Java 常用工具类(35) : json转表结构ddl


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" +"        }";
}

MysqlUtil


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");}}
}