C#显示DataTable指定行的记录属性值_编程语言综合
C#显示指定行的记录属性值，用DataTable中的NewRow()方法生成新的DataRow， 对新的DataRow的DataColumn对象设置数值，将新的DataRow加进DataTable中，创建DataSet 并调用mySqlDataAdapter的fill方法，从myDataSet中获取Customers表，具体代码如下：
view sourceprint?01using System;
02using System.Data;
03using System.Data.SqlClient;
04namespace ModifyDatabase
05{
06 public class ModifyDatabase
07 {
08 // 显示指定行的记录属性值
09 public static void DisplayDataRow(
10 DataRow myDataRow,
11 DataTable myDataTable
12 )
13 {
14 Console.WriteLine("/nIn DisplayDataRow()");
15 foreach (DataColumn myDataColumn in myDataTable.Columns)
16 {
17 Console.WriteLine(myDataColumn + " = " +
18 myDataRow[myDataColumn]);
19 }
20 }
21 public static void AddDataRow(
22 DataTable myDataTable,
23 SqlDataAdapter mySqlDataAdapter,
24 SqlConnection mySqlConnection
25 )
26 {
27 Console.WriteLine("/nIn AddDataRow()");
28 // 用DataTable中的NewRow()方法生成新的DataRow
29 Console.WriteLine("Calling myDataTable.NewRow()");
30 DataRow myNewDataRow = myDataTable.NewRow();
31 Console.WriteLine("myNewDataRow.RowState = " +
32 myNewDataRow.RowState);
33 // 对新的DataRow的DataColumn对象设置数值
34 myNewDataRow["CustomerID"] = "JxCOM";
35 myNewDataRow["CompanyName"] = "Jx Company";
36 myNewDataRow["Address"] = "1 Main Street";
37 // 将新的DataRow加进DataTable中
38 Console.WriteLine("Calling myDataTable.Rows.Add()");
39 myDataTable.Rows.Add(myNewDataRow);
40 Console.WriteLine("myNewDataRow.RowState = " +
41 myNewDataRow.RowState);
42 // 将新行推进数据库中
43 Console.WriteLine("Calling mySqlDataAdapter.Update()");
44 mySqlConnection.Open();
45 int numOfRows = mySqlDataAdapter.Update(myDataTable);
46 mySqlConnection.Close();
47 Console.WriteLine("numOfRows = " + numOfRows);
48 Console.WriteLine("myNewDataRow.RowState = " +
49 myNewDataRow.RowState);
50 DisplayDataRow(myNewDataRow, myDataTable);
51 }
52 public static void Main()
53 {
54 SqlConnection mySqlConnection =
55 new SqlConnection(
56 "server=localhost;database=Northwind;uid=sa;pwd=sa"
57 );
58 // 创建SELECT语句得SqlCommand对象
59 SqlCommand mySelectCommand = mySqlConnection.CreateCommand();
60 mySelectCommand.CommandText =
61 "SELECT CustomerID, CompanyName, Address " +
62 "FROM Customers " +
63 "ORDER BY CustomerID";
64 // 创建INSERT语句得SqlCommand对象
65 SqlCommand myInsertCommand = mySqlConnection.CreateCommand();
66 myInsertCommand.CommandText =
67 "INSERT INTO Customers (" +
68 " CustomerID, CompanyName, Address" +
69 ") VALUES (" +
70 " @CustomerID, @CompanyName, @Address" +
71 ")";
72 myInsertCommand.Parameters.Add("@CustomerID", SqlDbType.NChar,
73 5, "CustomerID");
74 myInsertCommand.Parameters.Add("@CompanyName", SqlDbType.NVarChar,
75 40, "CompanyName");
76 myInsertCommand.Parameters.Add("@Address", SqlDbType.NVarChar,
77 60, "Address");
78 // 创建SqlDataAdapter并设置相应属性
79 SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
80 mySqlDataAdapter.SelectCommand = mySelectCommand;
81 mySqlDataAdapter.InsertCommand = myInsertCommand;
82 // 创建DataSet 并调用mySqlDataAdapter的fill方法
83 DataSet myDataSet = new DataSet();
84 Console.WriteLine("Calling mySqlDataAdapter.Fill()");
85 mySqlConnection.Open();
86 int numOfRows =
87 mySqlDataAdapter.Fill(myDataSet, "Customers");
88 mySqlConnection.Close();
89 Console.WriteLine("numOfRows = " + numOfRows);
90 // 从myDataSet中获取Customers表
91 DataTable customersDataTable = myDataSet.Tables["Customers"];
92 // 在Customers表中添加新行
93 AddDataRow(customersDataTable, mySqlDataAdapter,
94 mySqlConnection);
95 }
96 }
97}
