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POmysql prepared statement : Update query
 

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    <p>I am trying to execute a C program, using mysql C API, connecting to mysql with an update query and I am not getting any compilation or linking errors , but rows are not getting updated in the db table.</p> <p>When I run this code I am getting empty values updated in emp. status field</p> <pre><code>#define STRING_SIZE 256 char* eStatus,myeStatus; int myempid,empid; int i; for(i = 0; i &lt; 5 ; i++){ const char* sqlQuery = "update employee_info set estatus = ? where empID = ?"; if (mysql_stmt_prepare(stmt, sqlQuery, strlen(sqlQuery))) { fprintf(stderr, " mysql_stmt_prepare(), update failed\n"); fprintf(stderr, " %s\n", mysql_stmt_error(stmt)); return -1; } memset(param, 0, sizeof(param)); /* zero the structures */ if (info.state == 2) eStatus = "present"; else eStatus = "absent"; empid = i; // Init param structure // Select param[0].buffer_type = MYSQL_TYPE_STRING; param[0].buffer = (void *) &amp;eStatus; param[0].buffer_length = STRING_SIZE; param[0].is_null = 0; param[0].length = &amp;str_length; param[1].buffer_type = MYSQL_TYPE_SHORT; param[1].buffer = (void *) &amp;myempID; param[1].buffer_length = STRING_SIZE; param[1].is_null = 0; param[1].length = 0; myeStatus = eStatus; myempid = empid; if (mysql_stmt_bind_param(stmt, param) != 0) { fprintf(stderr, " mysql_stmt_bind_param() failed\n"); fprintf(stderr, " %s\n", mysql_stmt_error(stmt)); return -1; } /* Execute the statement */ if (mysql_stmt_execute(stmt)) { fprintf(stderr, " mysql_stmt_execute(), failed\n"); fprintf(stderr, " %s\n", mysql_stmt_error(stmt)); return -1; } } // end of for loop </code></pre> <p>Table schema in mysql</p> <p>empid INT(11)</p> <p>estatus varchar(10)</p> <p>I am not able to figure out why status is not getting updated in mysql table. Is it a mismatch of datatypes, or values are not binded properly to sqlquery?<br> Any clue? Thanks.</p>
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