public static void export() throws Exception{
//声明需要导出的数据库
String dbName = "hdcloude";
//声明book
HSSFWorkbook book = new HSSFWorkbook();
//获取Connection,获取db的元数据
//Connection con = DataSourceUtils.getConn();
Connection con =DriverManager.getConnection("jdbc:MySQL://127.0.0.1:3306", "root", "root");
//声明statemen
Statement st = con.createStatement();
//st.execute("use "+dbName);
DatabaseMetaData dmd = con.getMetaData();
//获取数据库有多少表
ResultSet rs = dmd.getTables(dbName,dbName,null,new String[]{"TABLE"});
//获取所有表名 - 就是一个sheet
List<String> tables = new ArrayList<String>();
while(rs.next()){
String tableName = rs.getString("TABLE_NAME");
System.out.println(tableName);
tables.add(tableName);
}
for(String tableName:tables){
HSSFSheet sheet = book.createSheet(tableName);
//声明sql
String sql = "select * from "+dbName+"."+tableName;
//查询数据
rs = st.executeQuery(sql);
//根据查询的结果,分析结果集的元数据
ResultSetMetaData rsmd = rs.getMetaData();
//获取这个查询有多少行
int cols = rsmd.getColumnCount();
//获取所有列名
//创建第一行
HSSFRow row = sheet.createRow(0);
for(int i=0;i<cols;i++){
String colName = rsmd.getColumnName(i+1);
//创建一个新的列
HSSFCell cell = row.createCell(i);
//写入列名
cell.setCellValue(colName);
}
//遍历数据
int index = 1;
while(rs.next()){
row = sheet.createRow(index++);
//声明列
for(int i=0;i<cols;i++){
String val = rs.getString(i+1);
//声明列
HSSFCell cel = row.createCell(i);
//放数据
cel.setCellValue(val);
}
}
}
con.close();
book.write(new FileOutputStream("\\"+dbName+".xls"));
}