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/*
* 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
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