有三种方法可以批量向数据库插入数据,利用dataset,利用事务,使用数据库中的Table类型变量实现数据插入
这种方法的前提是数据库中必须支持Table类型的变量
一、利用事务(transaction)
‘定义执行批量插入数据的函数,参数为insert SQL语句的数组
sub ExeTransaction (Byval Sqlstrlist as string())
dim Conn As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Tax.mdb"
dim trans as OledbTransaction=Nothing
try
if conn.State=connectionstate.closed then
conn.open()
end if
dim cmd as oledbCommand=new oledbcommand()
cmd.connection=conn
cmd.commandtype=commandtype.text
trans=conn.begintransaction()
cmd.transaction=trans
dim I as integer
for I=0 to Sqlstrlist.GetupperBound(0)
cmd.commandtext= Sqlstrlist(i) ‘取得参数(数组)中的值
cmd.executenonquery()
next
trans.commit()
catch ex as oledbexception
trans.rollback()
fanlly
conn.close()
end try
end sub
方式二:使用数据库中的Table类型变量实现数据插入
这种方法的前提是数据库中必须支持Table类型的变量。
--创建自定义表变量
Create Type PassportTableType as Table(columns.... nvarchar(50))
--创建存储过程
Create PROCEDURE [dbo].[CreatePassportWithTVP]
@TVP PassportTableType readonly
AS
BEGIN
SET NOCOUNT ON;
Insert into Passport(PassportKey) select PassportKey from @TVP
END
--在程序中调用
SqlParameter[] sqlParameter = { new SqlParameter("@TVP", dataTable) };
SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, "CreatePassportWithTVP", sqlParameter);
方式二:使用SqlBulkCopy
使用SqlBulkCopy类进行数据插入其原理是采用了SQL Server的BCP协议进行数据的批量复制,使用这个有点要注意的地方,就是数据源表中的列和目标表中的列一一对应
///
/// 批量插入数据
///
/// 目标表
/// 数据源表
/// 链接字符串
///
public static bool SqlBulkCopyInsert(string DestinationTableName, DataTable dt,string connectionString)
{
using (SqlBulkCopy sqlBulkCopy = new SqlBulkCopy(connectionString))
{
try
{
sqlBulkCopy.DestinationTableName = DestinationTableName;
sqlBulkCopy.BatchSize = dt.Rows.Count;
SqlConnection sqlConnection = new SqlConnection(connectionString);
sqlConnection.Open();
if (dt != null && dt.Rows.Count != 0)
{
sqlBulkCopy.WriteToServer(dt);
}
sqlBulkCopy.Close();
sqlConnection.Close();
}
catch
{
return false;
}
}
return true;
}
下面是想写成泛型的,这是个半成品还没有想好怎样实现通用性会更好
///
///
///
///
///
///
///
///
///
public static bool SqlBulkCopyInsert
{
using (SqlBulkCopy sqlBulkCopy = new SqlBulkCopy(WebConfig.AutoSiteV2String))
{
try
{
DataTable dataTable = BaseDalc.GetTableSchema(DataColumnName);
foreach (KeyValuePair
{
DataRow dataRow = dataTable.NewRow();
dataRow.ItemArray = new object[] { keyValuePair.Key, keyValuePair.Value };
dataTable.Rows.Add(dataRow);
}
sqlBulkCopy.DestinationTableName = DestinationTableName;
sqlBulkCopy.BatchSize = dataTable.Rows.Count;
SqlConnection sqlConnection = new SqlConnection(WebConfig.AutoSiteV2String);
sqlConnection.Open();
if (dataTable != null && dataTable.Rows.Count != 0)
{
sqlBulkCopy.WriteToServer(dataTable, DataRowState.Detached);
}
sqlBulkCopy.Close();
sqlConnection.Close();
}
catch
{
return false;
}
}
return true;
}
三、利用dataset
public sub Insert()
‘建立datatable数据源
dim dt as DataTable=New DataTable()
dim dr as DataRow
dt.columns.add(new DataColumn(“name”))
dim j as Integer
for j =0 to 10
dr=dt.newrow()
dr(0)=”name”+j.tostring
dt.rows.add(dr)
next
dim Conn As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Tax.mdb"
conn.open()
dim MyAdapter as Oledbdataadapter=new OleDataAdapter()
….
dim cmd as Oledbcommand=New Oledbcommand(“Insert Into table(name) values (@name)”,conn)
cmd.parameters.item(“@name”).SourceColumns=dt.columns(“name”).columnsName
myadapter.update(dt)
conn.close()
end sub
利用以上的三种方法,都可以完成向数据库批量插入数据。