IO流实现表结构的导入导出
时间: 2024-03-06 08:47:27 浏览: 28
表结构的导入导出可以通过IO流实现。具体步骤如下:
1.导出表结构:将表结构信息写入到文件中。
```
//获取数据库连接
Connection conn = DriverManager.getConnection(url, user, password);
//获取表结构信息
DatabaseMetaData meta = conn.getMetaData();
ResultSet rs = meta.getColumns(null, null, tableName, null);
//创建输出流
OutputStream os = new FileOutputStream(filePath);
//写入表名
os.write(tableName.getBytes());
os.write("\r\n".getBytes());
//写入表结构信息
while(rs.next()){
String columnName = rs.getString("COLUMN_NAME");
String columnTypeName = rs.getString("TYPE_NAME");
int columnSize = rs.getInt("COLUMN_SIZE");
String remarks = rs.getString("REMARKS");
String line = columnName + "," + columnTypeName + "," + columnSize + "," + remarks;
os.write(line.getBytes());
os.write("\r\n".getBytes());
}
//关闭连接和输出流
rs.close();
conn.close();
os.close();
```
2.导入表结构:从文件中读取表结构信息,并根据信息创建表结构。
```
//获取数据库连接
Connection conn = DriverManager.getConnection(url, user, password);
//创建输入流
InputStream is = new FileInputStream(filePath);
//读取表名
byte[] bytes = new byte[1024];
is.read(bytes);
String tableName = new String(bytes).trim();
//读取表结构信息
List<String> lines = new ArrayList<>();
while(is.read(bytes) != -1){
String line = new String(bytes).trim();
lines.add(line);
}
//创建表结构
Statement stmt = conn.createStatement();
String sql = "CREATE TABLE " + tableName + "(";
for(String line : lines){
String[] columns = line.split(",");
String columnName = columns[0];
String columnTypeName = columns[1];
int columnSize = Integer.parseInt(columns[2]);
String remarks = columns[3];
sql += columnName + " " + columnTypeName + "(" + columnSize + ") COMMENT '" + remarks + "',";
}
sql = sql.substring(0, sql.length() - 1) + ")";
stmt.execute(sql);
//关闭连接和输入流
stmt.close();
conn.close();
is.close();
```