Question

我有2张这样的表：

table_com
-------------
id_com|code|value|
----------------
1     |10  | A
2     |20  | B


table_b
----------
id_b|code
----------
1   |10
2   |20
3   |30

我想在table_com中插入table_b，而不是table_com中的code（根据id_b==3）插入table_a，例如table_com 1}}，因为代码= 30它不存在于table_com ------------- id_com|code|value| ----------------- 1 |10 | A 2 |20 | B 3 |30 | 0中，对于值，我需要输入0.最终的foreach ($comunas as $key => $value) { $code = $value->code; DB::select(DB::raw(" INSERT INTO rgl_clientes_comuna ( code, value ) VALUES ($code, 0,) WHERE code IS NOT $code ")); }应该是这样的：

INSERT INTO rgl_clientes_comuna (
    comuna_id,
    numero_clientes
) SELECT
    cod_comuna,
    0
FROM
    rgl_cut ON DUPLICATE KEY UPDATE comuna_id = 12201

我正在使用php，我尝试了table_b的foreach值并尝试按照我的说法插入值，但不知道该怎么做（我知道使用INSERT INTO我无法使用在哪里，这只是一个例子）：

  #include <string.h>
#include <stdio.h>

int try_null (char []); 

int main () 
{
   char a [10]; 
   char *ap = a; 
   strcpy(ap, "123.txt");  
  printf("length is %d\n", try_null(ap)); 


  //This part doesn't give me a segmentation fault  
  /*char a [10]; 
  strcpy(a, "123.txt"); 
  int counter = 0, length = strlen(a); 

    for (counter = 0; counter < length; ++counter)
    {
        if ( (a[counter] >= 48) && (a[counter] <= 57) );        //if the value is a decimal leave it 
        else 
            a[counter]='\0';                            //replace the first non decimal value with a null
    }
  length=strlen(a); 
  printf("%d\n", length); */

}

try_null(char value [10])
{
  int counter, length = strlen(value);                      //find the current length of the array
  printf("value is %d\n", length); 

  for (counter = 0; counter < length; ++counter) 
     printf("value is %c\n", value[counter]); 

    //getting rid of non-decimals
    for (counter = 0; counter < length; ++counter)
    {
        if ( (value[counter] >= 48) && (value[counter] <= 57) );        //if the value is a decimal leave it 
        else 
        {
            value[counter]='\0';                            //replace the first non decimal value with a null


        }
    }
  length=strlen(value); 
  return length; 
}

编辑：

1）对于第一个答案，我尝试了这个（用我的真实数据）：

static final String STATE_USER = "user";
private String mUser;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Check whether we're recreating a previously destroyed instance
    if (savedInstanceState != null) {
        // Restore value of members from saved state
        mUser = savedInstanceState.getString(STATE_USER);
    } else {
        // Probably initialize members with default values for a new instance
        mUser = "NewUser";
    }
}

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    savedInstanceState.putString(STATE_USER, mUser);
    // Always call the superclass so it can save the view hierarchy state
    super.onSaveInstanceState(savedInstanceState);
}

它有效，但它为table_b上的每个注册表添加了一个新行

Answer 1

我只会使用insert into a (code, value) select code, 0 from b on duplicate key update code = values(code);：

a(code)

为此，您需要{{1}}上的唯一索引/约束。

Answer 2

这个怎么样？

insert into table_com
  select id_b, code, 0
    from table_b where id_b not in (select id_com from table_com);

还是这个？

insert into table_com
  select id_b, code, 0
    from table_b where code not in (select code from table_com);

因为我不清楚决定因素是否存在id或code

Mysql，从另一个表

2 个答案: