| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #undef LOG_TAG |
| #define LOG_TAG "SqliteCursor.cpp" |
| |
| #include <jni.h> |
| #include <JNIHelp.h> |
| #include <android_runtime/AndroidRuntime.h> |
| |
| #include <sqlite3.h> |
| |
| #include <utils/Log.h> |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "binder/CursorWindow.h" |
| #include "sqlite3_exception.h" |
| |
| |
| namespace android { |
| |
| static jint nativeFillWindow(JNIEnv* env, jclass clazz, jint databasePtr, |
| jint statementPtr, jint windowPtr, jint startPos, jint offsetParam) { |
| sqlite3* database = reinterpret_cast<sqlite3*>(databasePtr); |
| sqlite3_stmt* statement = reinterpret_cast<sqlite3_stmt*>(statementPtr); |
| CursorWindow* window = reinterpret_cast<CursorWindow*>(windowPtr); |
| |
| // Only do the binding if there is a valid offsetParam. If no binding needs to be done |
| // offsetParam will be set to 0, an invalid value. |
| if (offsetParam > 0) { |
| // Bind the offset parameter, telling the program which row to start with |
| int err = sqlite3_bind_int(statement, offsetParam, startPos); |
| if (err != SQLITE_OK) { |
| LOGE("Unable to bind offset position, offsetParam = %d", offsetParam); |
| throw_sqlite3_exception(env, database); |
| return 0; |
| } |
| LOG_WINDOW("Bound to startPos %d", startPos); |
| } else { |
| LOG_WINDOW("Not binding to startPos %d", startPos); |
| } |
| |
| // We assume numRows is initially 0. |
| LOG_WINDOW("Window: numRows = %d, size = %d, freeSpace = %d", |
| window->getNumRows(), window->size(), window->freeSpace()); |
| |
| int numColumns = sqlite3_column_count(statement); |
| status_t status = window->setNumColumns(numColumns); |
| if (status) { |
| LOGE("Failed to change column count from %d to %d", window->getNumColumns(), numColumns); |
| jniThrowException(env, "java/lang/IllegalStateException", "numColumns mismatch"); |
| return 0; |
| } |
| |
| int retryCount = 0; |
| int totalRows = 0; |
| int addedRows = 0; |
| bool windowFull = false; |
| bool gotException = false; |
| const bool countAllRows = (startPos == 0); // when startPos is 0, we count all rows |
| while (!gotException && (!windowFull || countAllRows)) { |
| int err = sqlite3_step(statement); |
| if (err == SQLITE_ROW) { |
| LOG_WINDOW("Stepped statement %p to row %d", statement, totalRows); |
| retryCount = 0; |
| totalRows += 1; |
| |
| // Skip the row if the window is full or we haven't reached the start position yet. |
| if (startPos >= totalRows || windowFull) { |
| continue; |
| } |
| |
| // Allocate a new field directory for the row. This pointer is not reused |
| // since it may be possible for it to be relocated on a call to alloc() when |
| // the field data is being allocated. |
| status = window->allocRow(); |
| if (status) { |
| LOG_WINDOW("Failed allocating fieldDir at startPos %d row %d, error=%d", |
| startPos, addedRows, status); |
| windowFull = true; |
| continue; |
| } |
| |
| // Pack the row into the window. |
| for (int i = 0; i < numColumns; i++) { |
| int type = sqlite3_column_type(statement, i); |
| if (type == SQLITE_TEXT) { |
| // TEXT data |
| const char* text = reinterpret_cast<const char*>( |
| sqlite3_column_text(statement, i)); |
| // SQLite does not include the NULL terminator in size, but does |
| // ensure all strings are NULL terminated, so increase size by |
| // one to make sure we store the terminator. |
| size_t sizeIncludingNull = sqlite3_column_bytes(statement, i) + 1; |
| status = window->putString(addedRows, i, text, sizeIncludingNull); |
| if (status) { |
| LOG_WINDOW("Failed allocating %u bytes for text at %d,%d, error=%d", |
| sizeIncludingNull, startPos + addedRows, i, status); |
| windowFull = true; |
| break; |
| } |
| LOG_WINDOW("%d,%d is TEXT with %u bytes", |
| startPos + addedRows, i, sizeIncludingNull); |
| } else if (type == SQLITE_INTEGER) { |
| // INTEGER data |
| int64_t value = sqlite3_column_int64(statement, i); |
| status = window->putLong(addedRows, i, value); |
| if (status) { |
| LOG_WINDOW("Failed allocating space for a long in column %d, error=%d", |
| i, status); |
| windowFull = true; |
| break; |
| } |
| LOG_WINDOW("%d,%d is INTEGER 0x%016llx", startPos + addedRows, i, value); |
| } else if (type == SQLITE_FLOAT) { |
| // FLOAT data |
| double value = sqlite3_column_double(statement, i); |
| status = window->putDouble(addedRows, i, value); |
| if (status) { |
| LOG_WINDOW("Failed allocating space for a double in column %d, error=%d", |
| i, status); |
| windowFull = true; |
| break; |
| } |
| LOG_WINDOW("%d,%d is FLOAT %lf", startPos + addedRows, i, value); |
| } else if (type == SQLITE_BLOB) { |
| // BLOB data |
| const void* blob = sqlite3_column_blob(statement, i); |
| size_t size = sqlite3_column_bytes(statement, i); |
| status = window->putBlob(addedRows, i, blob, size); |
| if (status) { |
| LOG_WINDOW("Failed allocating %u bytes for blob at %d,%d, error=%d", |
| size, startPos + addedRows, i, status); |
| windowFull = true; |
| break; |
| } |
| LOG_WINDOW("%d,%d is Blob with %u bytes", |
| startPos + addedRows, i, size); |
| } else if (type == SQLITE_NULL) { |
| // NULL field |
| status = window->putNull(addedRows, i); |
| if (status) { |
| LOG_WINDOW("Failed allocating space for a null in column %d, error=%d", |
| i, status); |
| windowFull = true; |
| break; |
| } |
| |
| LOG_WINDOW("%d,%d is NULL", startPos + addedRows, i); |
| } else { |
| // Unknown data |
| LOGE("Unknown column type when filling database window"); |
| throw_sqlite3_exception(env, "Unknown column type when filling window"); |
| gotException = true; |
| break; |
| } |
| } |
| |
| // Update the final row tally. |
| if (windowFull || gotException) { |
| window->freeLastRow(); |
| } else { |
| addedRows += 1; |
| } |
| } else if (err == SQLITE_DONE) { |
| // All rows processed, bail |
| LOG_WINDOW("Processed all rows"); |
| break; |
| } else if (err == SQLITE_LOCKED || err == SQLITE_BUSY) { |
| // The table is locked, retry |
| LOG_WINDOW("Database locked, retrying"); |
| if (retryCount > 50) { |
| LOGE("Bailing on database busy retry"); |
| throw_sqlite3_exception(env, database, "retrycount exceeded"); |
| gotException = true; |
| } else { |
| // Sleep to give the thread holding the lock a chance to finish |
| usleep(1000); |
| retryCount++; |
| } |
| } else { |
| throw_sqlite3_exception(env, database); |
| gotException = true; |
| } |
| } |
| |
| LOG_WINDOW("Resetting statement %p after fetching %d rows and adding %d rows" |
| "to the window in %d bytes", |
| statement, totalRows, addedRows, window->size() - window->freeSpace()); |
| sqlite3_reset(statement); |
| |
| // Report the total number of rows on request. |
| if (startPos > totalRows) { |
| LOGE("startPos %d > actual rows %d", startPos, totalRows); |
| } |
| return countAllRows ? totalRows : 0; |
| } |
| |
| static jint nativeColumnCount(JNIEnv* env, jclass clazz, jint statementPtr) { |
| sqlite3_stmt* statement = reinterpret_cast<sqlite3_stmt*>(statementPtr); |
| return sqlite3_column_count(statement); |
| } |
| |
| static jstring nativeColumnName(JNIEnv* env, jclass clazz, jint statementPtr, |
| jint columnIndex) { |
| sqlite3_stmt* statement = reinterpret_cast<sqlite3_stmt*>(statementPtr); |
| const char* name = sqlite3_column_name(statement, columnIndex); |
| return env->NewStringUTF(name); |
| } |
| |
| |
| static JNINativeMethod sMethods[] = |
| { |
| /* name, signature, funcPtr */ |
| { "nativeFillWindow", "(IIIII)I", |
| (void*)nativeFillWindow }, |
| { "nativeColumnCount", "(I)I", |
| (void*)nativeColumnCount}, |
| { "nativeColumnName", "(II)Ljava/lang/String;", |
| (void*)nativeColumnName}, |
| }; |
| |
| int register_android_database_SQLiteQuery(JNIEnv * env) |
| { |
| return AndroidRuntime::registerNativeMethods(env, |
| "android/database/sqlite/SQLiteQuery", sMethods, NELEM(sMethods)); |
| } |
| |
| } // namespace android |