linux編程mysql

使用mysql的root登入後設置

mysql -u root -p

先創建新的數據庫

create database db1;

建立db數據庫的用戶

grant all on.* to dbuser1 identified by '123456';

退出

quit

使用新用戶登入

mysql -u dbuser1 -p

use db1

create table table3 (id int primary key auto_increment, name varchar(20), age int)

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <error.h>
#include <mysql/mysql.h>

#define BUFSIZE 1024

MYSQL mysql;
MYSQL *connection;

void leselect()
{
	char sql[BUFSIZE];
	memset(sql, 0, sizeof(sql));
	strcpy(sql, "please input select SQL\n");
	write(STDOUT_FILENO, sql, strlen(sql));
	char name[BUFSIZE];
	memset(name, 0, sizeof(name));
	read(STDIN_FILENO, name, sizeof(name));
	name[strlen(name)-1] = 0;
	memset(sql, 0, sizeof(sql));
	sprintf(sql, "select * from table3 where name = '%s'",name);
	if(mysql_query(connection, sql) != 0)
	{
		printf("select failed");
	}
	MYSQL_RES *result = mysql_store_result(connection);
	MYSQL_FIELD *field;
	MYSQL_ROW row;
	int count = 0;
	while(1)
	{
		field = mysql_fetch_field(result);
		if(field == NULL)
			break;
		printf("%s\t",field->name);
		count ++;
	}
	printf("\n");
	while(1)
	{
		row = mysql_fetch_row(result);
		if( row == NULL)
			break;
		int i;
		for(i =0; i<count; i++)
		{
			printf("%s\t",(const char*)row[i]);
		}
		printf("\n");
	}
	mysql_free_result(result);

}

void insert()
{
	char sql[BUFSIZE];
	memset(sql, 0, sizeof(sql));
	strcpy(sql, "please input insert SQL is name and age\n");
	write(STDOUT_FILENO, sql, strlen(sql));
	
	char name[BUFSIZE];
	memset(name, 0, sizeof(name));
	read(STDIN_FILENO, name, sizeof(name));
	name[strlen(name)-1] = 0;
	memset(sql, 0, sizeof(sql));
	
	char age[BUFSIZE];
	memset(age, 0, sizeof(age));
	read(STDIN_FILENO, age, sizeof(age));
	age[strlen(age)-1] = 0;
	
	sprintf(sql, "insert into table3 (name,age)values('%s', '%s');",name,age);	
	printf("%s",sql);
	if(mysql_query(connection, sql) != 0)
	{
		printf("insert failed\n");
	}else
	{
		printf("insert success\n");
	}
}
void delete()
{
	char sql[BUFSIZE];
	memset(sql, 0, sizeof(sql));
	strcpy(sql, "please input delete name\n");
	write(STDOUT_FILENO, sql, strlen(sql));
	
	char name[BUFSIZE];
	memset(name, 0, sizeof(name));
	read(STDIN_FILENO, name, sizeof(name));
	name[strlen(name)-1] = 0;
	
	memset(sql, 0, sizeof(sql));
	sprintf(sql, "delete from table3 where name = '%s'",name);	
	if(mysql_query(connection, sql) != 0)
	{
		printf("success failed\n");
	}
	else
	{
		printf("delete success\n");
	}
}
void alter()
{
	char sql[BUFSIZE];
	memset(sql, 0, sizeof(sql));
	strcpy(sql, "please input update name\n");
	write(STDOUT_FILENO, sql, strlen(sql));
	
	char name[BUFSIZE];
	memset(name, 0, sizeof(name));
	read(STDIN_FILENO, name, sizeof(name));
	name[strlen(name)-1] = 0;
	
	char age[BUFSIZE];
	memset(age, 0, sizeof(age));
	read(STDIN_FILENO, age, sizeof(age));
	age[strlen(age)-1] = 0;

	memset(sql, 0, sizeof(sql));
	sprintf(sql, "update table3 set age = '%s' where name = '%s'",age,name);	
	if(mysql_query(connection, sql) != 0)
	{
		printf("update failed\n");
	}
	else
	{
		printf("update success\n");
	}
}
int main()
{	
	mysql_init(&mysql);
	connection = mysql_real_connect(&mysql, "localhost", "dbuser1", "123456", "db1", 0, 0, 0);
	if ( connection == NULL)
	{
		printf("connect failed, %s\n", mysql_error(&mysql));
		return -1;
	}
	if (  mysql_query(connection, "set names utf8") != 0)
	{
		printf("set names failed, %s\n", mysql_error(&mysql));
	}
	char buf[BUFSIZE];
	memset(buf, 0, sizeof(buf));
	strcpy(buf, "please choose\n1:insert\n2:delete\n3:alter\n4:select\n");
	write(STDOUT_FILENO, buf, strlen(buf));
	memset(buf, 0, sizeof(buf));
	read(STDIN_FILENO, buf, sizeof(buf));
	if(strncmp(buf, "4", 1) == 0)
	{	
		leselect();
	}
	if(strncmp(buf, "3", 1) == 0)
	{
		alter();
	}
	if(strncmp(buf, "2", 1) == 0)
	{
		delete();
	}
	if(strncmp(buf, "1", 1) == 0)
	{
		insert();
	}

	mysql_close(connection);
	return 0;

}

gcc -o lesql lesql.c -lmysqlclient編譯