import
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate
声明NamedParameterJdbcTemplate类型的成员变量
@Autowired
private lateinit var jt: NamedParameterJdbcTemplate
各种用法
fun queryStudentList(): List<Student> {
return jt.jdbcTemplate.query("""SELECT id, name
| FROM t_student""".trimMargin()) { rs, _ ->
Student(id = rs.getInt(1),
name = rs.getString(2))
}
}
// 命名参数
fun queryStudentList2(gender: String): List<Student> {
return jt.query("""SELECT id, name
| FROM t_student
| WHERE gender=:gender""".trimMargin(),
MapSqlParameterSource("gender", gender)) { rs, _ ->
Student(id = rs.getInt(1),
name = rs.getString(2))
}
}
// 参数？
fun queryStudentList3(gender: String): List<Student> {
return jt.jdbcTemplate.query("""SELECT id, name
| FROM t_student
| WHERE gender=?""".trimMargin(),
arrayOf(gender)) { rs, _ ->
Student(id = rs.getInt(1),
name = rs.getString(2))
}
}
fun queryStudent(id: Int): Student? {
return jt.jdbcTemplate.query<Student>("""SELECT id, name
| FROM t_student
| WHERE id=?""".trimMargin(),
arrayOf(id)) { rs ->
if (rs.next()) {
Student(id = rs.getInt(1),
name = rs.getString(2))
} else null
}
}
fun queryStudent2(id: Int): Student? {
return jt.query<Student>("""SELECT id, name
| FROM t_student
| WHERE id=:id""".trimMargin(),
mapOf("id" to id)) { rs ->
if (rs.next()) {
Student(id = rs.getInt(1),
name = rs.getString(2))
} else null
}
}
fun doesStudentExist(id: Int): Boolean {
return jt.jdbcTemplate.query<Boolean>("""SELECT id
| FROM t_student
| WHERE id=?""".trimMargin(),
arrayOf(id), ResultSet::next)!!
}
