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<title>Describe c/c语言连接mysql here.</title>
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<h1>
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title="Permalink to Describe c/c语言连接mysql here.">
Describe c/c语言连接mysql here.
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<span class="label">Date</span>
<abbr class="published" title="2013-08-09T00:00:00">
<i class="icon-calendar"></i>五 09 八月 2013
</abbr>
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<a href="http://liugehao.github.io/author/liugehao.html"><i class="icon-user"></i>liugehao</a>
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<p>{{{
apt-get install libmysqlclient-dev
}}}
{{{#!highlight sql
create table t1( id integer auto_increment primary key ,name varchar(20), sex char[1]);
}}}
mysql.c文件：
{{{#!highlight c</p>
<h1>include <stdio.h></h1>
<h1>include <stdlib.h></h1>
<h1>include <string.h></h1>
<h1>include <mysql/mysql.h></h1>
<h1>define MAX_COLUMN_LEN 32</h1>
<p>int main(int argc, char <em>argv[])
{
MYSQL my_connection;
MYSQL_RES </em>result;
MYSQL_ROW sql_row;
MYSQL_FIELD <em>fd;
char column[MAX_COLUMN_LEN][MAX_COLUMN_LEN];
int res;
mysql_init(&my_connection);
if(mysql_real_connect(&my_connection, "127.0.0.1", "root", "liuyou", "test1", 3306, NULL, 0))
{
perror("Connect");
res = mysql_query(&my_connection, "select * from t1");
if(!res)
{
result = mysql_store_result(&my_connection);
if(result)
{
int i,j;
printf("the result nuber is %lu\n", (unsigned long)mysql_num_rows(result));
for(i=0;fd=mysql_fetch_field(result);i++)
{
bzero(column[i], sizeof(column[i]));
strcpy(column[i], fd->name);
}
j = mysql_num_fields(result);
for(i=0;i<j;i++)
{
printf("%s\t", column[i]);
}
printf("\n");
while(sql_row=mysql_fetch_row(result))
{
for(i=0;i<j;i++)
{
printf("%s\t",sql_row[i]);
}
printf("\n");
}
}
}
else
{
perror("select");
}
}
else
{
perror("connect:error");
}
//mysql_free_result(MYSQL_RES </em>result);//释放结果资源
mysql_free_result(result); //先释放，后插入</p>
<div class="highlight"><pre><span class="kt">char</span> <span class="o">*</span><span class="n">name</span><span class="p">,</span> <span class="n">sql</span><span class="p">[</span><span class="mi">100</span><span class="p">];</span>
<span class="kt">char</span> <span class="n">sex</span><span class="p">;</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">malloc</span><span class="p">(</span><span class="mi">10</span><span class="p">);</span>
<span class="n">printf</span><span class="p">(</span><span class="s">"请输入名字:"</span><span class="p">);</span>
<span class="n">gets</span><span class="p">(</span><span class="n">name</span><span class="p">);</span>
<span class="n">printf</span><span class="p">(</span><span class="s">"性别:"</span><span class="p">);</span>
<span class="n">gets</span><span class="p">(</span><span class="o">&</span><span class="n">sex</span><span class="p">);</span>
<span class="n">sprintf</span><span class="p">(</span><span class="n">sql</span><span class="p">,</span> <span class="s">"insert into test1.t1 values (null,'%s', '%c');"</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">sex</span><span class="p">);</span>
<span class="n">printf</span><span class="p">(</span><span class="n">sql</span><span class="p">);</span>
<span class="n">mysql_query</span><span class="p">(</span><span class="o">&</span><span class="n">my_connection</span><span class="p">,</span> <span class="n">sql</span><span class="p">);</span>
<span class="n">mysql_commit</span><span class="p">(</span><span class="o">&</span><span class="n">my_connection</span><span class="p">);</span>
<span class="n">mysql_close</span><span class="p">(</span><span class="o">&</span><span class="n">my_connection</span><span class="p">);</span>
</pre></div>
<p>}
}}}</p>
<p>编译：
{{{
l@x201i:~/tmp/gcc$ gcc mysql.c && ./a.out
/tmp/ccdPMZug.o: In function <code>main':
mysql.c:(.text+0x23): undefined reference to</code>mysql_init'
mysql.c:(.text+0x5e): undefined reference to <code>mysql_real_connect'
mysql.c:(.text+0x85): undefined reference to</code>mysql_query'
mysql.c:(.text+0xa1): undefined reference to <code>mysql_store_result'
mysql.c:(.text+0xbc): undefined reference to</code>mysql_num_rows'
mysql.c:(.text+0x12e): undefined reference to <code>mysql_fetch_field'
mysql.c:(.text+0x145): undefined reference to</code>mysql_num_fields'
mysql.c:(.text+0x1e3): undefined reference to <code>mysql_fetch_row'
mysql.c:(.text+0x212): undefined reference to</code>mysql_free_result'
mysql.c:(.text+0x2ad): undefined reference to <code>mysql_query'
mysql.c:(.text+0x2bc): undefined reference to</code>mysql_commit'
mysql.c:(.text+0x2cb): undefined reference to `mysql_close'
collect2: error: ld returned 1 exit status</p>
<p>}}}
出错，增加 -l mysqlclient
{{{
l@x201i:~/tmp/gcc$ gcc mysql.c -l mysqlclient && ./a.out
}}}</p>
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