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