使用JdbcTemplate进行动态查询
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") ;
回答:
**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);
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