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<1>c#创建数据库表: private void CreatTable(string name) //创建数据库源数据表,name为表名 { con.ConnectionString = s; con.Open(); string sql = "CREATE TABLE " + name + "(Line INTEGER, FH1 nchar(8),FH2 nchar(8),"; sql += " FH3 nchar(8),FH4 nchar(8),FH5 nchar(8),FH6 nchar(8),FH7 nchar(8))"; sql += "primary key(Line),foreign key(Line) references 患者信息(编号))"; //设置外键约束 SqlCommand cmd = new SqlCommand(sql, con); cmd.ExecuteNonQuery(); con.Close(); } <2>C# 更新数据库表 con = new SqlConnection(s); con.Open(); string sqlstr = "update 系统参数 set 内容='" + content + "' where 类型='" + type + "'" + "and 名称='" + name + "'"; ; //单引号,然后是双引号 cmd = new SqlCommand(sqlstr, con); cmd.ExecuteNonQuery(); con.Close(); <3>C#创建数据库代码 string Connectionstr = "Data Source=A3135;Initial Catalog=;Integrated Security=True"; string sqlstr = "select count(*) from sys.databases where name='病历管理系统数据库'"; SqlConnection con = new SqlConnection(); con.ConnectionString = Connectionstr; con.Open(); SqlCommand cmd = new SqlCommand(sqlstr, con); //判断当前数据库是否存在 int flag = int.Parse(cmd.ExecuteScalar().ToString()); //flag>0则存在,flag<=0则不存在 con.Close(); if (flag <= 0) { con.Open(); sqlstr = "create database 病历管理系统数据库 on(name=病历管理统数据库_data," + "filename='C:\\Program Files\\Microsoft SQL Server\\MSSQL10_50.MSSQLSERVER\\MSSQL\\DATA\\病历管理系统数据库.mdf'" + ",size=3,maxsize=20,filegrowth=1)log on(name=病历管理系统数据库_log,filename= 'C:\\Program Files\\Microsoft SQL Server\\MSSQL10_50.MSSQLSERVER\\MSSQL\\DATA\\病历管理系统数据库.ldf'" + ",size=3,maxsize=20,filegrowth=1)"; SqlCommand cmd1 = new SqlCommand(sqlstr, con); //创建数据库 cmd1.ExecuteNonQuery(); con.Close(); } <4>C# 查询字符串是否含有str字符 sqlstr += " select * from TableName where 姓名 like '%" + str + "%'"; <5>C# 获取本机局域网内所有数据库的名字: private List<string> GetSqlServerName() { DataTable dataSources = SqlClientFactory.Instance.CreateDataSourceEnumerator().GetDataSources(); DataColumn column = dataSources.Columns["InstanceName"]; DataColumn column2 = dataSources.Columns["ServerName"]; DataRowCollection rows = dataSources.Rows; List<string> Serverlist = new List<string>(); string array = string.Empty; for (int i = 0; i < rows.Count; i++) { string str2 = rows[i][column2] as string; string str = rows[i][column] as string; if (((str == null) || (str.Length == 0)) || (str == "MSSQLSERVER")) { array = str2; } else { array = str2 + @"\" + str; } Serverlist.Add(array); } Serverlist.Sort(); return Serverlist; } |
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