一、进入sqlite官网下载sqlite源码。
二、将sqlite源码中的sqlite3.c和sqlite3.h加入工程,并添加到CMakeLists.txt,就可以使用sqlite数据库了。
工程项目结构:
CMakeLists.txt:
# Sets the minimum version of CMake required to build the native library. cmake_minimum_required(VERSION 3.22.1) # Declares and names the project. project("test-project") # Creates and names a library, sets it as either STATIC # or SHARED, and provides the relative paths to its source code. # You can define multiple libraries, and CMake builds them for you. # Gradle automatically packages shared libraries with your APK. add_library( # Sets the name of the library. test # Sets the library as a shared library. SHARED sqlite3.c # Provides a relative path to your source file(s). test.cpp ) # Searches for a specified prebuilt library and stores the path as a # variable. Because CMake includes system libraries in the search path by # default, you only need to specify the name of the public NDK library # you want to add. CMake verifies that the library exists before # completing its build. find_library( # Sets the name of the path variable. log-lib # Specifies the name of the NDK library that # you want CMake to locate. log ) include_directories(include) # Specifies libraries CMake should link to your target library. You # can link multiple libraries, such as libraries you define in this # build script, prebuilt third-party libraries, or system libraries. target_link_libraries( # Specifies the target library. test # Links the target library to the log library # included in the NDK. ${log-lib})
三、调用sqlite的接口进行数据库的创建、数据的添加和查询。
#include#include #include extern "C" JNIEXPORT void JNICALL Java_com_example_MainActivity_testMethod(JNIEnv *env, jobject) { sqlite3 *db; char *err_msg = 0; // 创建表 const char *create_table_sql = "create table if not exists user(id integer, name text);"; // 插入数据 const char *insert_data_sql = "insert into user(id, name) values(200, 'hyh');"; // 查询数据 const char *query_sql = "select * from user;"; // 打开数据库 int rc = sqlite3_open("test.db", &db); if (rc != SQLITE_OK) { __android_log_print(ANDROID_LOG_INFO, "TAG", "Open db failed: %s\n", sqlite3_errmsg(db)); goto End; } // 执行SQL语句创建一个表 rc = sqlite3_exec(db, create_table_sql, 0, 0, &err_msg); if (rc != SQLITE_OK) { __android_log_print(ANDROID_LOG_INFO, "TAG", "Create table failed: %s\n", err_msg); sqlite3_free(err_msg); goto End; } // 执行SQL语句插入数据 rc = sqlite3_exec(db, insert_data_sql, 0, 0, &err_msg); if (rc != SQLITE_OK) { __android_log_print(ANDROID_LOG_INFO, "TAG", "Insert data failed: %s\n", err_msg); goto End; } sqlite3_stmt *stmt; // 准备查询语句 rc = sqlite3_prepare_v2(db, query_sql, -1, &stmt, NULL); if (rc != SQLITE_OK) { __android_log_print(ANDROID_LOG_INFO, "TAG", "Query data failed: %s\n", err_msg); goto End; } // 执行查询并打印结果 while (sqlite3_step(stmt) == SQLITE_ROW) { int id = sqlite3_column_int(stmt, 0); const unsigned char *name = sqlite3_column_text(stmt, 1); __android_log_print(ANDROID_LOG_INFO, "TAG", "id=%d,name=%s", id, name); } // 关闭查询语句 sqlite3_finalize(stmt); End: // 关闭数据库连接 sqlite3_close(db); }
四、如果执行成功,则会打印"id=100,name=hyh"。