EF 实现自定义数据库字符串
作者:互联网
1、EF模板生成继承DbContext的类文件重新建一个部分类文件
避免每次生成实体都会覆盖掉。
2、重新构造调用数据库连接字符串的函数
VS模板生成示例:
public Test_DBEntities()
: base("name=Test_DBEntities")
{
}
重写函数
public Test_DBEntities(string connectionString)
: base(connectionString)
{
}
3、自定义EF数据库字符串函数(SQLServer)
public static string GetConnection()
{
string DataSource = ".";
string DataBase = "DB;
string UserId = "sa";
string PassWord = "sa";
SqlConnectionStringBuilder sqlBuilder = new SqlConnectionStringBuilder();
sqlBuilder.DataSource = DataSource;
sqlBuilder.InitialCatalog = DataBase;
sqlBuilder.PersistSecurityInfo = true;
sqlBuilder.IntegratedSecurity = true;
sqlBuilder.MultipleActiveResultSets = true;
sqlBuilder.UserID = UserId;
sqlBuilder.Password = PassWord;
EntityConnectionStringBuilder entityBuilder = new EntityConnectionStringBuilder();
entityBuilder.ProviderConnectionString = sqlBuilder.ToString();
entityBuilder.Metadata = "res://*/";
entityBuilder.Provider = "System.Data.SqlClient";
return entityBuilder.ToString();
}
4、调用示例
string definestr = "";//自定义数据库查询结果
string str = "";
using (var db = new Test_DBEntities())
{
var list = db.T_User.Select(m=>m.name).ToList();
str= string.Join(",", list);
}
using (var db = new Test_DBEntities(ConnectionHelper.GetConnection()))
{
var list = db.T_User.Select(m => m.name).ToList();
definestr = string.Join(",", list);
}
标签:sqlBuilder,string,自定义,数据库,EF,db,entityBuilder,Test,DBEntities 来源: https://blog.51cto.com/u_11205641/2829705