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22.2.10 C API Handling of Date and Time Values
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The new binary protocol available in MySQL 4.1 and above allows you to
send and receive date and time values (`DATE', `TIME', `DATETIME', and
`TIMESTAMP'), using the `MYSQL_TIME' structure. The members of this
structure are described in C API Prepared statement datatypes.
To send temporal data values, you create a prepared statement with
`mysql_stmt_prepare()'. Then, before calling `mysql_stmt_execute()' to
execute the statement, use the following procedure to set up each
temporal parameter:
1. In the `MYSQL_BIND' structure associated with the data value, set
the `buffer_type' member to the type that indicates what kind of
temporal value you're sending. For `DATE', `TIME', `DATETIME', or
`TIMESTAMP' values, set `buffer_type' to `MYSQL_TYPE_DATE',
`MYSQL_TYPE_TIME', `MYSQL_TYPE_DATETIME', or
`MYSQL_TYPE_TIMESTAMP', respectively.
2. Set the `buffer' member of the `MYSQL_BIND' structure to the
address of the `MYSQL_TIME' structure in which you will pass the
temporal value.
3. Fill in the members of the `MYSQL_TIME' structure that are
appropriate for the type of temporal value you're passing.
Use `mysql_stmt_bind_param()' to bind the parameter data to the
statement. Then you can call `mysql_stmt_execute()'.
To retrieve temporal values, the procedure is similar, except that you
set the `buffer_type' member to the type of value you expect to
receive, and the `buffer' member to the address of a `MYSQL_TIME'
structure into which the returned value should be placed. Use
`mysql_bind_results()' to bind the buffers to the statement after
calling `mysql_stmt_execute()' and before fetching the results.
Here is a simple example that inserts `DATE', `TIME', and `TIMESTAMP'
data. The `mysql' variable is assumed to be a valid connection handle.
MYSQL_TIME ts;
MYSQL_BIND bind[3];
MYSQL_STMT *stmt;
strmov(query, "INSERT INTO test_table(date_field, time_field,
timestamp_field) VALUES(?,?,?");
stmt = mysql_stmt_init(mysql);
if (!stmt)
{
fprintf(stderr, " mysql_stmt_init(), out of memory\n");
exit(0);
}
if (mysql_stmt_prepare(mysql, query, strlen(query)))
{
fprintf(stderr, "\n mysql_stmt_prepare(), INSERT failed");
fprintf(stderr, "\n %s", mysql_stmt_error(stmt));
exit(0);
}
/* set up input buffers for all 3 parameters */
bind[0].buffer_type= MYSQL_TYPE_DATE;
bind[0].buffer= (char *)&ts;
bind[0].is_null= 0;
bind[0].length= 0;
...
bind[1]= bind[2]= bind[0];
...
mysql_stmt_bind_param(stmt, bind);
/* supply the data to be sent in the ts structure */
ts.year= 2002;
ts.month= 02;
ts.day= 03;
ts.hour= 10;
ts.minute= 45;
ts.second= 20;
mysql_stmt_execute(stmt);
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