下面列出了com.facebook.react.bridge.ReadableArray#isNull ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
private void bindArgsToStatement(SQLiteStatement myStatement, ReadableArray sqlArgs) {
if (sqlArgs == null)
return;
for (int i = 0; i < sqlArgs.size(); i++) {
ReadableType type = sqlArgs.getType(i);
if (type == ReadableType.Number) {
double tmp = sqlArgs.getDouble(i);
if (tmp == (long) tmp) {
myStatement.bindLong(i + 1, (long) tmp);
} else {
myStatement.bindDouble(i + 1, tmp);
}
} else if (sqlArgs.isNull(i)) {
myStatement.bindNull(i + 1);
} else {
myStatement.bindString(i + 1, sqlArgs.getString(i));
}
}
}
private void bindArgsToStatement(SQLiteStatement myStatement, ReadableArray sqlArgs) {
for (int i = 0; i < sqlArgs.size(); i++) {
ReadableType type = sqlArgs.getType(i);
if (type == ReadableType.Number){
double tmp = sqlArgs.getDouble(i);
if (tmp == (long) tmp) {
myStatement.bindLong(i + 1, (long) tmp);
} else {
myStatement.bindDouble(i + 1, tmp);
}
} else if (sqlArgs.isNull(i)) {
myStatement.bindNull(i + 1);
} else {
myStatement.bindString(i + 1, SQLitePluginConverter.getString(sqlArgs,i,""));
}
}
}
ArrayList<U> createEntries(ReadableArray yValues) {
ArrayList<U> entries = new ArrayList<>(yValues.size());
for (int j = 0; j < yValues.size(); j++) {
if (!yValues.isNull(j)) {
entries.add(createEntry(yValues, j));
}
}
return entries;
}
private void setBottomSheetState(BottomSheetBehaviorView view, @Nullable ReadableArray args) {
if (!args.isNull(0)) {
int newState = args.getInt(0);
setState(view, newState);
}
}
private boolean executeAndPossiblyThrow(Action action, ReadableMap args, CallbackContext cbc){
String dbname;
switch (action) {
case echoStringValue:
String echo_value = SQLitePluginConverter.getString(args,"value","");
cbc.success(echo_value);
break;
case open:
dbname = SQLitePluginConverter.getString(args,"name","");
// open database and start reading its queue
this.startDatabase(dbname, args, cbc);
break;
case close:
dbname = SQLitePluginConverter.getString(args,"path","");
// put request in the q to close the db
this.closeDatabase(dbname, cbc);
break;
case attach:
dbname = SQLitePluginConverter.getString(args,"path","");
String dbAlias = SQLitePluginConverter.getString(args,"dbAlias","");
String dbNameToAttach = SQLitePluginConverter.getString(args,"dbName","");
this.attachDatabase(dbname,dbNameToAttach,dbAlias,cbc);
break;
case delete:
dbname = SQLitePluginConverter.getString(args,"path","");
deleteDatabase(dbname, cbc);
break;
case executeSqlBatch:
case backgroundExecuteSqlBatch:
String [] queries;
String [] queryIDs = null;
ReadableArray[] queryParams = null;
ReadableMap dbArgs = (ReadableMap) SQLitePluginConverter.get(args,"dbargs",null);
dbname = SQLitePluginConverter.getString(dbArgs,"dbname","");
ReadableArray txArgs = (ReadableArray) SQLitePluginConverter.get(args,"executes",null);
if (txArgs.isNull(0)) {
queries = new String[0];
} else {
int len = txArgs.size();
queries = new String[len];
queryIDs = new String[len];
queryParams = new ReadableArray[len];
for (int i = 0; i < len; i++) {
ReadableMap queryArgs = (ReadableMap) SQLitePluginConverter.get(txArgs,i,null);
queries[i] = SQLitePluginConverter.getString(queryArgs,"sql","");
queryIDs[i] = SQLitePluginConverter.getString(queryArgs,"qid","");
queryParams[i] = (ReadableArray) SQLitePluginConverter.get(queryArgs,"params",null);
}
}
// put db query in the queue to be executed in the db thread:
DBQuery q = new DBQuery(queries, queryIDs, queryParams, cbc);
DBRunner r = dbrmap.get(dbname);
if (r != null) {
try {
r.q.put(q);
} catch(Exception ex) {
FLog.e(TAG, "couldn't add to queue", ex);
cbc.error("couldn't add to queue");
}
} else {
cbc.error("database not open");
}
break;
}
return true;
}
/**
* Get rows results from query cursor.
*
* @return results in string form
*/
private WritableMap executeSqlStatementNDK(String query, ReadableArray queryArgs,
CallbackContext cbc) throws Exception {
WritableMap rowsResult = Arguments.createMap();
boolean hasRows;
SQLiteStatement myStatement = null;
try {
try {
myStatement = mydb.prepareStatement(query);
if (queryArgs != null) {
for (int i = 0; i < queryArgs.size(); ++i) {
ReadableType type = queryArgs.getType(i);
if (type == ReadableType.Number){
double tmp = queryArgs.getDouble(i);
if (tmp == (long) tmp) {
myStatement.bindLong(i + 1, (long) tmp);
} else {
myStatement.bindDouble(i + 1, tmp);
}
} else if (queryArgs.isNull(i)) {
myStatement.bindNull(i + 1);
} else {
myStatement.bindTextNativeString(i + 1, SQLitePluginConverter.getString(queryArgs,i,""));
}
}
}
hasRows = myStatement.step();
} catch (Exception ex) {
FLog.e(TAG, "SQLitePlugin.executeSql[Batch]() failed", ex);
throw ex;
}
// If query result has rows
if (hasRows) {
WritableArray rowsArrayResult = Arguments.createArray();
String key;
int colCount = myStatement.getColumnCount();
// Build up JSON result object for each row
do {
WritableMap row = Arguments.createMap();
for (int i = 0; i < colCount; ++i) {
key = myStatement.getColumnName(i);
switch (myStatement.getColumnType(i)) {
case SQLColumnType.NULL:
row.putNull(key);
break;
case SQLColumnType.REAL:
row.putDouble(key, myStatement.getColumnDouble(i));
break;
case SQLColumnType.INTEGER:
row.putDouble(key, myStatement.getColumnLong(i));
break;
case SQLColumnType.BLOB:
case SQLColumnType.TEXT:
default:
row.putString(key, myStatement.getColumnTextNativeString(i));
}
}
rowsArrayResult.pushMap(row);
} while (myStatement.step());
rowsResult.putArray("rows", rowsArrayResult);
}
} finally {
if (myStatement != null) {
myStatement.dispose();
}
}
return rowsResult;
}
/**
* Get rows results from query cursor.
*
* @return results in string form
*/
private WritableMap executeSqlStatementQuery(SQLiteDatabase mydb,
String query, ReadableArray queryParams,
CallbackContext cbc) throws Exception {
WritableMap rowsResult = Arguments.createMap();
Cursor cur;
try {
String[] params = new String[0];
if (queryParams != null) {
int size = queryParams.size();
params = new String[size];
for (int j = 0; j < size; j++) {
if (queryParams.isNull(j))
params[j] = "";
else
params[j] = queryParams.getString(j);
}
}
cur = mydb.rawQuery(query, params);
} catch (Exception ex) {
FLog.e(SQLitePlugin.TAG, "SQLiteAndroidDatabase.executeSql[Batch]() failed", ex);
throw ex;
}
// If query result has rows
if (cur != null && cur.moveToFirst()) {
WritableArray rowsArrayResult = Arguments.createArray();
String key = "";
int colCount = cur.getColumnCount();
// Build up JSON result object for each row
do {
WritableMap row = Arguments.createMap();
for (int i = 0; i < colCount; ++i) {
key = cur.getColumnName(i);
bindRow(row, key, cur, i);
}
rowsArrayResult.pushMap(row);
} while (cur.moveToNext());
rowsResult.putArray("rows", rowsArrayResult);
}
if (cur != null) {
cur.close();
}
return rowsResult;
}
private boolean executeAndPossiblyThrow(Action action, ReadableMap args, CallbackContext cbc){
String dbname;
switch (action) {
case echoStringValue:
String echo_value = SQLitePluginConverter.getString(args,"value","");
cbc.success(echo_value);
break;
case open:
dbname = SQLitePluginConverter.getString(args,"name","");
// open database and start reading its queue
this.startDatabase(dbname, args, cbc);
break;
case close:
dbname = SQLitePluginConverter.getString(args,"path","");
// put request in the q to close the db
this.closeDatabase(dbname, cbc);
break;
case attach:
dbname = SQLitePluginConverter.getString(args,"path","");
String dbAlias = SQLitePluginConverter.getString(args,"dbAlias","");
String dbNameToAttach = SQLitePluginConverter.getString(args,"dbName","");
this.attachDatabase(dbname,dbNameToAttach,dbAlias,cbc);
break;
case delete:
dbname = SQLitePluginConverter.getString(args,"path","");
deleteDatabase(dbname, cbc);
break;
case executeSqlBatch:
case backgroundExecuteSqlBatch:
String [] queries;
String [] queryIDs = null;
ReadableArray [] queryParams = null;
ReadableMap dbArgs = (ReadableMap) SQLitePluginConverter.get(args,"dbargs",null);
dbname = SQLitePluginConverter.getString(dbArgs,"dbname","");
ReadableArray txArgs = (ReadableArray) SQLitePluginConverter.get(args,"executes",null);
if (txArgs.isNull(0)) {
queries = new String[0];
} else {
int len = txArgs.size();
queries = new String[len];
queryIDs = new String[len];
queryParams = new ReadableArray[len];
for (int i = 0; i < len; i++) {
ReadableMap queryArgs = (ReadableMap) SQLitePluginConverter.get(txArgs,i,null);
queries[i] = SQLitePluginConverter.getString(queryArgs,"sql","");
queryIDs[i] = SQLitePluginConverter.getString(queryArgs,"qid","");
queryParams[i] = (ReadableArray) SQLitePluginConverter.get(queryArgs,"params",null);
}
}
// put db query in the queue to be executed in the db thread:
DBQuery q = new DBQuery(queries, queryIDs, queryParams, cbc);
DBRunner r = dbrmap.get(dbname);
if (r != null) {
try {
r.q.put(q);
} catch(Exception ex) {
FLog.e(TAG, "couldn't add to queue", ex);
cbc.error("couldn't add to queue");
}
} else {
cbc.error("database not open");
}
break;
}
return true;
}
/**
* Execute Sql Statement Query
*
* @param mydb - database
* @param query - SQL query to execute
* @param queryParams - parameters to the query
* @param cbc - callback object
*
* @throws Exception
* @return results in string form
*/
private WritableMap executeSqlStatementQuery(SQLiteDatabase mydb,
String query, ReadableArray queryParams,
CallbackContext cbc) throws Exception {
WritableMap rowsResult = Arguments.createMap();
Cursor cur = null;
try {
try {
String[] params = new String[0];
if (queryParams != null) {
int size = queryParams.size();
params = new String[size];
for (int j = 0; j < size; j++) {
if (queryParams.isNull(j)) {
params[j] = "";
} else {
params[j] = SQLitePluginConverter.getString(queryParams, j, "");
}
}
}
cur = mydb.rawQuery(query, params);
} catch (Exception ex) {
FLog.e(TAG, "SQLitePlugin.executeSql[Batch]() failed", ex);
throw ex;
}
// If query result has rows
if (cur != null && cur.moveToFirst()) {
WritableArray rowsArrayResult = Arguments.createArray();
String key;
int colCount = cur.getColumnCount();
// Build up result object for each row
do {
WritableMap row = Arguments.createMap();
for (int i = 0; i < colCount; ++i) {
key = cur.getColumnName(i);
bindRow(row, key, cur, i);
}
rowsArrayResult.pushMap(row);
} while (cur.moveToNext());
rowsResult.putArray("rows", rowsArrayResult);
}
} finally {
closeQuietly(cur);
}
return rowsResult;
}