如何使用knex使用"Insert ... ON DUPLICATE KEY UPDATE"添加多行

Question

所以我最近一直在玩knex,但是我发现自己处于一种我不知道该怎么办的情况.

所以我有这个问题:

knex.raw("INSERT INTO tablename (`col1`, `col2`, `col3`) VALUES (?, ?, ?) 
ON DUPLICATE KEY UPDATE col2 = VALUES(`col2`)", 
[
    ['val1', 'hello', 'world'],
    ['val2', 'ohayo', 'minasan'],
]);

由于某些原因,它给我一个错误Expected 2 bindings, saw 3.

我试过去做:

knex.raw("INSERT INTO tablename (`col1`, `col2`, `col3`) VALUES (?, ?, ?) 
ON DUPLICATE KEY UPDATE col2 = VALUES(`col2`)", 
    ['val1', 'hello', 'world'],
    ['val2', 'ohayo', 'minasan'],
);

这次没有错误,但它只插入第一个数组.

我也尝试将值设为对象:

[
    {col1: 'val1', col2: 'hello', col3: 'world'},
    {col1: 'val2', col2: 'ohayo', col3: 'minasan'},
]

但仍然没有运气.

Answer 1

我编写此代码以插入/更新单行作为对象或多行作为对象数组:

function insertOrUpdate(knex: Knex, tableName: string, data: any) {
  const firstData = data[0] ? data[0] : data;
  return knex.raw(knex(tableName).insert(data).toQuery() + " ON DUPLICATE KEY UPDATE " +
    Object.getOwnPropertyNames(firstData).map((field) => `${field}=VALUES(${field})`).join(", "));
}

Answer 2

如果您一次只需要插入一个固定编号的行，您可以试试这个：

knex.raw("INSERT INTO tablename (`col1`, `col2`, `col3`) VALUES (?, ?, ?), (?, ?, ?) ON DUPLICATE KEY UPDATE col2 = VALUES(`col2`)", 
    ['val1', 'hello', 'world', 'val2', 'ohayo', 'minasan'],
);

如果您不知道一次需要插入多少次，则可以编写一个脚本，(?, ?, ?),根据需要添加多次。

var questionMarks = "";
var values = [];
var rows = [
    {col1: 'val1', col2: 'hello', col3: 'world'},
    {col1: 'val2', col2: 'ohayo', col3: 'minasan'},
];
rows.forEach(function(value, index){
    questionMarks += "("
    Object.keys(value).forEach(function(x){
         questionMarks += "?, ";
         values.push(value[x]);
    });
    questionMarks = questionMarks.substr(0, questionMarks.length - 2);
    questionMarks += "), ";
});
questionMarks = questionMarks.substr(0, questionMarks.length - 2); //cut off last unneeded comma and space
knex.raw("INSERT INTO tablename (`col1`, `col2`, `col3`) VALUES " + questionMarks + " ON DUPLICATE KEY UPDATE col2 = VALUES(`col2`)", values);