ventuz连接mysql8.0操作

Ventuz-MySQL8.0数据连接操作说明
方法介绍
Ventuz连接数据库有两种方法：
第一种：采用database节点连接query查询
第二种：写c#脚本连接

方法一：

前期准备
工具：ventuz designer5 MySQL8.0
设置节点：

图1-1 ventuz节点图
C#脚本
双击c#脚本节点，设置input output
Input：点击+号键添加Method1 和reset方法
Output：点击+号键添加String1变量用于输出数据库值（方法数量、方法体及变量类型根据需要设定）

图1-2 input设置
脚本代码：

using System;  - using Ventuz.Kernel;  - using System.Data.Odbc;  - using System.Data;  -   - public class Script : ScriptBase, System.IDisposable  - {  -     // This member is used by the Validate() method to indicate  -     // whether the Generate() method should return true or false  -     // during its next execution.  -     private bool changed;  -       -     // This Method is called if the component is loaded/created.  -     public Script()  -     {  -         // Note: Accessing input or output properties from this method  -         // will have no effect as they have not been allocated yet.  -     }  -       -     // This Method is called if the component is unloaded/disposed  -     public virtual void Dispose()  -     {  -     }  -       -     // This Method is called if an input property has changed its value  -     public override void Validate()  -     {  -         // Remember: set changed to true if any of the output   -         // properties has been changed, see Generate()  -     }  -       -     // This Method is called every time before a frame is rendered.  -     // Return value: if true, Ventuz will notify all nodes bound to this  -     //               script node that one of the script's outputs has a  -     //               new value and they therefore need to validate. For  -     //               performance reasons, only return true if output  -     //               values really have been changed.  -     public override bool Generate()  -     {  -         changed = true;  -         return true;  -     }  -       -     // This Method is called if the function/method Method1 is invoked by the user or a bound event.  -     // Return true, if this component has to be revalidated!  -     public bool OnMethod1(int arg)  -     {     -         String1 = "";  -         string strconn = "DRIVER={MySQL ODBC 8.0 Unicode Driver};SERVER=localhost;DATABASE=databaseName;USER=userName;PASSWORD=password;OPTION=3;";  -         string sql = "select name from table";   -         OdbcConnection con = new OdbcConnection(strconn);  //建立连接对象  -         con.Open();  -         OdbcCommand com = new OdbcCommand(sql, con);    //执行查询语句赋值给com对象  -         OdbcDataReader reader = com.ExecuteReader();  -         //读到数据时写入String1  -         while (reader.Read())                        -         {  -             String1 += reader[0].ToString() + " ";  -         }  -         con.Close();  -         return true;  -     }  -       -     // This Method is called if the function/method reset is invoked by the user or a bound event.  -     // Return true, if this component has to be revalidated!  -     public bool Onreset(int arg)  -     {  -         String1 = "";  -         return false;  -     } - }

执行
点击图示方法即可显示数据库内容

图1-3 执行结果

方法二

前期准备
设置节点：

图2-1 ventuz节点图
连接字符串：可以查询官网：https://www.connectionstrings.com/
我的数据库版本是mysql8.0 采用ODBC连接

图2-2 odbc数据源设置

附我的ConnectionString供参考：

DRIVER={MySQL ODBC 8.0 Unicode Driver};SERVER=localhost; DATABASE=databaseName; USER=userName; PASSWORD=password;OPTION=3;

细节操作
Query节点
Query节点用于书写sql语句，点击执行即可查看输出结果

图2-3 query节点设置
Row节点
Ventuz通过query节点输出dataset，row节点就用来显示dataset

图2-4 row节点input设置
要实现数据绑定，要选择output的数据类型并设置数据名称，要与数据库定义对应

图2-5 row节点output设置

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