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私は、選択したPostgresデータベースのテーブルと属性を取得し、ページがロードされるとすぐに配列に格納する必要があるSpring MVCプロジェクトに取り組んでいます。Postgresでデータベースのカラムとテーブルを取得する
私は現在、それぞれのデータベースの下にテーブルを表示して表示できる次のajax呼び出しを書いています。
VisualEditor.js
drop: function (e, ui) {
var mouseTop = e.clientY;
var mouseLeft = e.clientX;
var dropElem = ui.draggable.attr('class');
droppedElement = ui.helper.clone();
ui.helper.remove();
$(droppedElement).removeAttr("class");
$(droppedElement).draggable({containment: "container"});
jsPlumb.repaint(ui.helper);
//If the dropped Element is a TABLE then->
if (dropElem == "stream ui-draggable ui-draggable-handle") {
var newAgent = $('<div>');
jsPlumb.addEndpoint(newAgent,connectorProperties);
newAgent.attr('id', i).addClass('streamdrop');
var elemType = "table";
$("#container").addClass("disabledbutton");
$("#toolbox").addClass("disabledbutton");
$('#container').append(newAgent);
$.ajax({
type: "post",
url: "http://localhost:8080/controllers/tables",
cache: false,
success: function(response){
if (response !== "{}"){
var array = response.replace("{", "").replace("}", "");
var index = array.indexOf("[") +1;
var stringval = array.split(":");
var stringval2 = array.substring(index,array.indexOf("]")).split(",");
var db_names = new Array();
var table_names = new Array();
var column_names = new Array();
for(var i = 0 ;i < stringval.length-1 ;i++)
{
db_names[i] = eval(stringval[i]);
if(db_names[i]=="testdb"){
var StreamArray = new Array();
}
var listId = "db"+i;
var dropdownId ="mydrpdown"+i;
table_names[i] = new Array();
$("#lot").append(
"<li onclick='myFunction(\""+dropdownId+"\","+i+","+stringval2.length+")' class='list-group-item dropbtn' id='"+listId+"'> " + db_names[i] +
"</li> "+
"<div id='" + dropdownId +"' class='dropdown-content'> " +
"<a onclick='setDatabase(\""+db_names[i]+"\",\""+listId+"\")'> Make This as Default Database</a>"+
"</div>"
);
$("#databaseID").append(
"<option>" + db_names[i] +"</option>"
);
for(var j=0;j < stringval2.length;j++)
{
/**
* Loading the Predefined Databases and Tables of the Connected DB
*/
var table_id= "tableId"+i+j;
if(eval(stringval2[j]) != null){
table_names[i][j] = eval(stringval2[j]);
if(db_names[i]=="testdb")
{
StreamArray[j] = new Array(4);
StreamArray[j][0] = table_names[i][j];
/**
* table_names array values at the moment are:
* customer,department and students
* So the following ajax call should pass each table name to the listTables
* method in the controller and fetch the respective columns of each table
*/
$.ajax({
type: "post",
url: "http://localhost:8080/controllers/listTables/{tablename}",
data: { tablename: table_names[i][j]} ,
cache: false,
success: function(response){
if (response !== "{}"){
var array = response.replace("{", "").replace("}", "");
var index = array.indexOf("[") +1;
var stringval = array.split(":");
var stringval2 = array.substring(index,array.indexOf("]")).split(",");
var db_names = new Array();
var table_names = new Array();
var column_names = new Array();
for(var i = 0 ;i < stringval.length-1 ;i++){
}
}
}
});
}
$("#lot").append(
"<li class='list-group-item'style = 'display:none' id='"+table_id+"'> "+table_names[i][j]+" </li>");
}
}
$("#lot").append(
"</br>");
array = array.slice(array.indexOf("]") +2);
index = array.indexOf("[") +1;
stringval2 = array.substring(index,array.indexOf("]")).split(",");
}
}
},
error: function(xhr, status, error){
alert("Error while loading the query");
}
});
$("property").show();
$(".toolbox-titlex").show();
$(".panel").show();
私は、次の最初に行くでtable_namesとCOLUMN_NAMESを取得するために、中に埋め込まれた2つのAJAX呼び出しを書かれています。しかし、これは非常に効率的な方法ではないと推測しています。しかし、私は同時に両方を得る方法がわかりません。
EditorController.java
@RequestMapping(value= "/tables", method = RequestMethod.POST)
public @ResponseBody
String tables(HttpServletRequest request, HttpServletResponse response)
throws Exception {
Map<String, List<String>> alvalues = new HashMap<String, List<String>>();;
String queryString = request.getParameter("query");
// ApplicationContext context = new ClassPathXmlApplicationContext("Spring-Module.xml");
//CustomerDao customerDAO = (CustomerDao) context.getBean("CustomerDao");
alvalues = customerDAO.getAllTables();
Gson gson = new Gson();
String element = gson.toJson(alvalues);
System.out.println(element);
return element;
}
@RequestMapping(value= "/listTables/{tablename}", method = RequestMethod.POST)
public @ResponseBody
String listTables(HttpServletRequest request, HttpServletResponse response,@PathVariable("tablename") String tablename)
throws Exception {
Map<String, List<String>> alvalues = new HashMap<String, List<String>>();;
String queryString = request.getParameter("query");
alvalues = customerDAO.getAllFields(tablename);
Gson gson = new Gson();
String element = gson.toJson(alvalues);
System.out.println(element);
return element;
}
CustomerDAO.java
public Map<String, List<String>> getAllTables();
public Map<String, List<String>> getAllFields(String tablename);
jdbcCustomerDAO.java
public Map<String, List<String>> getAllTables(){
int k = 1;
Map<String, List<String>> map = new HashMap<String, List<String>>();
ArrayList<String> databases = getAllDatabse();
String sql = "SELECT table_name FROM information_schema.tables WHERE table_schema='public'";
Connection conn = null;
for(int i=0;i<=databases.size();i++)
{
try {
Class.forName("org.postgresql.Driver");
conn = DriverManager.getConnection(
"jdbc:postgresql://localhost:5432/"+databases.get(i),"postgres", "123");
PreparedStatement ps = conn.prepareStatement(sql,ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_UPDATABLE);
ResultSet rs = ps.executeQuery();
ArrayList<String> alvalues = new ArrayList<String>();
while(rs.next()){
alvalues.add(rs.getString(1));
}
map.put(databases.get(i), alvalues);
rs.beforeFirst();
for (Map.Entry<String, List<String>> entry : map.entrySet()) {
String key = entry.getKey();
List<String> values = entry.getValue();
System.out.println("Key = " + key);
System.out.println("Values = " + values + "n");
}
conn.close();
}
catch(Exception e){
System.out.println(e.getMessage());
}
}
return map;
}
public Map<String, List<String>> getAllFields(String tablename){
int k = 1;
Map<String, List<String>> map = new HashMap<String, List<String>>();
ArrayList<String> databases = getAllDatabse();
String sql = "SELECT column_name FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = '"+tablename+"'";
Connection conn = null;
for(int i=0;i<=databases.size();i++)
{
try {
Class.forName("org.postgresql.Driver");
conn = DriverManager.getConnection(
"jdbc:postgresql://localhost:5432/"+databases.get(i),"postgres", "123");
PreparedStatement ps = conn.prepareStatement(sql,ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_UPDATABLE);
ResultSet rs = ps.executeQuery();
ArrayList<String> alvalues = new ArrayList<String>();
while(rs.next()){
alvalues.add(rs.getString(1));
}
map.put(databases.get(i), alvalues);
rs.beforeFirst();
for (Map.Entry<String, List<String>> entry : map.entrySet()) {
String key = entry.getKey();
List<String> values = entry.getValue();
System.out.println("Key = " + key);
System.out.println("Values = " + values + "n");
}
conn.close();
}
catch(Exception e){
System.out.println(e.getMessage());
}
}
return map;
}
しかし、列名を正常に取得できません。
コンソールログ
これによると、table_namesが正常に取得さが、列名は空ですされています。
INFO : com.postgres.controllers.HomeController - Welcome home! The client locale is en_US.
postgres
postgreside
testdb
Key = postgres
Values = []n
Key = postgreside
Values = [constraints, users, notes, session, projects, databases, tables, columns, index, checksconstraint, additionalproperties, foreignref, primaryref, referenceproperties, department, person]n
Key = postgres
Values = []n
Key = testdb
Values = [customer, department, students]n
Key = postgreside
Values = [constraints, users, notes, session, projects, databases, tables, columns, index, checksconstraint, additionalproperties, foreignref, primaryref, referenceproperties, department, person]n
Key = postgres
Values = []n
Index: 3, Size: 3
{"testdb":["customer","department","students"],"postgreside":["constraints","users","notes","session","projects","databases","tables","columns","index","checksconstraint","additionalproperties","foreignref","primaryref","referenceproperties","department","person"],"postgres":[]}
postgres
postgreside
testdb
postgres
postgreside
testdb
postgres
postgreside
testdb
Key = postgres
Values = []n
Key = postgres
Values = []n
Key = postgres
Values = []n
Key = postgreside
Values = []n
Key = postgres
Values = []n
Key = postgreside
Values = []n
Key = postgres
Values = []n
Key = postgreside
Values = []n
Key = postgres
Values = []n
Key = testdb
Values = []n
Key = postgreside
Values = []n
Key = postgres
Values = []n
Index: 3, Size: 3
{"testdb":[],"postgreside":[],"postgres":[]}
Key = testdb
Values = []n
Key = postgreside
Values = []n
Key = postgres
Values = []n
Index: 3, Size: 3
{"testdb":[],"postgreside":[],"postgres":[]}
Key = testdb
Values = []n
Key = postgreside
Values = []n
Key = postgres
Values = []n
Index: 3, Size: 3
{"testdb":[],"postgreside":[],"postgres":[]}
私はを参照する必要がDB毎回にアクセスする必要がないように、私は、テーブル名とその属性/列を取得し、StreamArrayでそれを保存するために、単一のメソッドを持っていると思います関連するデータ
VisualEditor.jsの下に作成したStreamArrayに列名を取得して保存する方法についてのご意見をいただければ幸いです。
"columns"テーブルに対するクエリでは、スキーマの条件が不足しています。異なるスキーマで同じテーブル名を使用できます。 –