| /* |
| * Copyright (C) 2006-2008 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 "Cursor" |
| |
| #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 "sqlite3_exception.h" |
| |
| |
| namespace android { |
| |
| static jfieldID gHandleField; |
| static jfieldID gStatementField; |
| |
| |
| #define GET_STATEMENT(env, object) \ |
| (sqlite3_stmt *)env->GetIntField(object, gStatementField) |
| #define GET_HANDLE(env, object) \ |
| (sqlite3 *)env->GetIntField(object, gHandleField) |
| |
| |
| sqlite3_stmt * compile(JNIEnv* env, jobject object, |
| sqlite3 * handle, jstring sqlString) |
| { |
| int err; |
| jchar const * sql; |
| jsize sqlLen; |
| sqlite3_stmt * statement = GET_STATEMENT(env, object); |
| |
| // Make sure not to leak the statement if it already exists |
| if (statement != NULL) { |
| sqlite3_finalize(statement); |
| env->SetIntField(object, gStatementField, 0); |
| } |
| |
| // Compile the SQL |
| sql = env->GetStringChars(sqlString, NULL); |
| sqlLen = env->GetStringLength(sqlString); |
| err = sqlite3_prepare16_v2(handle, sql, sqlLen * 2, &statement, NULL); |
| env->ReleaseStringChars(sqlString, sql); |
| |
| if (err == SQLITE_OK) { |
| // Store the statement in the Java object for future calls |
| LOGV("Prepared statement %p on %p", statement, handle); |
| env->SetIntField(object, gStatementField, (int)statement); |
| return statement; |
| } else { |
| // Error messages like 'near ")": syntax error' are not |
| // always helpful enough, so construct an error string that |
| // includes the query itself. |
| const char *query = env->GetStringUTFChars(sqlString, NULL); |
| char *message = (char*) malloc(strlen(query) + 50); |
| if (message) { |
| strcpy(message, ", while compiling: "); // less than 50 chars |
| strcat(message, query); |
| } |
| env->ReleaseStringUTFChars(sqlString, query); |
| throw_sqlite3_exception(env, handle, message); |
| free(message); |
| return NULL; |
| } |
| } |
| |
| static void native_compile(JNIEnv* env, jobject object, jstring sqlString) |
| { |
| compile(env, object, GET_HANDLE(env, object), sqlString); |
| } |
| |
| static void native_finalize(JNIEnv* env, jobject object) |
| { |
| int err; |
| sqlite3_stmt * statement = GET_STATEMENT(env, object); |
| |
| if (statement != NULL) { |
| sqlite3_finalize(statement); |
| env->SetIntField(object, gStatementField, 0); |
| } |
| } |
| |
| static JNINativeMethod sMethods[] = |
| { |
| /* name, signature, funcPtr */ |
| {"native_compile", "(Ljava/lang/String;)V", (void *)native_compile}, |
| {"native_finalize", "()V", (void *)native_finalize}, |
| }; |
| |
| int register_android_database_SQLiteCompiledSql(JNIEnv * env) |
| { |
| jclass clazz; |
| |
| clazz = env->FindClass("android/database/sqlite/SQLiteCompiledSql"); |
| if (clazz == NULL) { |
| LOGE("Can't find android/database/sqlite/SQLiteCompiledSql"); |
| return -1; |
| } |
| |
| gHandleField = env->GetFieldID(clazz, "nHandle", "I"); |
| gStatementField = env->GetFieldID(clazz, "nStatement", "I"); |
| |
| if (gHandleField == NULL || gStatementField == NULL) { |
| LOGE("Error locating fields"); |
| return -1; |
| } |
| |
| return AndroidRuntime::registerNativeMethods(env, |
| "android/database/sqlite/SQLiteCompiledSql", sMethods, NELEM(sMethods)); |
| } |
| |
| } // namespace android |