Why use Map < String, Object > when inserting data?
@Test
public void testNamedParameterJdbcTemplate() {
String sql = "INSERT INTO employees(last_name,email,dept_id) VALUES(:ln,:email,:deptid)";
Map<String, Object> paramMap = new HashMap<>();
paramMap.put("ln", "FF");
paramMap.put("email", "FF@qq.com");
paramMap.put("deptid", 2);
namedParameterJdbcTemplate.update(sql, paramMap);
} because jdbcTemplate will eventually be assigned through the precompiled statement ps.setObject (name,value) of jdbc , where name is the attribute name, so the key of Map is the type of String , but the type of value is not known, so the Map is fine.
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