sqlite3 get data from table c
#include <stdio.h>
#include <string>
using std::string;
#include <sstream>
using std::stringstream;
#include "sqlite3.h"
bool find_employee(int _id)
{
bool found = false;
sqlite3* db;
sqlite3_stmt* stmt;
stringstream ss;
// create sql statement string
// if _id is not 0, search for id, otherwise print all IDs
// this can also be achieved with the default sqlite3_bind* utilities
if(_id) { ss << "select * from employees where id = " << _id << ";"; }
else { ss << "select * from employees;"; }
string sql(ss.str());
//the resulting sql statement
printf("sql: %sn", sql.c_str());
//get link to database object
if(sqlite3_open("data/test.db", &db) != SQLITE_OK) {
printf("ERROR: can't open database: %sn", sqlite3_errmsg(db));
sqlite3_close(db);
return found;
}
// compile sql statement to binary
if(sqlite3_prepare_v2(db, sql.c_str(), -1, &stmt, NULL) != SQLITE_OK) {
printf("ERROR: while compiling sql: %sn", sqlite3_errmsg(db));
sqlite3_close(db);
sqlite3_finalize(stmt);
return found;
}
// execute sql statement, and while there are rows returned, print ID
int ret_code = 0;
while((ret_code = sqlite3_step(stmt)) == SQLITE_ROW) {
printf("TEST: ID = %dn", sqlite3_column_int(stmt, 0));
found = true;
}
if(ret_code != SQLITE_DONE) {
//this error handling could be done better, but it works
printf("ERROR: while performing sql: %sn", sqlite3_errmsg(db));
printf("ret_code = %dn", ret_code);
}
printf("entry %sn", found ? "found" : "not found");
//release resources
sqlite3_finalize(stmt);
sqlite3_close(db);
return found;
}