int main(int argc,char* argv[])
{
sqlite3 *db;
sqlite3_stmt *stat;
char *zErrMsg = 0;
char buffer2[1024]="0";
sqlite3_open("./db/MetaInfo.db",&db);
int result;
if(result)
{
std::cout<<"Open the database sqlite.db Failed"<<std::endl;
}
else
{
std::cout<<"Open the database sqlite.db sucessfully"<<std::endl;
return 0;
}
sqlite3_exec(db,"CREATE TABLE list (fliename varchar(128) UNIQUE,fzip blob,ntest int,ntest1 int);",&zErrMsg);
if (zErrMsg)
{
std::cout<<"execute sql Failed. "<<zErrMsg<<std::endl;
sqlite3_free(zErrMsg);
}
//sqlite3_prepare 第一个参数是sqlite3 * 指针
//第三个参数是sql 字符串长度，-1 sqlite 自己计算
//第四个参数是sqlite3_stmt ** 类型返回的是sql 解析的语句
//第个参数是const char *pzTail 用于指向zsql中下个sql语句开始的地址上,所以pzTail并没有重新开辟内存空间
const char *pzTail =NULL;
const char *zsql = "insert into list values ('5.bmp',?,1); insert into list values ('4.bmp',1);";
int nRet = sqlite3_prepare(db,zsql,-1,&stat,&pzTail);
std::cout<<"nRet of sqlite3_prepare: "<<nRet<<std::endl;
FILE *fp;
long filesize = 0;
char * ffile;
fp = fopen("./2.bmp","rb");
if(fp != NULL)
{
fseek(fp,SEEK_END);
filesize = ftell(fp);
fseek(fp,SEEK_SET);
ffile = new char[filesize+1];
size_t sz = fread(ffile,sizeof(char),filesize+1,fp);
fclose(fp);
}
//sqlite3_bind_xxx 函数第一个参数是sqlite3_prepare 后的sqlite3_stmt 指针变量
//第二个参数是列的索引（从索引0开始）
sqlite3_bind_blob(stat,1,ffile,filesize,NULL);
delete(ffile);
sqlite3_bind_int(stat,2,100);
sqlite3_step(stat);
//每次调用sqlite3_prepare 函数sqlite 会重新开辟sqlite3_stmt空间，
//所以在使用同一个sqlite3_stmt 指针再次调用sqlite3_prepare 前
sqlite3_finalize(stat);
//--------------------------------------
sqlite3_prepare(db,"select * from list;",0);
//在调用sqlite3_column_count获取查询结果列信息的时候不需要先执行sqlite3_step就可以获取
int nColNum = sqlite3_column_count(stat);
std::cout<<"total column: "<<nColNum<<std::endl;
int r = sqlite3_step(stat);
//在调用sqlite3_column_type 和sqlite3_column_name获取列类型和列名称信息前需要先执行sqlite3_step
/*
#define sqlITE_INTEGER 1
#define sqlITE_FLOAT 2
#define sqlITE_TEXT 3
#define sqlITE_BLOB 4
#define sqlITE_NULL 5
*/
int colType = sqlite3_column_type(stat,0);
std::cout<<"type of column 0 : "<<colType<<std::endl;
const char *pchColName = sqlite3_column_name(stat,0);
std::cout<<"col name of column 0 : "<<pchColName<<std::endl;
colType = sqlite3_column_type(stat,1);
std::cout<<"type of column 1 : "<<colType<<std::endl;
pchColName = sqlite3_column_name(stat,1);
std::cout<<"col name of column 1 : "<<pchColName<<std::endl;
colType = sqlite3_column_type(stat,2);
std::cout<<"type of column 2 : "<<colType<<std::endl;
pchColName = sqlite3_column_name(stat,2);
std::cout<<"col name of column 2 : "<<pchColName<<std::endl;
colType = sqlite3_column_type(stat,3);
std::cout<<"type of column 3 : "<<colType<<std::endl;
pchColName = sqlite3_column_name(stat,3);
std::cout<<"col name of column 3 : "<<pchColName<<std::endl;
while(r == sqlITE_ROW)
{
const void * test = sqlite3_column_blob(stat,1);
int size = sqlite3_column_bytes(stat,1);
sprintf(buffer2,"%s",test);
FILE *fp2;
fp2 = fopen("outfile.bmp","wb");
if(fp2 != NULL)
{
size_t ret = fwrite(test,size,fp2);
fclose(fp2);
}
const unsigned char * ptest = sqlite3_column_text(stat,0);
std::cout<<ptest<<std::endl;
int ntest = sqlite3_column_int(stat,2);
std::cout<<ntest<<std::endl;
int ntest1 = sqlite3_column_int(stat,3);
std::cout<<ntest1<<std::endl;
r = sqlite3_step(stat);
}
sqlite3_finalize(stat);
sqlite3_close(db);
return 0;
}
return 0;}
原文链接：https://www.f2er.com/sqlite/202812.html