public static List<String> fetchDatabyColumn(String str) {
String[] token = str.split("[ \\s > ]");
boolean checkSyntex = false;
list = new ArrayList<String>();
listError = new ArrayList<String>();
// List<Integer> ColumnIndex = new ArrayList<Integer>();
for (int i = 0; i < token.length; i++) {
if (token[i].equalsIgnoreCase("from")) {
count = i;
checkSyntex = true;
break;
}
} // end of for loop
if (checkSyntex) {
if (token[count + 1].endsWith(";")) {
token[count + 1] = token[count + 1].replaceAll(";", "");
boolean fileExists = false;
if (TableCreation.useDatabase == null) file = new File(dir + "/Databases Folder/nehra");
else file = new File(dir + "/Databases Folder/" + TableCreation.useDatabase);
String[] files = file.list();
for (int i = 0; i < files.length; i++) {
if (files[i].equalsIgnoreCase(token[count + 1] + ".csv")) fileExists = true;
} // end of for loop
if (fileExists) {
if (TableCreation.useDatabase == null)
fileName = dir + "/Databases Folder/nehra/" + token[count + 1] + ".csv";
else
fileName =
dir
+ "/Databases Folder/"
+ TableCreation.useDatabase
+ "/"
+ token[count + 1]
+ ".csv";
try {
BufferedReader br = new BufferedReader(new FileReader(fileName));
int startCount = 2;
String row = null;
while ((row = br.readLine()) != null) {
list.add(row);
}
br.close();
if (token[count - 1].endsWith(",")) {
error = SelectTableError.errorCommaInLastClolumn(token[count - 1]);
listError.add(error);
return listError;
} else {
while (startCount < count - 1) {
if ((token[startCount].endsWith(",")) == false) {
error = SelectTableError.errorCommaInClolumn(token[startCount]);
listError.add(error);
return listError;
}
startCount++;
}
} // end of else
String[] temp;
startCount = 2;
String columns = "";
while (startCount < count) {
columns = columns.concat(token[startCount]);
startCount++;
} // end of while
temp = columns.split(",");
String column = list.get(0);
token = column.split("[ ,]");
for (int i = 0; i < temp.length; i++) {
boolean isColumn = false;
for (int j = 0; j < token.length; j++) {
if (j % 2 == 0) {
if (temp[i].equalsIgnoreCase(token[j])) {
// ColumnIndex.add(j/2);
// System.out.print(token[j]+"\t");
isColumn = true;
break;
}
} // end of if(j%2==0)
} // end of for(j)
if (isColumn == false) {
error = SelectTableError.errorInClolumnName(temp[i]);
listError.add(error);
return listError;
}
} // end of for(i)
/*System.out.print("\n");
for (int k = 1; k < list.size(); k++) {
temp = list.get(k).split(",");
for (int i = 0; i < ColumnIndex.size(); i++) {
System.out.print(temp[ColumnIndex.get(i)]+"\t");
}
System.out.print("\n");
}*/
return list;
} catch (IOException e) {
e.printStackTrace();
}
} // end of if(fileExists)
else {
error = SelectTableError.errorInTableName(token[count + 1]);
listError.add(error);
return listError;
}
} // end of if(;)
else {
error = SelectTableError.errorInSemicolon(token[count + 1]);
listError.add(error);
return listError;
}
} // end of if(checkSyntex)
else {
error = SelectTableError.errorInFromMissing();
listError.add(error);
return listError;
}
return null;
} // end of function fetchDatabyColumn()
public static List<String> selectAllData(String str) {
list = new ArrayList<String>();
String[] token = str.split("[ \\s > ]");
if (token[3].equalsIgnoreCase("from")) {
if (token[4].endsWith(";") || token[5].equals(";")) {
token[4] = token[4].replaceAll(";", "");
boolean fileExists = false;
if (TableCreation.useDatabase == null) file = new File(dir + "/Databases Folder/nehra");
else file = new File(dir + "/Databases Folder/" + TableCreation.useDatabase);
String[] files = file.list();
for (int i = 0; i < files.length; i++) {
if (files[i].equalsIgnoreCase(token[4] + ".csv")) fileExists = true;
} // end of for loop
if (fileExists) {
if (TableCreation.useDatabase == null)
fileName = dir + "/Databases Folder/nehra/" + token[4] + ".csv";
else
fileName =
dir + "/Databases Folder/" + TableCreation.useDatabase + "/" + token[4] + ".csv";
try {
BufferedReader br = new BufferedReader(new FileReader(fileName));
String lineString = null;
while ((lineString = br.readLine()) != null) {
list.add(lineString);
}
br.close();
return list;
} catch (IOException e) {
e.printStackTrace();
}
} // end of if(fileExists)
else {
error = SelectTableError.errorInTableName(token[4]);
list.add(error);
return list;
}
} // end of if(;)
else { //////////////////////////// where condition////////////////////////////////////
if (token[5].equalsIgnoreCase("where")) {
if (TableCreation.useDatabase == null) fileName = dir + "/Databases Folder/nehra/";
else fileName = dir + "/Databases Folder/" + TableCreation.useDatabase + "/";
file = new File(fileName);
String[] files = file.list();
boolean fileExists = false;
for (int i = 0; i < files.length; i++) {
if (files[i].equalsIgnoreCase(token[4] + ".csv")) fileExists = true;
} // end of for loop
if (fileExists) {
// int rowCount=0;
try {
List<String> list1 = new ArrayList<String>();
if (TableCreation.useDatabase == null)
fileName = dir + "/Databases Folder/nehra/" + token[4] + ".csv";
else
fileName =
dir
+ "/Databases Folder/"
+ TableCreation.useDatabase
+ "/"
+ token[4]
+ ".csv";
BufferedReader fileRead = new BufferedReader(new FileReader(fileName));
List<String> list = new ArrayList<String>();
String lineString = null;
while ((lineString = fileRead.readLine()) != null) list.add(lineString);
fileRead.close();
if (token[5].equalsIgnoreCase("where")) {
String[] temp2;
int count = 5;
String whereCondition = "";
while (count < token.length - 1) {
whereCondition = whereCondition.concat(token[count + 1]);
count++;
}
if (whereCondition.endsWith(";")) {
whereCondition = whereCondition.replaceAll(";", "");
temp2 = whereCondition.split("=");
for (int i = 0; i < temp2.length; i++) {
if (temp2.length < 2) {
error = UpdateTableError.errorInEqualSign(temp2[i]);
list1.add(error);
return list1;
}
if (temp2.length > 2) {
error = UpdateTableError.errorMissingWhereKeyword();
list1.add(error);
return list1;
}
}
} // end of if(;)
else {
error = UpdateTableError.errorInSemicolon();
list1.add(error);
return list1;
}
/////////////// where condition////////////////////
String column = list.get(0);
token = column.split("[ ,]");
String[] temp = whereCondition.split("=");
for (int i = 0; i < temp.length; i++) {
if (i % 2 == 0) {
boolean isColumn = false;
for (int j = 0; j < token.length; j++) {
if (j % 2 == 0) {
if (temp[i].equalsIgnoreCase(token[j])) {
count = j;
isColumn = true;
break;
}
} // end of if(j%2==0)
} // end of for(j)
if (isColumn == false) {
error = UpdateTableError.errorInClolumnName(temp[i]);
list1.add(error);
return list1;
}
} // end of if(i%2==0)
if (i % 2 != 0) {
if (token[count + 1].equals("String")) {
if (temp[i].startsWith("'") && temp[i].endsWith("'")) {
continue;
} else {
error = UpdateTableError.errorInStringValue(temp[i]);
list1.add(error);
return list1;
}
} else if (token[count + 1].equals("char")) {
if (temp[i].startsWith("'") && temp[i].endsWith("'")) {
continue;
} else {
error = UpdateTableError.errorInCharValue(temp[i]);
list1.add(error);
return list1;
}
} else if (token[count + 1].equals("int")) {
if (temp[i].matches("[0-9]+")) {
continue;
} else {
error = UpdateTableError.errorInIntValue(temp[i]);
list1.add(error);
return list1;
}
} else if (token[count + 1].equals("float")) {
if (temp[i].matches("[0-9]*[.]*[0-9]*")) {
continue;
} else {
error = UpdateTableError.errorInFloatValue(temp[i]);
list1.add(error);
return list1;
}
} else if (token[count + 1].equals("boolean")) {
if (temp[i].equalsIgnoreCase("true") || temp[i].equalsIgnoreCase("false")) {
continue;
} else {
error = UpdateTableError.errorInBooleanValue(temp[i]);
list1.add(error);
return list1;
}
} else if (token[count + 1].equals("Date")) {
if (temp[i].startsWith("'") && temp[i].endsWith("'")) {
temp[i] = temp[i].replaceAll("'", "");
if (temp[i].matches("[0-3][0-9][-][0-1][0-9][-][0-9][0-9]")) {
continue;
} else {
error = UpdateTableError.errorInDateValue(temp[i]);
list1.add(error);
return list1;
}
} else {
error = UpdateTableError.errorInDateValue(temp[i]);
list1.add(error);
return list1;
}
}
} // end of if(i%2!0)
} // end of for(i)
int col = count;
count = 0;
token = whereCondition.split("=");
if (token[1].startsWith("'") && token[1].endsWith("'"))
token[1] = token[1].replaceAll("'", "");
list1.add(list.get(0));
for (int j = 1; j < list.size(); j++) {
temp = list.get(j).split(",");
for (int j2 = 0; j2 < temp.length; j2++) {
if (temp[j2].equals(token[1])) {
count++;
list1.add(list.get(j));
} // end of if
} // end of for(j2)
} // end of for(j)
} // end of if where
return list1;
} // end of try
catch (IOException e) {
e.printStackTrace();
}
} // end of if(fileExists)
else {
error = UpdateTableError.errorTableNotExist(token[2]);
list.add(error);
return list;
}
} // end of if(where)
else {
error = UpdateTableError.errorMissingWhereKeyword();
list.add(error);
return list;
}
} // end of else
} // end of if from
else {
error = SelectTableError.errorInFrom(token[3]);
list.add(error);
return list;
}
return null;
} // end of function selectAllData