使用NDK开发SQLite3

尝试环境：

　　Android2.2（源码） SDK

　　android-ndk-r7

尝试在NDK下面使用C语言做Android的SQLite3数据库存储功能。做了如下尝试：

在Android的源代码中找到sqlite3.h和libsqlite.so拷贝到NDK的lib（D:\android\android-ndk-r7-linux\platforms\android-3\arch-arm\usr\lib）和include（D:\android\android-ndk-r7-linux\platforms\android-3\arch-arm\usr\include）目录下。

测试代码：

/* -- START -- */ /*  *代码借用：http://www.cnblogs.com/sardine/archive/2011/07/30/2121853.html  */ #include <sqlite3.h> #include <stdio.h>  static int _sql_callback(void * notused, int argc, char ** argv, char ** szColName) {         int i;         for ( i=0; i < argc; i++ )         {                 printf( "%s = %s\n", *szColName, argv == 0 ? "NUL" : *argv );         }         return 0; }   int main() {     const char * sSQL1 = "create table users(userid varchar(20) PRIMARY KEY,age int,regtime datetime);";     const char * sSQL2 = "insert into users values('guilh',29,'2009-7-16');";     const char * sSQL3 = "select * from users;";          sqlite3 * db = 0;         char * pErrMsg = 0;          int ret = 0;         const char* const dbname = "gtest.db";              //打开数据库，如果数据库不存在，会建立一个数据库     ret = sqlite3_open(dbname, &db);      if ( ret != SQLITE_OK )     {         printf("open error! : %s", sqlite3_errmsg(db));         return(1);     }      printf("open db OK!\n");      // 执行建表SQL     sqlite3_exec( db, sSQL1, 0, 0, &pErrMsg );     if ( ret != SQLITE_OK )     {         //fprintf(stderr, "SQL error: %s\n", pErrMsg);         printf("SQL error: %s\n", pErrMsg);         sqlite3_free(pErrMsg);     }      // 执行插入记录SQL     sqlite3_exec( db, sSQL2, 0, 0, &pErrMsg);      // 查询数据表     sqlite3_exec( db, sSQL3, _sql_callback, 0, &pErrMsg);      // 关闭数据库     sqlite3_close(db);     db = 0;      return 0; }

Android.mk: Android的make文件

#### START #### LOCAL_PATH:= $(call my-dir)  include $(CLEAR_VARS) #include $(LOCAL_PATH)/../config.mk  LOCAL_SRC_FILES:= test.cpp   LOCAL_LDLIBS := -lcutils -licuuc -licui18n -lutils -licudata -lsqlite    #LOCAL_PRELINK_MODULE := false  LOCAL_MODULE :=  sqlite3  include $(BUILD_EXECUTABLE)  ### END ###

如果此时直接编译的话会有如下提示：

$ make APP=sqlite3 Android NDK: Building for application 'sqlite3' Executable     : sqlite3 D:/android/android-ndk-r7-linux/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/http://www.cnblogs.com/http://www.cnblogs.com/arm-linux-androideabi/bin/ld.exe: warning: libicuuc.so, needed by ./platforms/android-3/arch-arm/usr/lib/libsqlite.so, not found (try using -rpath or -rpath-link) D:/android/android-ndk-r7-linux/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/http://www.cnblogs.com/http://www.cnblogs.com/arm-linux-androideabi/bin/ld.exe: warning: libicui18n.so, needed by ./platforms/android-3/arch-arm/usr/lib/libsqlite.so, not found (try using -rpath or -rpath-link) D:/android/android-ndk-r7-linux/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/http://www.cnblogs.com/http://www.cnblogs.com/arm-linux-androideabi/bin/ld.exe: warning: libutils.so, needed by ./platforms/android-3/arch-arm/usr/lib/libsqlite.so, not found (try using -rpath or -rpath-link) ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `ucol_getShortDefinitionString_4_2' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `ucol_close_4_2' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `utf32_to_utf8' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `ucol_open_4_2' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `unorm_next_4_2' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `u_isalpha_4_2' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `ucol_strcollIter_4_2' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `ucol_getSortKey_4_2' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `utf8_length_from_utf32' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `utf8_appendCharSafeBody_4_2' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `ucol_strcoll_4_2' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `utf8_length' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `uiter_setUTF8_4_2' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `u_toupper_4_2' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `u_strtok_r_4_2' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `utf32_at' ./platforms/android-3/arch-arm/usr/lib/libsqlite.so: undefined reference to `ucol_setAttribute_4_2' collect2: ld returned 1 exit status build/core/build-binary.mk:324: recipe for target `out/apps/sqlite3/armeabi/sqlite3' failed make: *** [out/apps/sqlite3/armeabi/sqlite3] Error 1

按照上面提示，依次从目标环境（源码或是你手机中）拷贝libcutils.so libicuuc.so libicui18n.so libutils.so libicudata.so到NDK的lib目录（见上）下。

如果出现如下错误：

$ make APP=sqlite3 Android NDK: Building for application 'sqlite3' Executable     : sqlite3 ./platforms/android-3/arch-arm/usr/lib/libcutils.so: undefined reference to `ioprio_set' ./platforms/android-3/arch-arm/usr/lib/libicuuc.so: undefined reference to `mbstowcs' ./platforms/android-3/arch-arm/usr/lib/libcutils.so: undefined reference to `ioprio_get' ./platforms/android-3/arch-arm/usr/lib/libicuuc.so: undefined reference to `wcstombs' collect2: ld returned 1 exit status build/core/build-binary.mk:324: recipe for target `out/apps/sqlite3/armeabi/sqlite3' failed make: *** [out/apps/sqlite3/armeabi/sqlite3] Error 1

拷贝目标环境的libc.so替换掉你开发环境里面的。

###执行结果如下：# ./sqlite3 ./sqlite3 open db OK! userid = guilh userid = guilh userid = guilh

生成的数据库如下：

整个测试项目源代码：SQLite3.rar

数据库里面的regtime不对，是应该sql语句里面的时间不对。改下就ok：

const char * sSQL2 = "insert into users values('guilh',29,'2012-12-30 00:00:00');";

函数在线列表：http://www.sqlite.org/c3ref/funclist.html

sqlite取表函数（推荐）：

int sqlite3_get_table(  sqlite3 *db,          /* An open database */  const char *zSql,     /* SQL to be evaluated */  char ***pazResult,    /* Results of the query */  int *pnRow,           /* Number of result rows written here */  int *pnColumn,        /* Number of result columns written here */  char **pzErrmsg       /* Error msg written here */);void sqlite3_free_table(char **result);

API说明文件：http://www.sqlite.org/c3ref/free_table.html

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