Question

我已经构建了一个jsp页面，我从用户那里获取了输入并从该输入创建了一个表，现在我必须在另一个页面上显示该表，并且我还必须通过Java同时在mysql中创建该表。 / p>

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Dynamic table</title>
<script src ="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<SCRIPT language="javascript">

	var counter=2;
	function addRow(tableID){
		var dynamicVal = 'row'+counter;
		$('#dataTable').append('\
		<TR>\
			<TD><INPUT type="checkbox" name="'+dynamicVal+'_chk" id="'+dynamicVal+'_chk"/></TD>\
			<TD><INPUT type="text" name="'+dynamicVal+'_col" id="'+dynamicVal+'_col" required/></TD>\
			<TD>\
				<SELECT name="'+dynamicVal+'_datatype" id="'+dynamicVal+'_datatype">\
					<OPTION value="int">INT(40)</OPTION>\
					<OPTION value="var">VARCHAR(40)</OPTION>\
					<OPTION value="char">CHAR(40)</OPTION>\
				</SELECT>\
			</TD>\
		</TR>');
		counter++;	
	}
	
	function deleteRow(tableID){
	/*$('#dataTable').find('[INPUT type="checkbox"]').each(function(){\
	if($this).prop("checked") == true({
	($this).closest('tr').remove();
	}
	});*/
			
			$('#dataTable').find('tr').each(function(){
			if($(this).find('input[type="checkbox"]').prop('checked') == true){
					$(this).remove();
				}
				
			}); 
	
	
	}
	
	function createJSON() {
	 
	var obj ={};
	obj.table_name=$("input[id=table_name]").val();
	var rowcolms = {};
	var rowcollection = [];
	$('#dataTable').find('tr').each(function(){
		var row = {};
		row.colName=$(this).find('input[type="text"]').val();
		row.dataType = $(this).find('select').val();
		rowcollection.push(row);
	});
	obj.tablecolms=rowcollection;
     /*var col_name = $(this).val("text");
		var datatype = $(this).type("select");

        item = {}
        item ["text"] = "col_name" ;
        item ["select"] = "datatype";

        jsonObj.push(item);
    });
	$*/
   console.log(obj);
   
}

function ajaxcall(){
	$.get.json({
	  url: Createdatabase,
	  type:"post",
	  data: jsonObj,
	  success: function(data){
	  console.log(data);
	  }
	});
}
	

	</SCRIPT>
</head>
<style>
  body {
    background-color : #D3D3D3;
    margin: 0;
    padding: 0;
}
h4 {
    color : #000000;
    text-align : center;
    font-family: "SIMPSON";
}
form {
    width: 300px;
    margin: 0 auto;
}
</style>
<body>
<form>
<h4>Create Your Table</h4>
<form action="servlet/createdatabase" method="post"> 
Table Name: <input type="text" name="table_name" id="table_name"required>
<input type="submit" value="Submit"><br><br>
<h4>Design Your Table</h4>
<INPUT type="button" value="Add Row" onclick="addRow('dataTable')" />

	<INPUT type="button" value="Delete Row" onclick="deleteRow('dataTable')" />

	<TABLE id="dataTable" name="dataTable" width="350px" border="1">
		<TR>
			<TD><INPUT type="checkbox" name="row1_chk" id="row1_chk"/></TD>
			<TD><INPUT type="text" name="row1_col" id="row1_col" required/></TD>
			<TD>
				<SELECT name="row1_datatype" id="row1_datatype" type="select">
					<OPTION value="int">INT(40)</OPTION>
					<OPTION value="var">VARCHAR(40)</OPTION>
					<OPTION value="char">CHAR(40)</OPTION>.
				</SELECT> 
			</TD>
		</TR>
	</TABLE><br>
<input type="button" value="Create Table" onclick="ajaxcall'">

</form>
</body>
</html>

所以请任何人都可以告诉我如何在另一个页面上创建这个表，还能以表格的形式创建这个表并在mysql中创建这个表？

Answer 1

JSP和MySQL之间的连接：下面的代码解释了首先创建连接。

import java.sql.*;  
class MysqlCon{  
public static void main(String args[]){  
try{  
Class.forName("com.mysql.jdbc.Driver");  
Connection con=DriverManager.getConnection(  
"jdbc:mysql://localhost:3306/sonoo","root","root");  
//here sonoo is database name, root is username and password  
Statement stmt=con.createStatement();  
ResultSet rs=stmt.executeQuery("select * from emp");  
while(rs.next())  
System.out.println(rs.getInt(1)+"  "+rs.getString(2)+"  "+rs.getString(3));  
con.close();  
}catch(Exception e){ System.out.println(e);}  
}  
}

要在第二页上显示数据，需要再次连接到DB，然后检索数据，有关详细信息，请查看此链接 mysql and jsp

Answer 2

这是用于从JSP创建表，也是用mysql建立连接

<%@ page import="java.sql.*" %>

<HTML>
    <HEAD>
        <TITLE>Creating a Table</TITLE>
    </HEAD>

    <BODY>
        <H1>Creating a Table</H1>

        <%  
            Connection connection = null;
            try {
                Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
                connection = DriverManager.getConnection("jdbc:odbc:data", "userName", "password");

                Statement statement = connection.createStatement();
                String command = "CREATE TABLE Employees (ID INTEGER, Name CHAR(50));";
                statement.executeUpdate(command);

            } catch (Exception e) {
                out.println("An error occurred.");
            }
        %>
        The Employees table was created.
    </BODY>
</HTML>

如何在JSP中插入数据后创建表，并通过java

2 个答案: