
+                    "WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ");
+                sql.Append("ON [PRIMARY];");
+
+                //主键默认值
+                sql.Append("ALTER TABLE " + tableName + " ADD   DEFAULT (newid()) FOR [Id];");
+
+                return sql + sqlDefault;
+            }
+            else
+            {
+                // 获取字段并处理
+                var jsonArray = JsonHelper.Instance.Deserialize<JObject>(form.ContentData)["list"];
+
+                // 数据库名称
+                string tableName = form.DbName;
+                
+                var exist = _unitWork.FromSql<QueryStringObj>($"select table_name as value from information_schema.tables where table_name ='{tableName}'").SingleOrDefault();
+                if (exist != null) return string.Empty;
+                
+                // 创建数据表
+                StringBuilder sql = new StringBuilder("create table if not exists `"
+                                                      + tableName
+                                                      + "` (   Id varchar(50) not null primary key,"); //主键
+
+                foreach (var json in jsonArray)
+                {
+                    string type = json["type"].ToString();
+                    string name = json["model"].ToString();
+
+                    sql.Append("`" + name + "` " + field_type_mysql(type)); //字段拼接
+                    
+                }
+
+                sql.Append(");");
+
+                return sql.ToString();
+            }
+        }
+
+        private string field_type_sql(string leipiplugins)
+        {
+            if ("textarea" == leipiplugins || "listctrl" == leipiplugins)
+            {
+                return " text  NULL ,";
+            }
+            else if ("checkboxs" == leipiplugins)
+            {
+                return " int NOT NULL ,";
+            }
+            else
+            {
+                return " varchar(255)  NULL ,";
+            }
+        }
+
+        private string field_type_mysql(string leipiplugins)
+        {
+            if ("textarea" == leipiplugins || "listctrl" == leipiplugins)
+            {
+                return " varchar(255) null ,";
+            }
+            else if ("checkboxs" == leipiplugins)
+            {
+                return " tinyint not null ,";
+            }
+            else
+            {
+                return " varchar(255)  NULL ,";
+            }
+        }
+
+        private string field_type_sql_default(string tablename, string field, string defaultValue)
+        {
+            return "ALTER TABLE " + tablename + " ADD  DEFAULT (" + defaultValue + ") FOR [" + field + "];";
+        }
+    }
+}