C#操作数据库
1 : App.config
<?xml version="1.0" encoding="utf-8" ?> <configuration> <connectionStrings> <add name="ConnLink" connectionString="server='localhost';database='ReportServer';UID= 'sa';PassWord='123'"></add> </connectionStrings> <startup> <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" /> </startup> </configuration>
improtant ：
<connectionStrings> <add name="ConnLink" connectionString="server='localhost';database='ReportServer';UID= 'sa';PassWord='123'"></add> </connectionStrings>
add Quote
code ：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;
namespace SQLHandel.SQL
{
/// <summary>
/// 注意此类
/// </summary>
public class SqlConnectionDemo
{
private readonly string CONN_LINK = ConfigurationManager.ConnectionStrings["ConnLink"].ToString();
public SqlConnectionDemo()
{
//test
Console.WriteLine("我得到的链接数据库的连接字符串 - > " + this.CONN_LINK);
}
/// <summary>
/// 链接数据库
/// </summary>
/// <returns>是否连接成功</returns>
public bool ConnDB()
{
SqlConnection conn = new SqlConnection(this.CONN_LINK);
bool connOK = false;
try
{
conn.Open();
connOK = true;
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
finally
{
conn.Close();
}
return connOK;
}
/// <summary>
/// 使用SqlDataReader 来获取数据
/// </summary>
public void getDataWithDataReader()
{
//注意 , 这一使用using , 确保conn对象的释放
using (SqlConnection conn = new SqlConnection(this.CONN_LINK))
{
string sql = "select * from Users where UserType = @UserType";
SqlParameter spt1 = new SqlParameter("UserType", SqlDbType.Int); // 注意 : SqlDbType 引用 using System.Data;
spt1.Value = 1;//占位赋值
SqlCommand scd = new SqlCommand();
scd.Connection = conn;
scd.CommandText = sql;
scd.Parameters.Add(spt1);//加入到Commend 中
// 注意打开数据库连接
conn.Open();
SqlDataReader dr = scd.ExecuteReader(); // 注 : SqlDataReader 没有构造函数
while (dr.Read())//Read() 相当于一个指针 , 每读一次向下移动以为 .
{
Console.WriteLine("我得到的数据 DataReader-------------------------");
Console.WriteLine("UserId : " + dr["UserId"].ToString());
Console.WriteLine("Sid : " + dr["Sid"].ToString());
Console.WriteLine("UserType : " + dr["UserType"].ToString());
Console.WriteLine("AuthType : " + dr["AuthType"].ToString());
Console.WriteLine("UserName : " + dr["UserName"].ToString());
}
dr.Dispose();
scd.Dispose();
conn.Close();
}
}
/// <summary>
/// 私用DataSet获得数据集(本人建议使用)
/// </summary>
public void getDataWithDataSet()
{
using (SqlConnection conn = new SqlConnection(this.CONN_LINK))
{
string sql = "select * from Users where UserType = @UserType ";
SqlDataAdapter sda = new SqlDataAdapter();
DataSet ds = new DataSet("Kayer"); // 虚拟库名
SqlCommand scd = new SqlCommand();
scd.CommandText = sql;
scd.Connection = conn;
SqlParameter spt1 = new SqlParameter("UserType", SqlDbType.Int);
spt1.Value = 1;
scd.Parameters.Add(spt1);
sda.SelectCommand = scd;
sda.Fill( ds, "users"); // 虚拟表名
// 对数据的解析
//第一种遍历的方式
//foreach (DataRow dr in ds.Tables["users"].Rows)
//{
// //遍历列
// Console.WriteLine("我得到的数据 数据 DataSet ----------------------------------");
// foreach (DataColumn dc in ds.Tables["users"].Columns)
// {
// Console.WriteLine(" 列 : {0} , 数据 : {1} ", dc.ColumnName, dr[dc.ColumnName]);
// }
//}
//第二种遍历的方式
for (int i = 0; i < ds.Tables["users"].Rows.Count; i += 1)
{
Console.WriteLine("我得到的数据 数据 DataSet ----------------------------------");
for (int j = 0; j < ds.Tables["users"].Columns.Count; j += 1)
{
Console.WriteLine(" 列 : {0} , 数据 : {1} ", ds.Tables["users"].Columns[j].ColumnName, ds.Tables["users"].Rows[i][j]);
}
}
ds.Dispose();
sda.Dispose();
}
}
/// <summary>
/// 运行无参存储过程
/// </summary>
public void ProNoPramHandler()
{
using (SqlConnection conn = new SqlConnection(this.CONN_LINK))
{
SqlCommand scd = new SqlCommand("ProNameNoParams", conn);
scd.CommandType = CommandType.StoredProcedure;
conn.Open();
scd.ExecuteNonQuery();
scd.Dispose();
conn.Dispose();
}
}
/// <summary>
/// 运行有参存储过程
/// </summary>
public void ProHaspramHander()
{
using (SqlConnection conn = new SqlConnection(this.CONN_LINK))
{
SqlCommand scd = new SqlCommand();
scd.Connection = conn;
scd.CommandText = "ProNameNoParams";//存储过程的名称
scd.CommandType = CommandType.StoredProcedure;
SqlParameter spt = new SqlParameter("@ParameterName", SqlDbType.Int);//存储过程的参数
spt.Direction = ParameterDirection.Input; // 输入参数
spt.Value = 1;//赋值
scd.Parameters.Add(spt);
conn.Open();
scd.ExecuteNonQuery();
scd.Dispose();
conn.Close();
conn.Dispose();
}
}
/// <summary>
/// 运行有返回值存储过程
/// </summary>
public void ProHasReturnHandler()
{
using (SqlConnection conn = new SqlConnection(this.CONN_LINK))
{
SqlCommand scd = new SqlCommand();
scd.Connection = conn;
scd.CommandText = "ProHasReturn";
scd.CommandType = CommandType.StoredProcedure;
SqlParameter spt = new SqlParameter("@id", SqlDbType.Int);
spt.Direction = ParameterDirection.Output;//存储过程返回参数设置
scd.Parameters.Add(spt);
conn.Open();
scd.ExecuteNonQuery();
int returnfromPro = Convert.ToInt32(scd.Parameters["@id"].Value);//得到存储过程返回参数
scd.Dispose();
conn.Close();
}
}
}
}
