JdbcTemplate不支持参数化查询'IN'的情况？必须由NamedParameterJdbcTemplate？ [英] JdbcTemplate does not support Parameterized Query 'IN' case? Must by NamedParameterJdbcTemplate?

问题描述

为防止SQL注入攻击，我的项目中的所有SQL语句代码都应该转换为参数化查询。但是当查询条件包含IN的情况时，我遇到问题。像这样（使用DB2数据库）：

Aimed at preventing SQL injection attacks, all the SQL Statement code in my project should transformed to Parameterized Query. But I got a problem when the query condition includes a 'IN' case. Like this (Using DB2 database):

String employeeId = 'D2309';
String name = "%brady%";

List<Integer> userRights = new ArrayList<Integer>();
userRights.add(1);
userRights.add(2);
userRights.add(3);

String sql = "SELECT * FROM T_EMPLOYEE WHERE EMPLOYEE_ID = ? AND NAME LIKE ? 
AND RIGHT IN (?)";

jdbcTemplate.query(sql, new Object[] {employeeId, name, userRights}, new 
EmployeeRowMapper());

上述代码运行失败，但有例外：

The above code runs failed with the exception:

org.springframework.jdbc.BadSqlGrammarException: PreparedStatementCallback; bad 
SQL grammar [SELECT * FROM T_EMPLOYEE WHERE EMPLOYEE_ID = ? AND NAME LIKE ? AND 
RIGHT IN (?)]; nested exception is com.ibm.db2.jcc.am.io: [jcc][1091][10824]
[3.57.82] .... ERRORCODE=-4461, SQLSTATE=42815

这里的问题是JdbcTemplate是否支持IN的参数化查询？我知道这个工作可以通过NamedParameterJdbcTemplate来完成，而且NamedParameterJdbcTemplate是否只能在IN情况下查询？

The question here is that does not JdbcTemplate support Parameterized Query for IN case? and I know this work can be done by NamedParameterJdbcTemplate, and whether only NamedParameterJdbcTemplate can do IN case query?

非常感谢

推荐答案

正如我在评论中已经提到的，我不满意这个解决方案，因为它动态地生成了一些SQL语句。由于 userRights 的数量在1和n之间，所以在缓存中需要n个准备好的语句。

As I already mentioned in the comments, I'm not happy with this solution as it dynamically generates a number of SQL statements. Given the number of userRights is between 1 and n, it requires up to n prepared statements in the cache.

下面的工作（我没有尝试）。

The below should work (I did not try it).

String employeeId = 'D2309';
String name = "%brady%";

List<Integer> userRights = new ArrayList<Integer>();
userRights.add(1);
userRights.add(2);
userRights.add(3);

// build the input string
StringBuilder sb = new StringBuilder();
for (int i = 0; i < userRights.size; i++) {
    sb.append("?");
    if (i < userRights.size() - 1) {
        sb.append(", ");
    }
}

// build the SQL
String sql = "SELECT * FROM T_EMPLOYEE WHERE EMPLOYEE_ID = ?" +
    " AND NAME LIKE ?" +
    " AND RIGHT IN (" + sb.toString() + ")";

// init the object array
// size is employeeId + name + right
Object[] param = new Object[2 + userRights.size()];

// fill it
param[0] = employeeId;
param[1] = name;

for (int i = 0; i < userRights.size(); i++) {
    param[i + 2] = userRights.get(i);
}

jdbcTemplate.query(sql, param, new EmployeeRowMapper());

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