Time-related functions for getting started with MySQL-Mysql Tutorial-php.cn

Time-related functions for getting started with MySQL

黄舟

Release： 2017-01-19 15:46:17

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The binary protocol 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 Section 25.2.5, “Data Types for C API Prepared Statements”.

To send temporary data values, you can use mysql_stmt_prepare() to create a prepared statement. Then, before calling mysql_stmt_execute() to execute the statement, you can use the following steps to set each temporary parameter:

In the MYSQL_BIND structure related to the data value, set the buffer_type member to the corresponding type, which specifies The type of temporary value sent. 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.

Set the buffer member of the MYSQL_BIND structure to the address of the MYSQL_TIME structure used to pass temporary values.

Fill the members of the MYSQL_TIME structure to match the type of temporary support intended to be passed.

Use mysql_stmt_bind_param() to bind parameter data to the statement. Mysql_stmt_execute() can then be called.

To retrieve a temporary value, follow similar steps, but set the buffer_type member to the type of value you intend to accept, and set the buffer member to the address of the MYSQL_TIME structure into which the return value should be placed. . After calling mysql_stmt_execute() and before getting the results, use mysql_bind_results() to bind the buffer to the statement.

Look at the code specifically:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#include <mysql/mysql.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <termios.h>
#include <mysql/mysql.h>
int main()
{
    int         ret = 0, status = 0;
    MYSQL       *mysql;
    MYSQL_RES   *result;
    mysql =mysql_init(NULL);
    mysql =mysql_real_connect(mysql, "localhost", "root", "123456", "mydb2", 0, NULL, CLIENT_MULTI_STATEMENTS );
    if (mysql == NULL)
    {
        ret = mysql_errno(mysql);
        printf("%s", mysql_error(mysql));
        printf("func mysql_real_connect() err :%d\n", ret);
        return ret;
    }
    else
    {
        printf(" ok......\n");
    }
    MYSQL_TIME  ts;
    MYSQL_BIND  bind[3];
    MYSQL_STMT  *stmt;
     //注意：
     // 创建的表语句
     // create table test_table (date_field date,  time_field time,  timestamp_field timestamp );
    char query[1024] = "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(stmt, 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);
    // Close the statement //
    if (mysql_stmt_close(stmt))
    {
      fprintf(stderr, " failed while closing the statement\n");
      fprintf(stderr, " %s\n", mysql_stmt_error(stmt));
      exit(0);
    }
    mysql_close(mysql);
}

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