如何從頁面SQL語句進行相關后台查詢

前幾天剛剛做了一個頁面書寫sql語句，到后台查詢相關結果的案例，給大家分享一下。有不足之處請大家多指教！！！

一、頁面：因為查詢的表不固定，所以表格需要自助生成（這是利用了“jqGrid”）

若是不利用“jqGrid”也可以參考方法2.

方法1.

<div>
    <nobr>
        <div>
            <form method="get" action="/management/transactionFlow/informationQuery1">
                <div class="row">
                    <div class="col-md-10">
                            <textarea name="sql" STYLE="width: 1000px;height: 100px" id="sql"
                                      onfocus="ClearDefault(this)" placeholder="輸入查詢語句"
                                      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">確定
                        </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">

            //第一次加載的主表
            $(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);
            });
            //點擊重置按鈕
            $("#back").click(function () {
                $("#sql").empty();
            });
        </script>
    </content>

方法2.動態生成表格，但是分頁還需自己在寫一下

參考網址：https://q.cnblogs.com/q/73869/

 

代碼：

 

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.查詢表頭

    @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.查詢記錄數為分頁做准備

    @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;
//查詢總計錄數
        String records1 = customerLedgersService.query1(sql);
        int records = Integer.parseInt(records1);
        GridData result = new GridData();
//查詢分頁詳情
        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層（利用了JDBC原理）

需要考慮的是數據庫連接問題

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

	//查詢表頭
    @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 獲得連接
        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()) {
                //把一條記錄放入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關閉資源
//            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;
    }
//查詢總記錄數
    @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 獲得連接
        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()) {
                //把一條記錄放入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關閉資源
//            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;
    }
//查詢分頁詳情
    @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 獲得連接
        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()) {
                //把一條記錄放入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;
    }
}