package com.ff.base.handler;

import com.alibaba.fastjson2.JSON;
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;

/**
 * mybatis json字段转换
 *
 * @author cengy
 */
public class JsonHandler<T> extends BaseTypeHandler<T> {
    private final Class<T> type;


    public JsonHandler(Class<T> type) {
        if (type == null) {
            throw new IllegalArgumentException("Type argument cannot be null");
        }
        this.type = type;
    }

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, T parameter, JdbcType jdbcType) throws SQLException {
        ps.setString(i, JSON.toJSONString(parameter));
    }

    @Override
    public T getNullableResult(ResultSet rs, String columnName) throws SQLException {
        String json = rs.getString(columnName);
        if (json != null) {
            return JSON.parseObject(json, type);
        }
        return null;
    }

    @Override
    public T getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        String json = rs.getString(columnIndex);
        if (json != null) {
            return JSON.parseObject(json, type);
        }
        return null;
    }

    @Override
    public T getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        String json = cs.getString(columnIndex);
        if (json != null) {
            return JSON.parseObject(json, type);
        }
        return null;
    }
}