如何从页面SQL语句进行相关后台查询

="row"> <div class="col-md-10"> <textarea name="sql" STYLE="width: 1000px;height: 100px" id="sql" onfocus="ClearDefault(this)" placeholder="输入查询语句" onblur="AddDefault(this)">${sql}</textarea> </div> </div> <div class="row"> <div class="col-md-2"> <button type=‘submit‘ class="btn btn-primary btn-block" id="sure">确定 </button> </div> <div class="col-md-2"> <button id="back" type="reset" class="btn btn-primary btn-block">重置 </button> </div> <div> <table id="jqGrid"></table> <div id="jqGridPager"></div> </div> <script type="text/javascript"> //第一次加载的主表 $(document).ready(function () { $("#jqGrid").jqGrid({ url:"/management/transactionFlow/informationQuery?sql=${sql}", mtype: "GET", datatype: "json", styleUI: ‘Bootstrap‘, colModel: [ <c:forEach items="${list3}" var="user" varStatus="status"> {label: ‘${user}‘, name: ‘${user}‘, autowidth: true, sortable: false}, <%--<c:if test = "${status.last}">--%> <%--{label: ‘${user}‘, name:‘${user}‘, autowidth: true, sortable: false}--%> <%--</c:if>--%> </c:forEach> ], viewrecords: true, height: 400, shrinkToFit: false, rowNum: 10, autowidth: true, pager: "#jqGridPager", page: 1 }).trigger("reloadGrid"); return false; var len = $("#jqGrid").getGridParam("width"); // $("#jqGrid").setGridParam().hideCol("id"); $("#jqGrid").setGridWidth(len); }); //点击重置按钮 $("#back").click(function () { $("#sql").empty(); }); </script> </content>

方法2.动态生成表格，但是分页还需自己在写一下

参考网址：https://q.cnblogs.com/q/73869/

 

代码：

 

var table = "<table id=\"date\" name=\"TableName\" class=‘table table-striped table-bordered table-hover‘ >";
table += "<thead><tr><th>" + "" + "</th>";
for (var i = 0; i < date.length; i++) {
table += "<th >" + date[i] + "</th>";
}
table += "</tr></thead><tbody>";
for (var j = 0; j < department.length; j++) {
table += "<tr>";
table += "<td>" + department[j] + "</td>";
for (var n = 0; n < date.length; n++) {
table += "<td>" + SeriesStr[0].data[n] + "</td>";
}
}
table += "</tr>";
table += "</tbody></table>";
$("#Exceltable").html(table);

 二、controller

1.查询表头

    @RequestMapping(value = "transactionFlow/informationQuery1", method = RequestMethod.GET)
    public String informationQuery1(@RequestParam(value = "sql", required = false) String sql, Model model) {

        List<String> list3 = new LinkedList<>();
        String query1 = customerLedgersService.query(sql);
        Map map = new HashMap();
        if (query1 != null) {

            String[] key = query1.split(";");
            for (int i = 0, len = key.length; i < len; i++) {
                list3.add(key[i]);
            }

            model.addAttribute("sql", sql);
            model.addAttribute("list3", list3);
            return "/complement/informationQuery";
        } else {
            model.addAttribute("sql", sql);

            return "/complement/informationQuery";
        }

    }

 2.查询记录数为分页做准备

    @RequestMapping(value = "transactionFlow/informationQuery", method = RequestMethod.GET)
    @ResponseBody
    public GridData informationQuery(@RequestParam(value = "sql", required = false) String sql,
                                     @RequestParam(value = "page", required = false) Integer page,
                                     @RequestParam(value = "rows", required = false) Integer rows
    ) {
        List list7 = new LinkedList<>();
        String queryValue = null;
//查询总计录数
        String records1 = customerLedgersService.query1(sql);
        int records = Integer.parseInt(records1);
        GridData result = new GridData();
//查询分页详情
        String listTotal = customerLedgersService.query2(sql, page, rows);
        String query2 = null;
        List<String> list6 = new ArrayList<>();
        List<String> list5 = new ArrayList();
        if (listTotal != null) {
            String[] keyq3 = listTotal.split("%");
            for (int i = 0, len = keyq3.length; i < len; i++) {
                list6.add(keyq3[i]);
            }
            for (int m = 0; m < list6.size(); m++) {
                queryValue = list6.get(m);
                String[] value = queryValue.split(";");
                List<String> list = Arrays.asList(value);
                ListIterator<String> li = list.listIterator();
                while (li.hasNext()) {
                    Object obj = li.next();
                    if (obj.equals("0E-8")) {
                        li.set("0.00000000");
                    }
                    if (obj.equals("null")) {
                        li.set("");
                    }
                }
                list7.add(list);

            }
        }
        long totaPage = records % rows == 0 ? records / rows : records / rows + 1;
        result.setPage(page);
        result.setRecords(records);
        result.setTotal((int) totaPage);
        if (list7 != null) {
            result.getRows().addAll(list7);
        }
        return result;
    }

 

三、dao层（利用了JDBC原理）

需要考虑的是数据库连接问题

/**
 * Created by ${yucong} on 2017/7/6.
 */
@Repository
public class QueryDaoImpl implements QueryDao {
    private static Logger logger = LoggerFactory.getLogger(QueryDaoImpl.class);

	//查询表头
    @Override
    public String selectSql(String sql) {
        DataSource ds = null;
        Connection conn = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        StringBuffer sb = new StringBuffer();
        int index = 1;
        //1 获得连接
        try {

            if(sql == null){
                return null;
            }

            InitialContext initialContext = new InitialContext();
            ds = (DataSource) initialContext.lookup("jdbc/account-structure");
            if (ds != null) {
                conn = ds.getConnection();
            }
            if(!sql.contains(";")){
                sql=sql+";";
            }
            if(!sql.contains("limit") && !sql.contains("LIMIT")){
                if(sql.contains(";")){
                    sql = sql.replaceAll(";", "");
                }
                sql = sql + " limit 0, 1;";
            }
            pstmt = conn.prepareStatement(sql);
            rs = pstmt.executeQuery();
            List<LinkedHashMap<String, Object>> values = new ArrayList<>();
            ResultSetMetaData rsmd = rs.getMetaData();
            LinkedHashMap<String, Object> map = null;
            while (rs.next()) {
                //把一条记录放入Map中
                map = new LinkedHashMap<String, Object>();
                for (int i = 0; i < rsmd.getColumnCount(); i++) {
                    String columnLabel = rsmd.getColumnLabel(i + 1);
                    Object value = rs.getObject(i + 1);
                    map.put(columnLabel, value);
                }
                values.add(map);
            }

            if (values.size() > 0) {
                for (Map<String, Object> m : values) {
                    Set<String> set = m.keySet();
                    for (String s : set) {
                        sb.append(s + ";");
                    }
                }

            }
            return sb.toString();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //6关闭资源
//            JDBCUtils.close(conn, pstmt, rs);
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
                try {
                    pstmt.close();
                } catch (SQLException e1) {
                    e1.printStackTrace();
                }
                try {
                    rs.close();
                } catch (SQLException e1) {
                    e1.printStackTrace();
                }
            }
        }
        return null;
    }
//查询总记录数
    @Override
    public String selectSql1(String sql) {
        DataSource ds = null;
        Connection conn = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        StringBuffer sb = new StringBuffer();
        int index = 0;
        //1 获得连接
        try {

            if(sql == null){
                return null;
            }

            InitialContext initialContext = new InitialContext();
            ds = (DataSource) initialContext.lookup("jdbc/account-structure");
            if (ds != null) {
                conn = ds.getConnection();
            }
            if(!sql.contains(";")){
                sql=sql+";";
            }
            if(!sql.contains("limit") && !sql.contains("LIMIT")){
                if(sql.contains(";")){
                    sql = sql.replaceAll(";", "");
                }
                sql = sql + "  limit 0, 5000;";
            }
            pstmt = conn.prepareStatement(sql);
            rs = pstmt.executeQuery();
            List<LinkedHashMap<String, Object>> values = new ArrayList<>();
            ResultSetMetaData rsmd = rs.getMetaData();
            LinkedHashMap<String, Object> map = null;
            while (rs.next()) {
                //把一条记录放入Map中
                map = new LinkedHashMap<String, Object>();
                for (int i = 0; i < rsmd.getColumnCount(); i++) {
                    String columnLabel = rsmd.getColumnLabel(i + 1);
                    Object value = rs.getObject(i + 1);
                    map.put(columnLabel, value);
                }
                values.add(map);
            }

            if (values.size() > 0) {
                for (Map<String, Object> m : values) {
                    Set<String> set = m.keySet();
                    for (String s : set) {
                        sb.append(s + ";");
                    }
                    sb.append("|"+index++);
                }

            }

            return String.valueOf(index);

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //6关闭资源
//            JDBCUtils.close(conn, pstmt, rs);
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
                try {
                    pstmt.close();
                } catch (SQLException e1) {
                    e1.printStackTrace();
                }
                try {
                    rs.close();
                } catch (SQLException e1) {
                    e1.printStackTrace();
                }
            }
        }
        return null;
    }
//查询分页详情
    @Override
    public String selectSq2(String sql, Integer page, Integer rows) {
        DataSource ds = null;
        Connection conn = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        StringBuffer sb = new StringBuffer();
        StringBuffer sb1 = new StringBuffer();
        int index = 1;
        //1 获得连接
        try {

            InitialContext initialContext = new InitialContext();
            ds = (DataSource) initialContext.lookup("jdbc/account-structure");
            if (ds != null) {
                conn = ds.getConnection();
            }
            String sql1=null;
            StringBuffer sql2=null;
            if(!sql.contains(";")){
                sql=sql+";";
            }
            sql1=sql.substring(0,sql.length()-1);

            sql2=sb1.append(sql1+" "+"limit"+" "+"?"+","+"?;");
            pstmt = conn.prepareStatement(sql2.toString());
            int startIndex = (page - 1) * rows;
            pstmt.setInt(1,startIndex);
            pstmt.setInt(2,rows);
            rs = pstmt.executeQuery();
            List<LinkedHashMap<String, Object>> values = new ArrayList<>();
            ResultSetMetaData rsmd = rs.getMetaData();
            LinkedHashMap<String, Object> map = null;
            while (rs.next()) {
                //把一条记录放入Map中
                map = new LinkedHashMap<String, Object>();
                for (int i = 0; i < rsmd.getColumnCount(); i++) {
                    String columnLabel = rsmd.getColumnLabel(i + 1);
                    Object value = rs.getObject(i + 1);
                    map.put(columnLabel, value);
                }
                values.add(map);
            }

            if (values.size() > 0) {
                for (Map<String, Object> m : values) {
                    Set<String> set = m.keySet();

                    for (String s : set) {
                        sb.append(m.get(s) + ";");
                    }
                    sb.append("%");
                }
            }
            return sb.toString();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {

            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
                try {
                    pstmt.close();
                } catch (SQLException e1) {
                    e1.printStackTrace();
                }
                try {
                    rs.close();
                } catch (SQLException e1) {
                    e1.printStackTrace();
                }
            }
        }
        return null;
    }
}

 

如何从页面SQL语句进行相关后台查询

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