我有一个.sql文件（包含用于创建表和插入数据的SQL语句的文本文件），这些文件显然是从Oracle数据库中转储出来的。
我希望将数据（或至少其中一些）导入MySQL数据库。由于某些特定的数据类型，正常导入不起作用。
我该怎么办？我的猜测：
VARCHAR2？答案 0 :(得分：0)
事实证明，您可以将 Oracle转换为MySQL。这是一个参考页面：Oracle to MySQL Migration - SQLines。
就我而言，我必须将if (ActivityCompat.checkSelfPermission(WebViewActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(WebViewActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(WebViewActivity.this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
MY_PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE);
} else {
downloadFile();
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE:
downloadFile();
break;
}
}
private void downloadFile() {
progressBar.setVisibility(View.VISIBLE);
DownloadFileTask task = new DownloadFileTask(
WebViewActivity.this,
mURL,
"/download/pdf_file.pdf");
task.startTask();
}
@Override
public void onFileDownloaded() {
progressBar.setVisibility(View.GONE);
File file = new File(Environment.getExternalStorageDirectory()
.getAbsolutePath()
+ "/download/pdf_file.pdf");
if (file.exists()) {
pdfView.fromFile(file)
//.pages(0, 2, 1, 3, 3, 3) // all pages are displayed by default
.enableSwipe(true)
.swipeHorizontal(true)
.enableDoubletap(true)
.defaultPage(0)
.enableAnnotationRendering(true)
.password(null)
.scrollHandle(null)
.onLoad(new OnLoadCompleteListener() {
@Override
public void loadComplete(int nbPages) {
pdfView.setMinZoom(1f);
pdfView.setMidZoom(5f);
pdfView.setMaxZoom(10f);
pdfView.zoomTo(2f);
pdfView.scrollTo(100,0);
pdfView.moveTo(0f,0f);
}
})
.load();
}
}
public class DownloadFileTask {
public static final String TAG = "DownloadFileTask";
private BaseActivity context;
private GetTask contentTask;
private String url;
private String fileName;
public DownloadFileTask(BaseActivity context, String url, String fileName) {
this.context = context;
this.url = url;
this.fileName = fileName;
}
public void startTask() {
doRequest();
}
private void doRequest() {
contentTask = new GetTask();
contentTask.execute();
}
private class GetTask extends AsyncTask<String, Integer, String> {
@Override
protected String doInBackground(String... arg0) {
int count;
try {
Log.d(TAG, "url = " + url);
URL _url = new URL(url);
URLConnection conection = _url.openConnection();
conection.connect();
InputStream input = new BufferedInputStream(_url.openStream(),
8192);
OutputStream output = new FileOutputStream(
Environment.getExternalStorageDirectory() + fileName);
byte data[] = new byte[1024];
while ((count = input.read(data)) != -1) {
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
protected void onPostExecute(String data) {
context.onFileDownloaded();
}
}
之类的内容翻译为NUMBER(13,0)和BIGINT至NUMBER(12,2)。
大表中没有明确说明的内容（但在下面提到）是Oracle语法指定varchar大小的单位。所以我将DECIMAL(12,2)翻译为VARCHAR2(4000 BYTE)。
在我的文件中使用了VARCHAR(4000)函数。内置函数表没有说明要做什么，但我将其替换为to_timestamp，因为结果已写入str_to_date字段。
我还有微秒，这些微秒被排除在DATETIME reference on SQLines之外。在一天结束时，to_date变为to_timestamp('01-JAN-00 12.00.13.130000000 AM','DD-MON-RR HH.MI.SSXFF AM')。