在MyBatis中,要将LocalDateTime类型映射到数据库字段,需要使用TypeHandler来处理。以下是一个示例:
import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.time.LocalDateTime;
public class LocalDateTimeTypeHandler extends BaseTypeHandler<LocalDateTime> {
@Override
public void setNonNullParameter(PreparedStatement ps, int i, LocalDateTime parameter, JdbcType jdbcType) throws SQLException {
ps.setTimestamp(i, Timestamp.valueOf(parameter));
}
@Override
public LocalDateTime getNullableResult(ResultSet rs, String columnName) throws SQLException {
Timestamp timestamp = rs.getTimestamp(columnName);
if (timestamp != null) {
return timestamp.toLocalDateTime();
}
return null;
}
@Override
public LocalDateTime getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
Timestamp timestamp = rs.getTimestamp(columnIndex);
if (timestamp != null) {
return timestamp.toLocalDateTime();
}
return null;
}
@Override
public LocalDateTime getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
Timestamp timestamp = cs.getTimestamp(columnIndex);
if (timestamp != null) {
return timestamp.toLocalDateTime();
}
return null;
}
}
<typeHandlers>
<typeHandler handler="com.example.LocalDateTimeTypeHandler"/>
</typeHandlers>
<resultMap id="resultMap" type="com.example.MyEntity">
<id property="id" column="id" jdbcType="BIGINT"/>
<result property="createDate" column="create_date" jdbcType="TIMESTAMP" javaType="java.time.LocalDateTime" typeHandler="com.example.LocalDateTimeTypeHandler"/>
</resultMap>
这样就可以将LocalDateTime类型映射到数据库字段,并且通过自定义的TypeHandler来处理。
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