使用JdbcTemplate进行动态查询

Question

我有一个关于使用JdbcTemplate进行动态查询的问题。

我的代码如下：

String insertQueries = "INSERT INTO " + tablename;

StringJoiner joiner = new StringJoiner(",");
StringJoiner joiner1 = new StringJoiner(",");
StringJoiner joiner2 = new StringJoiner(",");

while (mapIterator.hasNext()) {
        Map.Entry mapEntry = (Map.Entry) mapIterator.next();
        key = joiner.add((String) mapEntry.getKey()).toString();
        // value = joiner1.add("\"" + (String) mapEntry.getValue() + "\"").toString();
        value = joiner1.add("\"" + (String) mapEntry.getValue() + "\"").toString();
        value1 = joiner2.add("?").toString();
}

insertQueries += " (" + key + ")";
insertQueries += " VALUES ("+value1+")" ;

int row = jdbcTemplate.update(insertQueries, value);

现在，我的问题是，我想要与插入查询中的自动生成问号相同数量的“值”。

现在，值变量考虑为一个字符串，因此，如果我有2个或更多问号，则在值变量中只有一个用逗号分隔的完整字符串，因此它不起作用。

见下面我的查询：

INSERT INTO tablename (fname, lname) VALUES ("abc, xyz") ;

我想要如下：

INSERT INTO tablename (fname, lname) VALUES ("abc", "xyz") ;

Answer 1

**StringJoiner joiner2 = new StringJoiner(",", "(", ")");**
while (mapIterator.hasNext()) {

 //change in value1 as
value = "\"" + (String) mapEntry.getValue() +  "\"";
 value1 = joiner2.add(value);
 myvalue = joiner2.add("?");

}

 //change  insertQueries  as with value as (? ,?)
insertQueries += " VALUES "+ myvalue+"" ;


//get value1 as  ("abc", "xyz")

//update query as
int row = jdbcTemplate.update(insertQueries, value1);