Use of the Sqlite3 database in the Android NDK

Work needs to use the database for a lot of inserting work, so I want to use C to do this part of the work, after looking at the data, found an article is more practical:
Method 1. Compile using the source sqlite3.h,sqlite3.c.

Method 2: Compile with Android to get the libsqlite.so library
Specific methods:
1) use adb command adb pull/system/lib/libsqlite.so to get the libsqlite.so library (under the current user's root directory).

2) Copy the obtained libsqlite.so to the $ndk/platforms/android-3/arch-arm/usr/lib directory (it is recommended to copy to the corresponding location of all platforms subdirectories)

3) Copy the Sqlite3.h header file to the $ndk/platforms/android-3/arch-arm/usr/include directory (IBID.), and the header file can be downloaded here.

4) in the Android.mk file, add the statement local_ldlibs: =-lsqlite (Note that if you need to link to compile multiple dynamic libraries, then add the dynamic library after the statement such as: local_ldlibs: =-lsqlite-llog)

5) Use the following code:
#define Logi (...) (void) __android_log_print (android_log_info, "native-activity", __va_args__))
#define LOGW (...) (void) __android_log_print (Android_log_warn, "native-activity", __va_args__))
extern "C" {
Jniexport
void Jnicall java_com_sinde_nativedb_nativedbhelper_insertwithtablename (jnienv* env,jobject obj,jstring DbPath, Jstring f ilepath,jstring tableName);
}
Jniexport
void Jnicall java_com_sinde_nativedb_nativedbhelper_insertwithtablename (jnienv* env,jobject obj,jstring DbPath, Jstring filepath,jstring tableName) {
Sqlite3 *db;
char *perrmsg = 0;
char* DbP = jstringtostring (Env,dbpath);
char* FP = jstringtostring (Env,filepath);
char* tname = jstringtostring (env,tablename);
int openstate = Sqlite3_open (dbp,&db);
if (openstate! = SQLITE_OK) {
Return
}
FILE *f;
if (f = fopen (FP, "R")) = = = NULL) {
Return
}
Char line[4096];
Char sql[6134];
Char head[1024];
memset (line,0,4096);
memset (sql,0,6134);
memset (head,0,1024);
ReadLine (F,head);
LOGW ("line:%s", head);
int size = 0;
while (!feof (f)) {
ReadLine (F,line);
sprintf (SQL, "insert into%s (%s) values (%s)", tname,head,line);
if (size==0) {
Sqlite3_exec (db, "BEGIN;", 0, 0, &perrmsg);
}
LOGW ("sql:%s", SQL);
Sqlite3_exec (DB,SQL,0,0,&PERRMSG);
if (size = = 5000) {
size = 0;
Sqlite3_exec (db, "COMMIT;", 0, 0, &perrmsg);
LOGW ("Insert 5000");
}else{
size++;
}
memset (line,0,4096);
memset (sql,0,6134);
Sqlite3_free (PERRMSG);
}
if (size! = 0) {
Sqlite3_exec (db, "COMMIT;", 0, 0, &perrmsg);
Sqlite3_free (PERRMSG);
}
LOGW ("Insert over");
Fclose (f);
Sqlite3_close (DB);
}
Read a line of the file
char* readLine (file* f,char* line) {
char* start = line;
char temp;
while ((temp = fgetc (f))! = ' \ n ') &&!feof (f)) {
*start++ = temp;
}
return line;
}
Jstring Turn char*
char* jstringtostring (jnienv* env, jstring jstr)
{
char* RTN = NULL;
Jclass clsstring = Env->findclass ("java/lang/string");
Jstring Strencode = Env->newstringutf ("Utf-8");
Jmethodid mid = Env->getmethodid (clsstring, "GetBytes", "(ljava/lang/string;) [B");
Jbytearray barr= (Jbytearray) Env->callobjectmethod (Jstr, Mid, Strencode);
Jsize alen = Env->getarraylength (Barr);
jbyte* ba = env->getbytearrayelements (Barr, Jni_false);
if (Alen > 0)
{
RTN = (char*) malloc (alen + 1);
memcpy (RTN, BA, Alen);
Rtn[alen] = 0;
}
Env->releasebytearrayelements (Barr, BA, 0);
return RTN;
}

Use of the Sqlite3 database in the Android NDK