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
DbHelper类
public classDBHelper
{
private static string connectionString = ConfigurationManager.ConnectionStrings["dh_web"].ConnectionString;
//不带参数的执行命令
public static int ExecuteCommand(stringsafeSql)
{
using (SqlConnection connection = newSqlConnection(connectionString))
{
connection.Open();
SqlCommand cmd = newSqlCommand(safeSql, connection);
returncmd.ExecuteNonQuery();
}
}
//带参数的执行命令
public static int ExecuteCommand(string sql, paramsSqlParameter[] values)
{
using (SqlConnection connection = newSqlConnection(connectionString))
{
connection.Open();
SqlCommand cmd = newSqlCommand(sql, connection);
cmd.Parameters.AddRange(values);
returncmd.ExecuteNonQuery();
}
}
public static int GetScalar(stringsafeSql)
{
using (SqlConnection connection = newSqlConnection(connectionString))
{
connection.Open();
SqlCommand cmd = newSqlCommand(safeSql, connection);
returnConvert.ToInt32(cmd.ExecuteScalar());
}
}
public static int GetScalar(string sql, paramsSqlParameter[] values)
{
using (SqlConnection connection = newSqlConnection(connectionString))
{
connection.Open();
SqlCommand cmd = newSqlCommand(sql, connection);
cmd.Parameters.AddRange(values);
returnConvert.ToInt32(cmd.ExecuteScalar());
}
}
public static SqlDataReader GetReader(stringsafeSql)
{
SqlConnection connection = newSqlConnection(connectionString);
connection.Open();
SqlCommand cmd = newSqlCommand(safeSql, connection);
returncmd.ExecuteReader(CommandBehavior.CloseConnection);
}
public static SqlDataReader GetReader(string sql, paramsSqlParameter[] values)
{
SqlConnection connection = newSqlConnection(connectionString);
connection.Open();
SqlCommand cmd = newSqlCommand(sql, connection);
cmd.Parameters.AddRange(values);
returncmd.ExecuteReader(CommandBehavior.CloseConnection);
}
public static DataTable GetDataSet(stringsafeSql)
{
using (SqlConnection connection = newSqlConnection(connectionString))
{
DataSet ds = newDataSet();
SqlCommand cmd = newSqlCommand(safeSql, connection);
SqlDataAdapter da = newSqlDataAdapter(cmd);
da.Fill(ds);
return ds.Tables[0];
}
}
public static DataTable GetDataSet(string sql, paramsSqlParameter[] values)
{
using (SqlConnection connection = newSqlConnection(connectionString))
{
DataSet ds = newDataSet();
SqlCommand cmd = newSqlCommand(sql, connection);
cmd.Parameters.AddRange(values);
SqlDataAdapter da = newSqlDataAdapter(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.