public partial class ExcelHelper : IDisposable
{
#region Fileds
private string _excelObject = "Provider=Microsoft.{0}.OLEDB.{1};Data Source={2};Extended Properties=\"Excel {3};HDR={4};IMEX={5}\"";
private string _filepath = string.Empty;
private string _hdr = "No";
private string _imex = "1";
private OleDbConnection _con = null;
#endregion
#region Ctor
public ExcelHelper(string filePath)
{
this._filepath = filePath;
}
#endregion
#region Properties
/// <summary>
/// 獲取連接字符串
/// </summary>
public string ConnectionString
{
get
{
string result = string.Empty;
if (String.IsNullOrEmpty(this._filepath))
return result;
//檢查文件格式
FileInfo fi = new FileInfo(this._filepath);
if (fi.Extension.Equals(".xls"))
{
result = string.Format(this._excelObject, "Jet", "4.0", this._filepath, "8.0", this._hdr, this._imex);
}
else if (fi.Extension.Equals(".xlsx"))
{
result = string.Format(this._excelObject, "Ace", "12.0", this._filepath, "12.0", this._hdr, this._imex);
}
return result;
}
}
/// <summary>
/// 獲取連接
/// </summary>
public OleDbConnection Connection
{
get
{
if (_con == null)
{
this._con = new OleDbConnection();
this._con.ConnectionString = this.ConnectionString;
}
return this._con;
}
}
/// <summary>
/// HDR
/// </summary>
public string Hdr
{
get { return this._hdr; }
set { this._hdr = value; }
}
/// <summary>
/// IMEX
/// </summary>
public string Imex
{
get { return this._imex; }
set { this._imex = value; }
}
#endregion
#region Methods
/// <summary>
/// Gets a schema
/// </summary>
/// <returns>Schema</returns>
public DataTable GetSchema()
{
DataTable dtSchema = null;
if (this.Connection.State != ConnectionState.Open) this.Connection.Open();
dtSchema = this.Connection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
return dtSchema;
}
private string GetTableName()
{
string tableName = string.Empty;
DataTable dt = GetSchema();
for (int i = 0; i < dt.Rows.Count; i++)
{
tableName += dt.Rows[i][2].ToString().Trim();
}
return tableName.Substring(0, tableName.Length - 1);
}
public DataTable ReadTable()
{
return this.ReadTable(GetTableName(), ExcelHelperReadTableMode.ReadFromWorkSheet);
}
/// <summary>
/// Read all table rows
/// </summary>
/// <param name="tableName">Table Name</param>
/// <returns>Table</returns>
public DataTable ReadTable(string tableName)
{
return this.ReadTable(tableName, ExcelHelperReadTableMode.ReadFromWorkSheet);
}
/// <summary>
/// Read table
/// </summary>
/// <param name="tableName">Table Name</param>
/// <param name="mode">Read mode</param>
/// <returns>Table</returns>
public DataTable ReadTable(string tableName, ExcelHelperReadTableMode mode)
{
return this.ReadTable(tableName, mode, "");
}
/// <summary>
/// Read table
/// </summary>
/// <param name="tableName">Table Name</param>
/// <param name="mode">Read mode</param>
/// <param name="criteria">Criteria</param>
/// <returns>Table</returns>
public DataTable ReadTable(string tableName, ExcelHelperReadTableMode mode, string criteria)
{
if (this.Connection.State != ConnectionState.Open)
{
this.Connection.Open();
}
string cmdText = "Select * From [{0}]";
if (!string.IsNullOrEmpty(criteria))
{
cmdText += " Where " + criteria;
}
string tableNameSuffix = string.Empty;
if (mode == ExcelHelperReadTableMode.ReadFromWorkSheet)
tableNameSuffix = "$";
OleDbCommand cmd = new OleDbCommand(string.Format(cmdText, tableName + tableNameSuffix));
cmd.Connection = this.Connection;
OleDbDataAdapter adpt = new OleDbDataAdapter(cmd);
DataSet ds = new DataSet();
adpt.Fill(ds, tableName);
if (ds.Tables.Count >= 1)
{
return ds.Tables[0];
}
else
{
return null;
}
}

/// <summary>
/// Drop table
/// </summary>
/// <param name="tableName">Table Name</param>
public void DropTable(string tableName)
{
if (this.Connection.State != ConnectionState.Open)
{
this.Connection.Open();
}
string cmdText = "Drop Table [{0}]";
using (OleDbCommand cmd = new OleDbCommand(string.Format(cmdText, tableName), this.Connection))
{
cmd.ExecuteNonQuery();
}
this.Connection.Close();
}
/// <summary>
/// Write table
/// </summary>
/// <param name="tableName">Table Name</param>
/// <param name="tableDefinition">Table Definition</param>
public void WriteTable(string tableName, Dictionary<string, string> tableDefinition)
{
using (OleDbCommand cmd = new OleDbCommand(this.GenerateCreateTable(tableName, tableDefinition), this.Connection))
{
if (this.Connection.State != ConnectionState.Open) this.Connection.Open();
cmd.ExecuteNonQuery();
}
}
/// <summary>
/// Add new row
/// </summary>
/// <param name="dr">Data Row</param>
public void AddNewRow(DataRow dr)
{
string command = this.GenerateInsertStatement(dr);
ExecuteCommand(command);
}
/// <summary>
/// Execute new command
/// </summary>
/// <param name="command">Command</param>
public void ExecuteCommand(string command)
{
using (OleDbCommand cmd = new OleDbCommand(command, this.Connection))
{
if (this.Connection.State != ConnectionState.Open) this.Connection.Open();
cmd.ExecuteNonQuery();
}
}
/// <summary>
/// Generates create table script
/// </summary>
/// <param name="tableName">Table Name</param>
/// <param name="tableDefinition">Table Definition</param>
/// <returns>Create table script</returns>
private string GenerateCreateTable(string tableName, Dictionary<string, string> tableDefinition)
{
StringBuilder sb = new StringBuilder();
bool firstcol = true;
sb.AppendFormat("CREATE TABLE [{0}](", tableName);
firstcol = true;
foreach (KeyValuePair<string, string> keyvalue in tableDefinition)
{
if (!firstcol)
{
sb.Append(",");
}
firstcol = false;
sb.AppendFormat("{0} {1}", keyvalue.Key, keyvalue.Value);
}
sb.Append(")");
return sb.ToString();
}
/// <summary>
/// Generates insert statement script
/// </summary>
/// <param name="dr">Data row</param>
/// <returns>Insert statement script</returns>
private string GenerateInsertStatement(DataRow dr)
{
StringBuilder sb = new StringBuilder();
bool firstcol = true;
sb.AppendFormat("INSERT INTO [{0}](", dr.Table.TableName);

foreach (DataColumn dc in dr.Table.Columns)
{
if (!firstcol)
{
sb.Append(",");
}
firstcol = false;
sb.Append(dc.Caption);
}
sb.Append(") VALUES(");
firstcol = true;
for (int i = 0; i <= dr.Table.Columns.Count - 1; i++)
{
if (!object.ReferenceEquals(dr.Table.Columns[i].DataType, typeof(int)))
{
sb.Append("'");
sb.Append(dr[i].ToString().Replace("'", "''"));
sb.Append("'");
}
else
{
sb.Append(dr[i].ToString().Replace("'", "''"));
}
if (i != dr.Table.Columns.Count - 1)
{
sb.Append(",");
}
}
sb.Append(")");
return sb.ToString();
}
/// <summary>
/// Dispose [實現(xiàn)IDispose接口]
/// </summary>
public void Dispose()
{
if (this._con != null && this._con.State == ConnectionState.Open)
this._con.Close();
if (this._con != null)
this._con.Dispose();
this._con = null;
this._filepath = string.Empty;
}
#endregion
}