//1 首先引入npoi操作的程序集
引用 NPOI.dll Ionic.Zip.dll
using NPOI.SS.UserModel; //包含对excel进行操作的方法
using NPOI.HSSF.UserModel; //包含excel每个sheet的属性
（1）Excel读取数据、Excel写入数据
（2）项目导入、项目导出
1 /// <summary>
2 /// 从Excel读
3 /// </summary>
4 /// <param name="sender"></param>
5 /// <param name="e"></param>
6 private void btnReadFromExcel_Click(object sender, EventArgs e)
7 {
8 //从流stream中读取
9 using(Stream stream=new FileStream("/Files/myexcel.xls",FileMode.Open,FileAccess.Read))
10 {
11 //读取workbook
12 IWorkbook workbook=new HSSFWorkbook(stream);
13 ISheet sheet = workbook.GetSheetAt(0);
14 for (int i = 0; i < sheet.LastRowNum;i++ )
15 {
16 IRow row = sheet.GetRow(i);
17 foreach(ICell cell in row.Cells)
18 {
19 string c = cell.StringCellValue;
20 MessageBox.Show(c);
21 }
22 }
23 }
24 MessageBox.Show("ok,读取成功");
25 }
26
27 /// <summary>
28 /// 写入Excel
29 /// </summary>
30 /// <param name="sender"></param>
31 /// <param name="e"></param>
32 private void btnWriteToExcel_Click(object sender, EventArgs e)
33 {
34 //初始化workbook
35 IWorkbook workbook = new HSSFWorkbook();
36 //创建sheet
37 ISheet sheet = workbook.CreateSheet("班级表");
38 //创建row
39 IRow row = sheet.CreateRow(0);
40 //创建cell
41 ICell cell = row.CreateCell(0);
42 cell.SetCellType(CellType.STRING);
43 cell.SetCellValue("hello");
44 //写入流
45 using(Stream stream=new FileStream("/Files/myexcel2.xls",FileMode.OpenOrCreate,FileAccess.Write))
46 {
47 workbook.Write(stream);
48 }
49 MessageBox.Show("ok,写入成功");
50 }
51
52 /// <summary>
53 /// 导出到Excel
54 /// </summary>
55 /// <param name="sender"></param>
56 /// <param name="e"></param>
57 private void btnExportToExcel_Click(object sender, EventArgs e)
58 {
59 //获得数据表
60 List<Object> list = myORM_BLL.SelectAllModel(typeof(T_CUSTOMER));
61 //初始化workbook
62 IWorkbook workbook = new HSSFWorkbook();
63 //创建sheet
64 ISheet sheet = workbook.CreateSheet("T_CUSTOMER");
65 //遍历数据表 名称用反射获得,数据行直接获得
66 //创建头行headrow
67 IRow headrow = sheet.CreateRow(0);
68 Type type = typeof(T_CUSTOMER);
69 PropertyInfo[] props = type.GetProperties();
70 for(int i=0;i<props.Length; i++)
71 {
72 string propName = props[i].Name;
73 ICell cell = headrow.CreateCell(i);
74 cell.SetCellType(CellType.STRING);
75 cell.SetCellValue(propName);
76 }
77 //创建数据行
78 //遍历集合 每个对象创建一个行
79 for (int j = 0; j < list.Count;j++ )
80 {
81 IRow row = sheet.CreateRow(j + 1);
82 Object obj = list[j];
83 Type tp = obj.GetType();
84 PropertyInfo[] props2 = tp.GetProperties();
85 //对象的每个属性 创建一个Cell
86 for (int k = 0; k < props2.Length;k++ )
87 {
88 string propName2 = props2[k].Name;
89 object propValue2 = props2[k].GetValue(obj);
90 //对于每行创建cell，设置值
91 ICell cell = row.CreateCell(k);
92 cell.SetCellType(CellType.STRING);
93 cell.SetCellValue(propValue2.ToString());
94 }
95 }
96 //写入stream
97 using(Stream stream=new FileStream("/Files/exportdata.xls",FileMode.OpenOrCreate,FileAccess.Write))
98 {
99 workbook.Write(stream);
100 }
101 MessageBox.Show("导出成功");
102 }
103
104 /// <summary>
105 /// 把C#中类型转Excel中类型
106 /// </summary>
107 /// <param name="cTyName">C#中类型 的名称</param>
108 /// <returns>Excel中类型</returns>
109 private CellType CelltypeToCType(string cTyName)
110 {
111 switch (cTyName)
112 {
113 case "Int16":
114 case "Int64":
115 case "Int32": return CellType.NUMERIC;
116 case "String": return CellType.STRING;
117 case "Data":
118 case "DateTime": return CellType.FORMULA;
119 default: throw new Exception("未知类型：" + cTyName);
120 }
121 }
122
123
124 /// <summary>
125 /// 从DB直接导出到Excel
126 /// </summary>
127 /// <param name="sender"></param>
128 /// <param name="e"></param>
129 private void btnExportToExcelFromDB_Click(object sender, EventArgs e)
130 {
131 //初始化workbook，创建sheet
132 IWorkbook workbook = new HSSFWorkbook();
133 ISheet sheet = workbook.CreateSheet("T_CUSTOMER");
134 //打开conn ,发出cmd，reader查询
135 string sql = "SELECT * FROM T_CUSTOMER";
136 using(OracleConnection conn=OracleHelper.CreateConnection())
137 using (OracleCommand cmd = new OracleCommand(sql, conn))
138 using (OracleDataReader reader = cmd.ExecuteReader())
139 {
140 //根据查询字段数fieldcount创建headrow 及遍历字段创建cell
141 IRow headrow = sheet.CreateRow(0);
142 for (int i = 0; i < reader.FieldCount; i++)
143 {
144 ICell cell = headrow.CreateCell(i);
145 cell.SetCellType(CellType.STRING);
146 cell.SetCellValue(reader.GetName(i));
147 }
148 //循环reader查询，每一条查询，创建row 及遍历字段创建cell
149 int datarowIndex = 1; //数据行索引，从1开始
150 while(reader.Read())
151 {
152 IRow row = sheet.CreateRow(datarowIndex);
153 for (int i = 0; i < reader.FieldCount;i++ )
154 {
155 ICell cell = row.CreateCell(i);
156 cell.SetCellType(CellType.STRING);
157 cell.SetCellValue(reader.GetValue(i).ToString());
158 }
159 datarowIndex++;
160 }
161 }
162 //关闭连接
163 //写入stream
164 //写入stream
165 using (Stream stream = new FileStream("/Files/exportdataFromDB.xls", FileMode.OpenOrCreate, FileAccess.Write))
166 {
167 workbook.Write(stream);
168 }
169 MessageBox.Show("导出成功");
170 }
171
172 /// <summary>
173 /// 从Excel导入 OracleBulkCopy大数据导入
174 /// </summary>
175 /// <param name="sender"></param>
176 /// <param name="e"></param>
177 private void btnImportFromExcel_Click(object sender, EventArgs e)
178 {
179 //创建datatable
180 DataTable dt = new DataTable();
181 Type type = typeof(T_CUSTOMER);
182 PropertyInfo[] props = type.GetProperties();
183 DataColumn[] dcArr = new DataColumn[props.Length];
184 int j=0;
185 foreach(PropertyInfo prop in props)
186 {
187 string propName = prop.Name;
188 Type propTy = prop.PropertyType; //属性的类型
189 DataColumn dc = new DataColumn();
190 dc.ColumnName = propName;
191 dcArr[j] = dc; //把表的列 存入数组
192 dc.DataType = propTy; //列中数据的类型
193 dt.Columns.Add(dc);
194 j++;
195 }
196 //读取Excel文件,获得stream
197 using (Stream stream = new FileStream("/Files/exportdata.xls", FileMode.Open, FileAccess.Read))
198 {
199 //获得workbook
200 IWorkbook workbook = new HSSFWorkbook(stream);
201 //读取sheet
202 ISheet sheet = workbook.GetSheetAt(0);
203 //读取row 及行中的cell 放入一个datatable
204 for (int i = 1; i < sheet.LastRowNum;i++ )
205 {
206 IRow row = sheet.GetRow(i);
207 DataRow dr = dt.NewRow();
208 foreach(ICell cell in row.Cells)
209 {
210 if (dcArr[i-1].DataType.Name=="Int32")
211 {
212 dr[dcArr[i - 1]] = (Int32)cell.NumericCellValue; //还可能需 Convert.ToInt32
213 }
214 else if (dcArr[i - 1].DataType.Name == "String")
215 {
216 dr[dcArr[i - 1]] = cell.StringCellValue;
217 }
218 else if (dcArr[i - 1].DataType.Name == "DateTime?")
219 {
220 dr[dcArr[i - 1]] = (DateTime?)cell.DateCellValue;
221 }
222 else
223 {
224 throw new Exception("未知类型:" + cell.CellType);
225 }
226 }
227 dt.Rows.Add(dr); //把表的行加入表的行集合中,最终获得表
228 }
229 }
230 //OracleBulk
231 using (OracleBulkCopy bulkCopy = new OracleBulkCopy(OracleHelper.CreateConnection()))
232 {
233 bulkCopy.DestinationTableName = "T_CUSTOMER";
234 foreach (DataColumn dc in dcArr)
235 {
236 string columnName = dc.ColumnName;
237 bulkCopy.ColumnMappings.Add(columnName, columnName);
238 }
239 bulkCopy.WriteToServer(dt);
240 }
241 //把数据表插入DB
242 }
243
244
245 /// <summary>
246 /// 从Execel直接导入DB
247 /// </summary>
248 /// <param name="sender"></param>
249 /// <param name="e"></param>
250 private void btnImportToDBFromExcel_Click(object sender, EventArgs e)
251 {
252 //读取excel
253 using (Stream stream = new FileStream("/Files/exportdataFromDB.xls", FileMode.Open, FileAccess.Read))
254 {
255 IWorkbook workbook = new HSSFWorkbook(stream);
256 //获得sheet
257 ISheet sheet = workbook.GetSheetAt(0);
258
259 //行headrow 去除首行 获得含有‘:‘列名数组
260 IRow headrow = sheet.GetRow(0);
261 string[] columnNameArr = new string[headrow.LastCellNum-1];
262 for (int i = 1; i < headrow.LastCellNum;i++ )
263 {
264 columnNameArr[i - 1] = ":" + headrow.Cells[i].StringCellValue;
265 }
266 StringBuilder sb=new StringBuilder();
267 sb.Append("INSERT INTO T_CUSTOMER VALUES(SE_T_CUSTOMER.NEXTVAL,").Append(string.Join(",",columnNameArr)).AppendLine(")");
268 //遍历行row 去除首行 获得参数数组
269 for (int j = 1; j < sheet.LastRowNum;j++ )
270 {
271 IRow row = sheet.GetRow(j);
272 //除0行 的每一行都有一个参数数组，里面有各个cell值的参数
273 //声明一个参数数组，并对其中的灭一个参数赋值
274 OracleParameter[] paraArr = new OracleParameter[row.LastCellNum - 1]; { for (int i = 0; i < paraArr.Length;i++ ) { paraArr[i] = new OracleParameter(); } }
275 for (int k = 1; k < row.LastCellNum; k++)
276 {
277 ICell cell = row.Cells[k];
278 paraArr[k - 1].ParameterName = columnNameArr[k - 1];
279 paraArr[k - 1].Value = (object)cell.StringCellValue; //判断 不需要
280 }
281 //除0每一行 都执 /插入DB
282 OracleHelper.ExecuteNonQuery(sb.ToString(), paraArr);
283 }
284 }
285 }
时间： 2024-11-06 20:59:08