连表查询 select 生成

连表查询 select 生成

结果

 select 
plan.*,
 time_slot.*,
program.*
 from plan,  plan_time_slot,
time_slot, time_slot_program,
program
  
 where plan.id = plan_time_slot.plan_id 
 and  plan_time_slot. time_slot_id = time_slot.id  
 and time_slot.id = time_slot_program.time_slot_id 
 and  time_slot_program. program_id = program.id ;

package com.gm.wj.util;

import com.gm.wj.entity.Notice;
import lombok.Data;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

@Data
public class CodeGen {
    


// public static void main(String[] args) {
    
 List<String> tableNames=new ArrayList<>();
 List<String> tableNames= Arrays.asList("plan","time_slot","program");
 int frontIdx=0;
 int linkIdx=1;
 int endIdx=2;
 String whereCode=" where ";
 for (int i = 0; i < tableNames.size(); i++) {
    
 String frontTable = tableNames.get(frontIdx);
 String linkTable = tableNames.get(linkIdx);
 String backTable = tableNames.get(endIdx);
 String linkTableName=frontTable+"_"+backTable;
 whereCode+="#frontTable#.id = #linkTableName#.#frontTable#_id ";
 whereCode+="#linkTableName#. #endTable#_id = #endTable#.id ";
 }
// List<String> tableNames= Arrays.asList("plan","time_slot","program");
// String whereCode = makeWhereCode(tableNames);
// String selectCode = makeSelectCode(tableNames);
// String fromCode = makeFromCode(tableNames);
// System.out.println(selectCode+fromCode+whereCode);
// }

    static String  makeFromCode( List<String> tableNames){
    
// List<String> tableNames= Arrays.asList("plan","time_slot","program");
        int frontIdx=0;
// int linkIdx=1;
        int backIdx=1;
// int endIdx=2;
// String whereCode=" where ";
// 0 1 2
        StringBuilder whereCode= new StringBuilder(" from ");
        String firstTable = tableNames.get(0);
        whereCode.append(firstTable).append(", ");
        for (int i = 0; i < tableNames.size(); i++) {
    
            String frontTable = tableNames.get(frontIdx);
// String linkTable = tableNames.get(backIdx);
            String backTable = tableNames.get(backIdx);
// String backTable = tableNames.get(endIdx);
            String  linkTableName=frontTable+"_"+backTable;

// whereCode.append(" #frontTable#,\n#linkTableName#,\n#backTable#,"
            whereCode.append(" #linkTableName#,\n#backTable#,"
                    .replace("#frontTable#", frontTable)
                    .replace("#backTable#", backTable)
                    .replace("#linkTableName#", linkTableName))
            ;
            frontIdx++;
            backIdx++;
            if(backIdx>=tableNames.size()){
    
                break;
            }

        }

// whereCode.rela
        whereCode = new StringBuilder(whereCode.substring(0, whereCode.length() - 1));
        whereCode.append("\n");
// whereCode= whereCode.replaceFirst("and","where");

// System.out.println(whereCode);
        return whereCode.toString();
    }

    static String  makeSelectCode( List<String> tableNames){
    
// List<String> tableNames= Arrays.asList("plan","time_slot","program");
        int frontIdx=0;
// int linkIdx=1;
        int backIdx=1;
// int endIdx=2;
// String whereCode=" where ";
        StringBuilder whereCode= new StringBuilder(" select \n");
        String firstTable = tableNames.get(0);
        whereCode.append(firstTable+".*").append(",\n ");
        List<String>codes=new ArrayList<>();
        for (int i = 0; i < tableNames.size(); i++) {
    
            String frontTable = tableNames.get(frontIdx);
// String linkTable = tableNames.get(backIdx);
            String backTable = tableNames.get(backIdx);
// String backTable = tableNames.get(endIdx);
            String  linkTableName=frontTable+"_"+backTable;
// whereCode.append(" #frontTable#.*, \n #backTable#.*,"
            codes.add(backTable+".*");
// whereCode.append(" #backTable#.*,"
// .replace("#frontTable#", frontTable)
// .replace("#backTable#", backTable)
// .replace("#linkTableName#", linkTableName))
// ;
            frontIdx++;
            backIdx++;
            if(backIdx>=tableNames.size()){
    
                break;
            }
        }
// System.out.println(codes);
        String tables = String.join(",\n", codes);
        whereCode.append(tables);
// whereCode = new StringBuilder(whereCode.substring(0, whereCode.length() - 1));
        whereCode.append("\n");
// System.out.println(whereCode);
        return whereCode.toString();
    }

    static String  makeWhereCode( List<String> tableNames){
    
// List<String> tableNames= Arrays.asList("plan","time_slot","program");
        int frontIdx=0;
// int linkIdx=1;
        int backIdx=1;
// int endIdx=2;
// String whereCode=" where ";
        StringBuilder whereCode= new StringBuilder(" ");
        for (int i = 0; i < tableNames.size(); i++) {
    
            String frontTable = tableNames.get(frontIdx);
// String linkTable = tableNames.get(backIdx);
            String backTable = tableNames.get(backIdx);
// String backTable = tableNames.get(endIdx);
            String  linkTableName=frontTable+"_"+backTable;
            whereCode.append(" \n and #frontTable#.id = #linkTableName#.#frontTable#_id \n and #linkTableName#. #backTable#_id = #backTable#.id "
                    .replace("#frontTable#", frontTable)
                    .replace("#backTable#", backTable)
                    .replace("#linkTableName#", linkTableName))
            ;
            frontIdx++;
            backIdx++;
            if(backIdx>=tableNames.size()){
    
                break;
            }

        }

        whereCode = new StringBuilder(whereCode.toString().replaceFirst("and", "where"));

// System.out.println(whereCode);
        return whereCode.toString();
    }


    public static void main(String[] args) {
    
// Notice notice = new Notice();

// String gen = gen(notice);
// System.out.println(gen);

// CodeGen codeGen = new CodeGen();
// codeGen.genAxios(notice);
 codeGen.axiosGetCode.so
// System.out.println(codeGen.axiosPostCode);

        List<String> tableNames= Arrays.asList("plan","time_slot","program");
// String whereCode = makeWhereCode(tableNames);
// String selectCode = makeSelectCode(tableNames);
// String fromCode = makeFromCode(tableNames);
// System.out.println(selectCode+fromCode+whereCode);
        String linkedTableQuery = genLinkedTableQuery(tableNames);
        System.out.println(linkedTableQuery);
    }

   static  String genLinkedTableQuery( List<String> tableNames){
    
// List<String> tableNames= Arrays.asList("plan","time_slot","program");
       String whereCode = makeWhereCode(tableNames);
       String selectCode = makeSelectCode(tableNames);
       String fromCode = makeFromCode(tableNames);
// System.out.println(selectCode+fromCode+whereCode);
       return selectCode+fromCode+whereCode+";";
   }

    String axiosGetCode;
    String axiosPostCode;

    public void genAxios(Object object) {
    
        String tableName = getTableName(object);
        String jsonAllFiled = ObjectToJson.Object2JsonAllFiled(object);

        String axiosGetCodeTpl = "axios.get( common.baseURL + \"/#tableName#\").then((resp) => {\n" +
                " if (resp && resp.code === 200) {\n" +
                " let data=resp.data.data\n" +
                " this.#tableName#=data\n"+
                " }\n" +
                " });";

        String axiosPostCodeTpl = "axios.post( common.baseURL + \"/#tableName#\",#dataForm#).then((resp) => {\n" +
                " if (resp && resp.code === 200) {\n" +
                " let data=resp.data.data\n" +
                " this.#tableName#=data\n"+
                " }\n" +
                " });";
        axiosGetCode = axiosGetCodeTpl.replace("#tableName#", tableName);
        axiosPostCode = axiosPostCodeTpl.replace("#tableName#", tableName)
                .replace("#dataForm#", jsonAllFiled);

    }

    public static String gen(Object object) {
    
        String tableName = getTableName(object);
        String jsonAllFiled = ObjectToJson.Object2JsonAllFiled(object);

        String axiosCode = "axios.get( common.baseURL + \"/#tableName#\").then((resp) => {\n" +
                " if (resp && resp.code === 200) {\n" +
                " let data=resp.data.data" +
                " }\n" +
                " });";

        String axiosPostCode = "axios.post( common.baseURL + \"/#tableName#\",#dataForm#).then((resp) => {\n" +
                " if (resp && resp.code === 200) {\n" +
                " let data=resp.data.data" +
                " }\n" +
                " });";
        String replace = axiosCode.replace("#tableName#", tableName);
        String replace1 = axiosPostCode.replace("#tableName#", tableName)
                .replace("#dataForm#", jsonAllFiled);
        return replace;
    }

// public static <T> String getTableName(T obj) {
    
// String tableName = obj.getClass().getSimpleName();
// tableName = StringUtils.underscoreNameLower(tableName);
// return tableName;
// }

    public static String getTableName(Object obj) {
    
        String tableName = obj.getClass().getSimpleName();
        tableName = StringUtils.underscoreNameLower(tableName);
        return tableName;
    }
}