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2025-09-20 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Internet Technology >
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这篇文章给大家介绍JdbcTemplate怎么在Kotlin中使用,内容非常详细,感兴趣的小伙伴们可以参考借鉴,希望对大家能有所帮助。
import
import org.springframework.beans.factory.annotation.Autowiredimport org.springframework.jdbc.core.namedparam.MapSqlParameterSourceimport 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 { 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 { 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 { 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("""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("""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("""SELECT id | FROM t_student | WHERE id=?""".trimMargin(), arrayOf(id), ResultSet::next)!! }关于JdbcTemplate怎么在Kotlin中使用就分享到这里了,希望以上内容可以对大家有一定的帮助,可以学到更多知识。如果觉得文章不错,可以把它分享出去让更多的人看到。
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