C#通用DbHelper类
已秃未强 人气:2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) SqlCommand cmd = new SqlCommand(sql, connection); cmd.Parameters.AddRange(values); public static int GetScalar(string safeSql) return Convert.ToInt32(cmd.ExecuteScalar()); public static int GetScalar(string sql, params SqlParameter[] values) 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) SqlCommand cmd = new SqlCommand(sql, connection); cmd.Parameters.AddRange(values); public static DataTable GetDataSet(string safeSql) DataSet ds = new DataSet(); SqlDataAdapter da = new SqlDataAdapter(cmd); da.Fill(ds); return ds.Tables[0]; public static DataTable GetDataSet(string sql, params SqlParameter[] values) { }
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.
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