<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">由于数据库设计完毕之后,既要支持asp.net,又要支持php,所有最终选择了mysql数据库,这样通用性更广泛一些。</span>
C#连接mysql数据库需要用到一个mysql数据库的连接驱动,两种方式可以安装。
1. mysql官网下载
下载地址为:http://dev.mysql.com/downloads/connector/net/
可以现在有mono版本或者是windows版本,直接下载安装即可,安装完毕,可以直接在项目--引用--添加引用--mysql.data.dll
2. 还有个更简单的办法,直接通过nugut直接安装
3. 安装完了,直接引用,并调用即可。
4. web.config配置数据库连接字符串
<connectionStrings>
<add name="connstring" connectionString="User Id=root;host=localhost;Database=cnseb_spider;password=;port=3306;persist security info=True;character set=utf8;" providerName="MySql.Data.MySqlClient"/>
</connectionStrings>
5. mysql操作类,可以直接使用,已经测试过了
#region 数据库连接字符串(web.config来配置),可以动态更改connectionString支持多数据库.
public static string connectionString = ConfigurationManager.ConnectionStrings["connstring"].ConnectionString;
#endregion
#region executeNonQuery
/// <summary>
/// 执行SQL语句,返回影响的记录数
/// </summary>
/// <param name="sqlstr">SQL语句</param>
/// <returns>影响的记录数</returns>
public static int executeNonQuery(string sqlstr)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(sqlstr, connection))
{
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
connection.Close();
throw e;
}
}
}
}
/// <summary>
/// 执行SQL语句,返回影响的记录数
/// </summary>
/// <param name="sqlstr">SQL语句</param>
/// <param name="cmdParms">参数</param>
/// <returns>影响的记录数</returns>
public static int executeNonQuery(string sqlstr, params MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand())
{
try
{
prepareCommand(cmd, connection, null, sqlstr, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
throw e;
}
}
}
}
/// <summary>
/// 执行多条SQL语句,实现数据库事务。
/// </summary>
/// <param name="sqlstrlist">多条SQL语句</param>
public static bool executeNoQueryTran(List<String> sqlstrlist)
{
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
conn.Open();
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = conn;
MySqlTransaction tx = conn.BeginTransaction();
cmd.Transaction = tx;
try
{
for (int n = 0; n < sqlstrlist.Count; n++)
{
string strsql = sqlstrlist[n];
if (strsql.Trim().Length > 1)
{
cmd.CommandText = strsql;
prepareCommand(cmd, conn, tx, strsql, null);
cmd.ExecuteNonQuery();
}
}
cmd.ExecuteNonQuery();
tx.Commit();
return true;
}
catch
{
tx.Rollback();
return false;
}
}
}
#endregion
#region executeScalar
/// <summary>
/// 执行一条计算查询结果语句,返回查询结果第一行第一列(object)
/// </summary>
/// <param name="sqlstr">计算查询结果语句</param>
/// <returns>查询结果(object)</returns>
public static object executeScalar(string sqlstr)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(sqlstr, connection))
{
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
connection.Close();
throw e;
}
}
}
}
/// <summary>
/// 执行一条计算查询结果语句,返回查询结果第一行第一列(object)
/// </summary>
/// <param name="sqlstr">计算查询结果语句</param>
/// <param name="cmdParms">参数</param>
/// <returns>查询结果(object)</returns>
public static object executeScalar(string sqlstr, params MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand())
{
try
{
prepareCommand(cmd, connection, null, sqlstr, cmdParms);
object obj = cmd.ExecuteScalar();
cmd.Parameters.Clear();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
throw e;
}
}
}
}
#endregion
#region ExecuteReader
/// <summary>
/// 执行查询语句,返回MySqlDataReader ( 注意:调用该方法后,一定要对MySqlDataReader进行Close )
/// </summary>
/// <param name="sqlstr">查询语句</param>
/// <returns>MySqlDataReader</returns>
public static MySqlDataReader executeReader(string sqlstr)
{
MySqlConnection connection = new MySqlConnection(connectionString);
MySqlCommand cmd = new MySqlCommand(sqlstr, connection);
try
{
connection.Open();
MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return myReader;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
throw e;
}
}
/// <summary>
/// 执行查询语句,返回MySqlDataReader ( 注意:调用该方法后,一定要对MySqlDataReader进行Close )
/// </summary>
/// <param name="sqlstr">查询语句</param>
/// <param name="cmdParms">参数</param>
/// <returns>MySqlDataReader</returns>
public static MySqlDataReader executeReader(string sqlstr, params MySqlParameter[] cmdParms)
{
MySqlConnection connection = new MySqlConnection(connectionString);
MySqlCommand cmd = new MySqlCommand();
try
{
prepareCommand(cmd, connection, null, sqlstr, cmdParms);
MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return myReader;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
throw e;
}
}
#endregion
#region ExecuteDataTable
/// <summary>
/// 执行查询语句,返回DataTable
/// </summary>
/// <param name="sqlstr">查询语句</param>
/// <returns>DataTable</returns>
public static DataTable executeDataTable(string sqlstr)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
MySqlDataAdapter command = new MySqlDataAdapter(sqlstr, connection);
command.Fill(ds, "ds");
}
catch (MySql.Data.MySqlClient.MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds.Tables[0];
}
}
/// <summary>
/// 执行查询语句,返回DataTable
/// </summary>
/// <param name="sqlstr">查询语句</param>
/// <param name="cmdParms">参数</param>
/// <returns>DataTable</returns>
public static DataTable executeDataTable(string sqlstr, params MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand();
prepareCommand(cmd, connection, null, sqlstr, cmdParms);
using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (MySql.Data.MySqlClient.MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds.Tables[0];
}
}
}
/// <summary>
/// 执行查询语句,返回DataTable,获取起始页码和结束页码之间的数据
/// </summary>
/// <param name="sqlstr">sql语句</param>
/// <param name="startResord">起始数据</param>
/// <param name="maxRecord">终止数据</param>
/// <returns></returns>
public static DataTable executeDataTable(string sqlstr, int startResord, int maxRecord)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
MySqlDataAdapter command = new MySqlDataAdapter(sqlstr, connection);
command.Fill(ds, startResord, maxRecord, "ds");
}
catch (MySql.Data.MySqlClient.MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds.Tables[0];
}
}
#endregion
/// <summary>
/// 获取分页数据 在不用存储过程情况下
/// </summary>
/// <param name="recordCount">总记录条数</param>
/// <param name="selectList">选择的列逗号隔开,支持top num</param>
/// <param name="tableName">表名字</param>
/// <param name="whereStr">条件字符 必须前加 and</param>
/// <param name="orderExpression">排序 例如 ID</param>
/// <param name="pageIdex">当前索引页</param>
/// <param name="pageSize">每页记录数</param>
/// <returns></returns>
public static DataTable getPager(out int recordCount, string selectList, string tableName, string whereStr, string orderExpression, int pageIdex, int pageSize)
{
int rows = 0;
DataTable dt = new DataTable();
MatchCollection matchs = Regex.Matches(selectList, @"top\s+\d{1,}", RegexOptions.IgnoreCase);//含有top
string sqlStr = sqlStr = string.Format("select {0} from {1} where 1=1 {2}", selectList, tableName, whereStr);
if (!string.IsNullOrEmpty(orderExpression)) { sqlStr += string.Format(" Order by {0}", orderExpression); }
if (matchs.Count > 0) //含有top的时候
{
DataTable dtTemp = executeDataTable(sqlStr);
rows = dtTemp.Rows.Count;
}
else //不含有top的时候
{
string sqlCount = string.Format("select count(*) from {0} where 1=1 {1} ", tableName, whereStr);
//获取行数
object obj = executeScalar(sqlCount);
if (obj != null)
{
rows = Convert.ToInt32(obj);
}
}
dt = executeDataTable(sqlStr, (pageIdex - 1) * pageSize, pageSize);
recordCount = rows;
return dt;
}
#region 创建command
/// <summary>
/// 创建command
/// </summary>
/// <param name="cmd"></param>
/// <param name="conn"></param>
/// <param name="trans"></param>
/// <param name="cmdText"></param>
/// <param name="cmdParms"></param>
private static void prepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, string cmdText, MySqlParameter[] cmdParms)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
cmd.CommandText = cmdText;
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = CommandType.Text;//cmdType;
if (cmdParms != null)
{
foreach (MySqlParameter parameter in cmdParms)
{
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
cmd.Parameters.Add(parameter);
}
}
}
#endregion
6. 测试调用
个人总结:其实mysql很方便的,体积小,又灵活。