Java 常用工具类(35) : json转表结构ddl

java 复制代码

import com.alibaba.fastjson.JSONObject;
import com.alibaba.gts.flm.base.util.MysqlUtil;
import com.alibaba.gts.flm.base.util.StringUtils;

import java.util.Set;

public class Json转表结构 {

    private static JSONObject j;

    public static void main(String[] args) {
        j = JSONObject.parseObject(s);

        Set<String> keys = j.keySet();

        StringBuffer ddl = new StringBuffer();
        ddl.append("CREATE TABLE lkyw_vehicle_info (\n" +
                "  `pkid` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键id',\n" +
                "  `create_time` datetime DEFAULT NULL COMMENT '创建时间',\n" +
                "  `modify_time` datetime DEFAULT NULL COMMENT '修改时间',\n");
        // 遍历键并获取其类型
        for (String key : keys) {
            Class<?> keyType = j.get(key).getClass();
            String xhx = StringUtils.tuoFengToxiaHuaXian(key);
            ddl.append("  `" + xhx + "` " + MysqlUtil.getMysqlType(getJavaObject(keyType.toString())) + " DEFAULT NULL COMMENT '" + "" + "',\n");
        }

        ddl.append(
                "  PRIMARY KEY (`pkid`)\n" +
                        ") ENGINE=InnoDB DEFAULT CHARSET=utf8mb3 COMMENT='';");
        System.out.println(ddl);
    }

    public static String getJavaObject(String kt) {
        switch (kt) {
            case "java.lang.String":
                return "String";
            case "java.lang.Integer":
            case "java.lang.Long":
                return "Long";
            case "java.lang.Float":
            case "java.lang.Double":
            case "class java.math.BigDecimal":
                return "Double";
            default:
                break;
        }
        return "String";
    }

    public static String s = "{\n" +
            "            \"age\": \"6\",\n" +
            "            \"name\": \"张三\",\n" +
            "            \"speed\": 553.8017520000001,\n" +
            "            \"lng\": 103.980244,\n" +
            "            \"lat\": 30.694589\n" +
            "        }";
}

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MysqlUtil

java 复制代码

import java.util.LinkedList;
import java.util.List;

/**
 * @Author: liyue
 * @Date: 2022/08/17/11:39
 * @Description:
 */
public class MysqlUtil {
    public static final List<String> types = new LinkedList<String>() {{
        add("tinyint");
        add("int");
        add("integer");
        add("bigint");
        add("float");
        add("double");
        add("char");
        add("varchar");
        add("datetime");
        add("text");
    }};

    public static String getJavaType(String mysqlType) {
        switch (mysqlType) {
            case "tinyint":
            case "int":
            case "integer":
                return "Integer";
            case "bigint":
                return "Long";
            case "float":
                return "Float";
            case "double":
                return "Double";
            case "text":
            case "char":
            case "varchar":
            case "datetime":
                return "String";
            default:
                throw new RuntimeException("未找到与java映射的类型");
        }
    }

    public static String getMysqlType(String javaType) {
        switch (javaType) {
            case "String":
                return "varchar(100)";
            case "Long":
                return "bigint";
            case "Double":
                return "double";
            case "double":
                return "Double";
            default:
                throw new RuntimeException("未找到与mysql映射的类型");
        }
    }
}

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StringUtils