sqlite库学习(8)sqlite插入与读取二进制
源码下载：https://download.csdn.net/download/no2101/12428235
1、插入
void DB_Insert_table_student(sqlite3 *db)
{
int result = -1;
sqlite3_stmt *stat = 0;
const char *pzTail = NULL;
const char *sqls[] = {
"insert into STUDENT(ID, name, picture) values(0, '张三', ?);",
"insert into STUDENT(ID, name, picture) values(1, '李四', ?);"
};
const char *names[] = {
"pic\\1.jpg",
"pic\\2.jpg"
};
for (int j = 0; j < sizeof(sqls) / sizeof(char*); j++)
{
//准备
result = sqlite3_prepare(db, sqls[j], -1, &stat, &pzTail);
if (!result && stat){
FILE *file = NULL;
fopen_s(&file, names[j], "rb+");
char* data = NULL;
long l_file_size = 0;
if (file){
fseek(file, 0, SEEK_END);
l_file_size = ftell(file);
fseek(file, 0, SEEK_SET);
data = new char[l_file_size];
fread(data, 1, l_file_size, file);
//和sql的第一个？绑定（如果有多个问号，那就要分开绑定）
result = sqlite3_bind_blob(stat, 1, data, l_file_size, NULL);
//将数据输入数据库
if (sqlite3_step(stat) != SQLITE_DONE)
{
sqlite3_finalize(stat);
sqlite3_close(db);
return;
}
fclose(file);
delete[] data;
printf("Insert STUDENT Succeed.\n");
}
}
//释放stat
sqlite3_finalize(stat);
}
}2、读取
void DB_Select_table_student(sqlite3 *db)
{
char *sql = "SELECT * from STUDENT;";
sqlite3_stmt * stmt3 = NULL;
if (sqlite3_prepare_v2(db, sql, strlen(sql), &stmt3, NULL) != SQLITE_OK)
{
if (stmt3)
sqlite3_finalize(stmt3);
sqlite3_close(db);
return;
}
int fieldCount = sqlite3_column_count(stmt3);//stmt3返回的是查询结果集
char picname[100];
do
{
int r = sqlite3_step(stmt3);
if (r == SQLITE_ROW) {
for (int i = 0; i < fieldCount; ++i) {
int vtype = sqlite3_column_type(stmt3, i);//字段类型获取
//const char* dtype = sqlite3_column_decltype(stmt3, i);//INT REAL之类
const char* otype = sqlite3_column_origin_name(stmt3, i);//申明
printf("%s ", otype);
if (strcmp(otype, "name") == 0)
{
memset(picname, 0, 100);
}
//判断当前记录当前字段的类型，根据返回的类型使用不同的API函数
//获取实际的数据值
if (vtype == SQLITE_INTEGER) {
int v = sqlite3_column_int(stmt3, i);
printf("is %d.\n", v);
}
else if (vtype == SQLITE_FLOAT) {
double v = sqlite3_column_double(stmt3, i);
printf("is %f.\n", v);
}
else if (vtype == SQLITE_TEXT) {
const char* v = (const char*)sqlite3_column_text(stmt3, i);
strcpy(picname, v);
printf("is %s.\n", v);
}
else if (vtype == SQLITE_BLOB)
{
const void* piblob = sqlite3_column_blob(stmt3, i);
int size = sqlite3_column_bytes(stmt3, i);
char total_name[256];
memset(total_name, 0, 256);
sprintf(total_name, "out_pic\\%s.jpg", picname);
FILE *f = fopen(total_name, "wb+");
fwrite(piblob, 1, size, f);
fclose(f);
}
else if (vtype == SQLITE_NULL) {
printf("is NULL.\n");
}
}
}
else if (r == SQLITE_DONE) {
printf("finish successfully\n");
break;
}
else {
printf("Failed to SELECT.\n");
sqlite3_finalize(stmt3);
sqlite3_close(db);
return;
}
printf("\n");
} while (true);
printf("sqlite3_prepare_v2 student select done successfully\n");
}