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支持数据连接池 分享一个简单的C#的通用DbHelper类

C#DbHelper类

每次新项目的时候，都要从头去找一遍数据库工具类 。这里分享一个简单实用的C#的通用DbHelper工具类，支持数据连接池 。
 
连接池配置<connectionStrings><add name="dh_web" connectionString="Data Source=xxx.com;Initial Catalog=xx_db;User ID=xx;Password=**;pooling=true;max pool size=200" providerName="System.Data.SqlClient"/></connectionStrings>
 
DbHelper类public class DBHelper{private static string connectionString = ConfigurationManager.ConnectionStrings["dh_web"].ConnectionString;//不带参数的执行命令public static int ExecuteCommand(string safeSql){using (SqlConnection connection = new SqlConnection(connectionString)){connection.Open();SqlCommand cmd = new SqlCommand(safeSql, connection);return cmd.ExecuteNonQuery();}}//带参数的执行命令public static int ExecuteCommand(string sql, params SqlParameter[] values){using (SqlConnection connection = new SqlConnection(connectionString)){connection.Open();SqlCommand cmd = new SqlCommand(sql, connection);cmd.Parameters.AddRange(values);return cmd.ExecuteNonQuery();}}public static int GetScalar(string safeSql){using (SqlConnection connection = new SqlConnection(connectionString)){connection.Open();SqlCommand cmd = new SqlCommand(safeSql, connection);return Convert.ToInt32(cmd.ExecuteScalar());}}public static int GetScalar(string sql, params SqlParameter[] values){using (SqlConnection connection = new SqlConnection(connectionString)){connection.Open();SqlCommand cmd = new SqlCommand(sql, connection);cmd.Parameters.AddRange(values);return Convert.ToInt32(cmd.ExecuteScalar());}}public static SqlDataReader GetReader(string safeSql){SqlConnection connection = new SqlConnection(connectionString);connection.Open();SqlCommand cmd = new SqlCommand(safeSql, connection);return cmd.ExecuteReader(CommandBehavior.CloseConnection);}public static SqlDataReader GetReader(string sql, params SqlParameter[] values){SqlConnection connection = new SqlConnection(connectionString);connection.Open();SqlCommand cmd = new SqlCommand(sql, connection);cmd.Parameters.AddRange(values);return cmd.ExecuteReader(CommandBehavior.CloseConnection);}public static DataTable GetDataSet(string safeSql){using (SqlConnection connection = new SqlConnection(connectionString)){DataSet ds = new DataSet();SqlCommand cmd = new SqlCommand(safeSql, connection);SqlDataAdapter da = new SqlDataAdapter(cmd);da.Fill(ds);return ds.Tables[0];}}public static DataTable GetDataSet(string sql, params SqlParameter[] values){using (SqlConnection connection = new SqlConnection(connectionString)){DataSet ds = new DataSet();SqlCommand cmd = new SqlCommand(sql, connection);cmd.Parameters.AddRange(values);SqlDataAdapter da = new SqlDataAdapter(cmd);da.Fill(ds);return ds.Tables[0];}}}注意：CommandBehavior.CloseConnection解决了流读取数据模式下,数据库连接不能有效关闭的情况.当某个XXXDataReader对象在生成时使用了CommandBehavior.CloseConnection,那数据库连接将在XXXDataReader对象关闭时自动关闭.

【支持数据连接池 分享一个简单的C#的通用DbHelper类】


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