android 数据库流程分析

gpephone

数据库流程分析
通过intent 添加或者编辑contact
intent = new Intent(Intent.ACTION_INSERT, People.CONTENT_URI);
intent = new Intent(Intent.ACTION_EDIT,
                        ContentUris.withAppendedId(People.CONTENT_URI, id));
intent.setFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
startActivity(intent);                        
EditContactActivity.java (packages\apps\contacts\src\com\android\contacts)
protected void onCreate(Bundle icicle)
  buildEntriesForInsert(getIntent().getExtras());
  
   doSaveAction
     save()
       mResolver.insert(entry.uri, values);
EditContactActivity.java (packages\apps\contacts\src\com\android\contacts)文件类
public final class EditContactActivity extends Activity implements View.OnClickListener,
        TextWatcher, View.OnFocusChangeListener 中有：
ContentResolver mResolver;
public abstract class ContentResolver
public final Uri insert(Uri url, ContentValues values)
  IContentProvider provider = acquireProvider(url);
  return provider.insert(url, values);
调用：
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public abstract class ContentProvider implements ComponentCallbacks
  class Transport extends ContentProviderNative
    public Uri insert(Uri uri, ContentValues initialValues)
      return ContentProvider.this.insert(uri, initialValues)
    public int bulkInsert(Uri uri, ContentValues[] initialValues)
      return ContentProvider.this.insert(uri, initialValues)
  public int bulkInsert(Uri uri, ContentValues[] initialValues)
public abstract class SyncableContentProvider extends ContentProvider
public abstract class AbstractSyncableContentProvider extends SyncableContentProvider
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  public final Uri insert(final Uri url, final ContentValues values)
    result = insertInternal(uri, values);
  public final int bulkInsert(final Uri uri, final ContentValues[] values)
    Uri result = insertInternal(url, values);
因为：
public class ContactsProvider extends AbstractSyncableContentProvider
所以：
Uri result = insertInternal(url, values);执行的是 ContactsProvider 类中的
public Uri insertInternal(Uri url, ContentValues initialValues)函数
  final SQLiteDatabase db = getDatabase();
  int match = sURIMatcher.match(url);
  switch(match)
  case PEOPLE_OWNER:
    return insertOwner(initialValues);
  case PEOPLE_RAW:
  case PEOPLE:
    rowID = mPeopleInserter.insert(mValues);
因为 ContactsProvider 类中有：
private DatabaseUtils.InsertHelper mPeopleInserter;
public class DatabaseUtils
  public static class InsertHelper
    public long insert(ContentValues values)
      private synchronized long insertInternal(ContentValues values, boolean allowReplace)
        QLiteStatement stmt = getStatement(allowReplace);
        return stmt.executeInsert();
          native_execute();
本地调用：
android_database_SQLiteStatement.cpp (frameworks\base\core\jni)
static void native_execSQL(JNIEnv* env, jobject object, jstring sqlString)
  jchar const * sql = env->GetStringChars(sqlString, NULL);
  jsize sqlLen = env->GetStringLength(sqlString);
  err = sqlite3_prepare16_v2(handle, sql, sqlLen * 2, &statement, NULL);
完成数据库操作。
public class CalendarProvider extends AbstractSyncableContentProvider

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u1/49742/showart_1923918.html