Joanne Pham wrote:
My application is used C++ to insert/select the data from this table. So if I
defined it as
create table mytable (
........
createDate REAL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (remoteWXId)
);
Then I can use sqlite3_bind_real to bind the column but what is the datatype
that I should use in C++ code.Do you have any example code that work for C++ in
this case.
Joanne,
If you define your table using the "default current_timestamp" clause,
SQLite will insert the data and time as a string, not as a floating
point real value.
sqlite> create table t(a int, b real default current_timestamp);
sqlite> insert into t(a) values(1);
sqlite> select a, b, typeof(b) from t;
a b typeof(b)
---------- ------------------- ----------
1 2007-12-17 21:56:48 text
sqlite> insert into t values(2, julianday('now'));
sqlite> select a, b, typeof(b), datetime(b) from t;
a b typeof(b) datetime(b)
---------- ------------------- ---------- -------------------
1 2007-12-17 21:56:48 text 2007-12-17 21:56:48
2 2454452.42202395 real 2007-12-17 22:07:42
SQLite calls it's internal floating point type REAL, but the C API
function used to bind such values is sqlite3_bind_double(), and it binds
a standard C or C++ double value. Some sample code is shown below. The
first inserts a julian day number directly, the second uses the
julianday() function to convert a text string inserted by the code into
a julian day number in the database.
sqlite3_stmt* s;
sqlite3_prepare_v2(db, "insert into t values(:a, :b)", -1, &s, 0);
double tomorrow = 2454453.5;
sqlite3_bind_int(s, 1, 3);
sqlite3_bind_double(s, 2, tomorrow);
sqlite3_step(s);
sqlite3_finalize(s);
sqlite3_prepare_v2(db, "insert into t values(:a, julianday(:b))",
-1, &s, 0);
char* yesterday = "2007-12-16 00:00:00";
sqlite3_bind_int(s, 1, 4);
sqlite3_bind_text(s, 2, yesterday, -1, SQLITE_STATIC);
sqlite3_step(s);
sqlite3_finalize(s);
HTH
Dennis Cote
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