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gtask/data/SqlData.java注释

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何思源 3 months ago
parent 5049d363a1
commit 3fe36107b5
1 changed files with 61 additions and 49 deletions
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app/src/main/java/net/micode/notes/gtask/data/SqlData.java
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@ -35,75 +35,75 @@ import org.json.JSONException;
import org.json.JSONObject;
// 数据库数据操作类，处理GTask相关数据的SQL操作
public class SqlData {
// 日志标签，使用类名
private static final String TAG = SqlData.class.getSimpleName();
// 无效ID常量
private static final int INVALID_ID = -99999;
// 数据查询投影数组，定义查询返回的列
public static final String[] PROJECTION_DATA = new String[] {
DataColumns.ID, DataColumns.MIME_TYPE, DataColumns.CONTENT, DataColumns.DATA1,
DataColumns.DATA3
};
public static final int DATA_ID_COLUMN = 0;
public static final int DATA_MIME_TYPE_COLUMN = 1;
public static final int DATA_CONTENT_COLUMN = 2;
public static final int DATA_CONTENT_DATA_1_COLUMN = 3;
public static final int DATA_CONTENT_DATA_3_COLUMN = 4;
private ContentResolver mContentResolver;
private boolean mIsCreate;
private long mDataId;
private String mDataMimeType;
private String mDataContent;
private long mDataContentData1;
private String mDataContentData3;
private ContentValues mDiffDataValues;
// 投影数组中各列的索引
public static final int DATA_ID_COLUMN = 0; // ID列索引
public static final int DATA_MIME_TYPE_COLUMN = 1; // MIME类型列索引
public static final int DATA_CONTENT_COLUMN = 2; // 内容列索引
public static final int DATA_CONTENT_DATA_1_COLUMN = 3;// 数据1列索引
public static final int DATA_CONTENT_DATA_3_COLUMN = 4;// 数据3列索引
// 成员变量
private ContentResolver mContentResolver; // 内容解析器，用于操作ContentProvider
private boolean mIsCreate; // 标记是否为新建数据
private long mDataId; // 数据ID
private String mDataMimeType; // 数据MIME类型
private String mDataContent; // 数据内容
private long mDataContentData1; // 数据1
private String mDataContentData3; // 数据3
private ContentValues mDiffDataValues; // 变更的数据值
// 构造方法，初始化数据对象
public SqlData(Context context) {
mContentResolver = context.getContentResolver();
mIsCreate = true;
mDataId = INVALID_ID;
mDataMimeType = DataConstants.NOTE;
mDataContent = "";
mDataContentData1 = 0;
mDataContentData3 = "";
mDiffDataValues = new ContentValues();
mContentResolver = context.getContentResolver(); // 获取内容解析器
mIsCreate = true; // 标记为新建状态
mDataId = INVALID_ID; // 设置无效ID
mDataMimeType = DataConstants.NOTE; // 默认MIME类型为笔记
mDataContent = ""; // 初始化内容为空
mDataContentData1 = 0; // 初始化数据1为0
mDataContentData3 = ""; // 初始化数据3为空
mDiffDataValues = new ContentValues(); // 初始化变更值集合
}
// 从Cursor构造数据对象，用于从数据库查询结果创建对象
public SqlData(Context context, Cursor c) {
mContentResolver = context.getContentResolver();
mIsCreate = false;
loadFromCursor(c);
mDiffDataValues = new ContentValues();
mContentResolver = context.getContentResolver(); // 获取内容解析器
mIsCreate = false; // 标记为非新建状态
loadFromCursor(c); // 从Cursor加载数据
mDiffDataValues = new ContentValues(); // 初始化变更值集合
}
// 从Cursor加载数据到对象
private void loadFromCursor(Cursor c) {
mDataId = c.getLong(DATA_ID_COLUMN);
mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN);
mDataContent = c.getString(DATA_CONTENT_COLUMN);
mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN);
mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN);
mDataId = c.getLong(DATA_ID_COLUMN); // 获取ID
mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN); // 获取MIME类型
mDataContent = c.getString(DATA_CONTENT_COLUMN); // 获取内容
mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN); // 获取数据1
mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN); // 获取数据3
}
// 根据JSON对象设置数据内容
public void setContent(JSONObject js) throws JSONException {
// 处理ID
long dataId = js.has(DataColumns.ID) ? js.getLong(DataColumns.ID) : INVALID_ID;
if (mIsCreate || mDataId != dataId) {
mDiffDataValues.put(DataColumns.ID, dataId);
}
mDataId = dataId;
// 处理MIME类型
String dataMimeType = js.has(DataColumns.MIME_TYPE) ? js.getString(DataColumns.MIME_TYPE)
: DataConstants.NOTE;
if (mIsCreate || !mDataMimeType.equals(dataMimeType)) {
@ -111,18 +111,21 @@ public class SqlData {
}
mDataMimeType = dataMimeType;
// 处理内容
String dataContent = js.has(DataColumns.CONTENT) ? js.getString(DataColumns.CONTENT) : "";
if (mIsCreate || !mDataContent.equals(dataContent)) {
mDiffDataValues.put(DataColumns.CONTENT, dataContent);
}
mDataContent = dataContent;
// 处理数据1
long dataContentData1 = js.has(DataColumns.DATA1) ? js.getLong(DataColumns.DATA1) : 0;
if (mIsCreate || mDataContentData1 != dataContentData1) {
mDiffDataValues.put(DataColumns.DATA1, dataContentData1);
}
mDataContentData1 = dataContentData1;
// 处理数据3
String dataContentData3 = js.has(DataColumns.DATA3) ? js.getString(DataColumns.DATA3) : "";
if (mIsCreate || !mDataContentData3.equals(dataContentData3)) {
mDiffDataValues.put(DataColumns.DATA3, dataContentData3);
@ -130,11 +133,13 @@ public class SqlData {
mDataContentData3 = dataContentData3;
}
// 获取数据的JSON表示
public JSONObject getContent() throws JSONException {
if (mIsCreate) {
Log.e(TAG, "it seems that we haven't created this in database yet");
return null;
}
// 创建并填充JSON对象
JSONObject js = new JSONObject();
js.put(DataColumns.ID, mDataId);
js.put(DataColumns.MIME_TYPE, mDataMimeType);
@ -144,30 +149,36 @@ public class SqlData {
return js;
}
// 提交数据到数据库
public void commit(long noteId, boolean validateVersion, long version) {
if (mIsCreate) {
// 处理新建数据
if (mDataId == INVALID_ID && mDiffDataValues.containsKey(DataColumns.ID)) {
mDiffDataValues.remove(DataColumns.ID);
}
// 设置所属笔记ID
mDiffDataValues.put(DataColumns.NOTE_ID, noteId);
// 插入数据到ContentProvider
Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues);
try {
// 从返回的Uri中获取数据ID
mDataId = Long.valueOf(uri.getPathSegments().get(1));
} catch (NumberFormatException e) {
Log.e(TAG, "Get note id error :" + e.toString());
throw new ActionFailureException("create note failed");
}
} else {
// 处理已存在数据的更新
if (mDiffDataValues.size() > 0) {
int result = 0;
if (!validateVersion) {
// 不验证版本的更新
result = mContentResolver.update(ContentUris.withAppendedId(
Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, null, null);
} else {
// 验证版本的更新，防止并发冲突
result = mContentResolver.update(ContentUris.withAppendedId(
Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues,
Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues,
" ? in (SELECT " + NoteColumns.ID + " FROM " + TABLE.NOTE
+ " WHERE " + NoteColumns.VERSION + "=?)", new String[] {
String.valueOf(noteId), String.valueOf(version)
@ -178,12 +189,13 @@ public class SqlData {
}
}
}
// 清空变更值，标记为非新建状态
mDiffDataValues.clear();
mIsCreate = false;
}
// 获取数据ID
public long getId() {
return mDataId;
}
}
}
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