#创建SQL Server数据库浅析 枫

　C#创 建SQL Server数据库

　　在创建了数据库连接对象后，我们就可以在程序中运用它了。首先，我们在程序中动态地C#创建SQL Server数据库。我们将数据库创建在C:\mysql目录下，所以读者要练习该实例的话得先在C:下创建一个名为mysql的文件夹，否则会出错！创 建数据库的关键是函数中的sql对象，通过该对象我们指定了数据库文件的一些基本属性。之后，我们新创建了一个SqlCommand对象，通过该对象我们 就实际完成了对数据库的操作。函数的实现如下：

private void button1_Click(object sender, System.EventArgs e)

{

// 打开数据库连接

if( conn.State != ConnectionState.Open)  conn.Open();

string sql = "CREATE DATABASE mydb ON PRIMARY" +"(name=test_data,

filename =  'C:\\mysql\\mydb_data.mdf', size=3,"  +"maxsize=5,

filegrowth=10%)log on"  +"(name=mydbb_log,

filename='C:\\mysql\\mydb_log.ldf',size=3,"  +"maxsize=20,filegrowth=1)";

cmd = new SqlCommand(sql, conn);

try

{

cmd.ExecuteNonQuery();

}

catch(SqlException ae)

{

MessageBox.Show(ae.Message.ToString());

}

}

　　创建了数据库后，我们得为其创建表，表是数据库中的基本对象。我们通过CREATE TABLE这句SQL语句完成创建表的操作，表被创建后，我们就确定了其模式（Schema）。之后，我们还通过INSERT语句向该表中添加了四条记录 以为后用。函数的实现如下：

private void button2_Click(object sender, System.EventArgs e)

{

// 打开数据库连接

if( conn.State == ConnectionState.Open)  conn.Close();

ConnectionString ="Integrated Security=SSPI;" +  "Initial Catalog=mydb;" +  "Data Source=localhost;";

conn.ConnectionString = ConnectionString;

conn.Open();

sql = "CREATE TABLE myTable"+  "(myId INTEGER CONSTRAINT PKeyMyId PRIMARY KEY,"+  "myName CHAR(50),

myAddress CHAR(255), myBalance  FLOAT)";

cmd = new SqlCommand(sql, conn);

try

{

cmd.ExecuteNonQuery();

// 向表中添加记录

sql = "INSERT INTO myTable(myId, myName,  myAddress, myBalance) "+  "VALUES (1001, 'Puneet Nehra', 'A 449 Sect 19, DELHI', 23.98 ) " ;

cmd = new SqlCommand(sql, conn);

cmd.ExecuteNonQuery();

sql = "INSERT INTO myTable(myId, myName,myAddress, myBalance) "+  "VALUES (1002, 'Anoop Singh', 'Lodi Road, DELHI', 353.64) " ;

cmd = new SqlCommand(sql, conn);

cmd.ExecuteNonQuery();

sql = "INSERT INTO myTable(myId, myName, myAddress, myBalance) "+  "VALUES (1003, 'Rakesh M', 'Nag Chowk, Jabalpur M.P.', 43.43) " ;

cmd = new SqlCommand(sql, conn);

cmd.ExecuteNonQuery();

sql = "INSERT INTO myTable(myId, myName, myAddress, myBalance) "+  "VALUES (1004, 'Madan Kesh', '4th Street, Lane 3, DELHI', 23.00) " ;

cmd = new SqlCommand(sql, conn);

cmd.ExecuteNonQuery();

}

catch(SqlException ae)

{

MessageBox.Show(ae.Message.ToString());

}

}