标签:operations Java String 组装 equals next sql SQL condition
第一版
package com.zh.oukele.util; import java.util.HashMap; import java.util.Iterator; import java.util.Map; public class CreateSqlUtil { public static void main(String[] args) { Map<String ,Object> map = new HashMap<>(); map.put("stuName","欧可乐"); map.put("stuAge",20); map.put("stuSex","男"); map.put("Key_stuId","ASDF"); map.put("Key_stuSex","ASDF"); try { System.out.println(getSql("table_name", "delete", map, false, "")); } catch (Exception e) { e.printStackTrace(); } } /** * 动态组装 简单sql语法 * @param tableName 表名 * @param operation 操作标识符 select|delete|update ,默认为 select * @param mapData 数据的map集合 * @param useMySQL true|false , false 为使用动态组装SQL,true为使用自已的sql * @param mySql 自已的sql * 注意:update 这里,where xxx = xxx ,的时候,mapData 里的键必须要有 Key_ 前缀(其他的 并不影响到) * * @return * @throws Exception */ public static String getSql(String tableName, String operation, Map<?,?> mapData,boolean useMySQL,String mySql) throws Exception { String sql = null; // 使用组装sql的功能 if( !useMySQL){ if( !(tableName != null && !tableName.equals("") && tableName.length() > 0 ) ){ throw new Exception(" 参数 tableName 的值为空!"); }else if( !(mapData != null && !mapData.equals("") && mapData.size() > 0 ) ){ throw new Exception(" 参数 mapData 的值为空!"); } // 操作标识 默认为 select String operations = "select"; String condition = " a.* from " + tableName + " a where "; if( operation != null && !operation.equals("") ){ if( operation.equals("update") || operation.equals("UPDATE") ){ operations = "update"; condition = " " + tableName + " a set "; }else if( operation.equals("delete") || operation.equals("DELETE") ){ operations = "delete"; condition = " from " + tableName + " a where "; }else if( operation.equals("insert") || operation.equals("INSERT") ){ operations = "insert"; condition = " into " + tableName + " values ("; String link = ""; Iterator<?> iterator = mapData.keySet().iterator(); while (iterator.hasNext()) { String next = (String) iterator.next(); condition += link + next; link = ","; } condition += ") values( "; } } String value= ""; String link =""; String keyValueOperations = " where "; Iterator<? extends Map.Entry<?, ?>> iterator = mapData.entrySet().iterator(); while (iterator.hasNext()) { Map.Entry<?, ?> next = iterator.next(); if( next.getValue() instanceof String ){ value = "'" + next.getValue() +"'"; }else { value = "" + next.getValue() +""; } if( next.getKey().toString().lastIndexOf("Key_") == -1 ){ if( !operations.equals("insert")){ if( operations.equals("select") || operations.equals("delete")){ condition += link + "a." + next.getKey(); condition += "=" + value; link = " and "; }else { condition += link + "a." + next.getKey(); condition += "=" + value; link = ","; } }else { condition += link + value; link = ","; } }else { continue; } } // 组装 insert sql 的结尾 if( operations.equals("insert") ){ condition += ")"; }else if(operations.equals("update")){ // 组装 update sql 的结尾 condition += " where "; String and = ""; Iterator<? extends Map.Entry<?, ?>> iterator1 = mapData.entrySet().iterator(); while (iterator1.hasNext()) { Map.Entry<?, ?> next = iterator1.next(); if( next.getValue() instanceof String ){ value = "'" + next.getValue() +"'"; }else { value = "" + next.getValue() +""; } String key = next.getKey().toString(); if( key.lastIndexOf("Key_") != -1 ){ key = key.substring(key.indexOf("Key_")+ 4,key.length()); condition += and +"a." +key + "=" + value; and = " and "; } } } sql = operations + condition; }else { // 不使用组装sql的功能 sql = mySql; } return sql; } }
标签:operations,Java,String,组装,equals,next,sql,SQL,condition 来源: https://www.cnblogs.com/oukele/p/11517890.html
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