[英]How to check a query in CodeIgniter 3.0.3 (delete,update,select,insert)?
I have a project in codeigniter 2.0 and I used: 我在codeigniter 2.0中有一个项目,我使用过:
$query = $this->db->query('select * FROM my_table');
if($query->num_rows()==1) return true; else return false;
But in codeigniter 3.0.3 i don't know how to check (update, select, insert, delete... ). 但是在codeigniter 3.0.3中,我不知道如何检查(更新,选择,插入,删除...)。
for insert,update 用于插入,更新
$this->db->affected_rows();
Displays the number of affected rows, when在以下情况下显示受影响的行数
doing “write” type queries (insert, update, etc.). 执行“写入”类型查询(插入,更新等)。
if ( $this->db->affected_rows() > 0 )
{
return TRUE;
}
else
{
return FALSE;
}
for select 供选择
doing “select” type queries (insert, update, etc.). 执行“选择”类型查询(插入,更新等)。
if ($query->num_rows() > 0)
{
$dataSet = $query->result();
}
for delete 删除
$res = $this->a_model->delete_product($id); // example delete
if($res == FALSE)
{
}else
{
}
$query = $this->db->query("SELECT * FROM my_table");
$dataSet = array();
if ($query->num_rows() > 0)
{
$dataSet = $query->result();
}
print_r($dataSet);
From the Cogidignitor User Guide 3: 来自《 Cogidignitor用户指南》 3:
For Select: 对于选择:
The number of rows returned by the query. 查询返回的行数。 Note: In this example, $query is the variable that the query result object is assigned to:
注意:在此示例中,$ query是查询结果对象分配给的变量:
$query = $this->db->query('SELECT * FROM my_table');
if($query->num_rows() > 0){
return true;
}
else{
return false;
}
For UPDATE & INSERT Statements: 对于UPDATE&INSERT语句:
$this->db->affected_rows()
Displays the number of affected rows, when doing “write” type queries (insert, update, etc.).
在执行“写入”类型查询(插入,更新等)时,显示受影响的行数。
Example: 例:
$this->db->update('UPDATE statement');
$this->db->affected_rows();
$this->db->insert('INSERT statement');
$this->db->affected_rows();
Alternate for INSERT: 替代INSERT:
You can also use last insert id as like: 您还可以使用最后一个插入ID,例如:
$this->db->insert('INSERT statement');
$id = $this->db->insert_id();
if($id > 0){
return true;
}
else{
return false;
}
For Delete: 对于删除:
DELETE always return the true in result if query executed else false, affected_rows will also return same: 如果查询执行否则DELETE总是返回结果为true,否则返回false,受影响的行也将返回相同的结果:
$this->db->delete('DELETE statement');
if($this->db->affected_rows()){
return true;
}
else{
return false;
}
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