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DatabaseDumper201.java
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DatabaseDumper201.java
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import java.io.FileWriter;
import java.io.IOException;
import java.sql.*;
import java.util.*;
/**
* Class which needs to be implemented. ONLY this class should be modified
*/
public class DatabaseDumper201 extends DatabaseDumper {
/**
* @param c connection which the dumper should use
* @param type a string naming the type of database being connected to e.g. sqlite
*/
public DatabaseDumper201(Connection c, String type) {
super(c, type);
}
/**
* @param c connection to a database which will have a sql dump create for
*/
public DatabaseDumper201(Connection c) {
super(c, c.getClass().getCanonicalName());
}
public List<String> getTableNames()
{
List<String> result = new ArrayList<>();
try {
DatabaseMetaData md = getConnection().getMetaData();
ResultSet rs = md.getTables(null, null, "%", null);
while (rs.next()) {
if (rs.getString(4).equalsIgnoreCase("TABLE") && !rs.getString(3).contains("sqlite_")) { //Filters out any index & sqlite tables
result.add(rs.getString(3)); //Add table to list
}
}
} catch (SQLException throwables) {
throwables.printStackTrace();
}
return result;
}
/**
* Takes in all tables in database and sorts them by foreign key so no not-yet created table is referenced
* @return List of sorted tables
*/
public List<String> sortedTables()
{
List<String> sortedTables = new ArrayList<>();
List<String>tables = getTableNames();
try
{
DatabaseMetaData md = getConnection().getMetaData();
for(String table : tables)
{
ResultSet foreignKeys = md.getImportedKeys(null, null, table);
while(foreignKeys.next())
{
int index = sortedTables.indexOf(table);
String referTableName = foreignKeys.getString("PKTABLE_NAME"); //Gets table that is referred to
if(index == -1) //If list does not contain element
{
if(!sortedTables.contains(referTableName)) //Sorting algorithm
{
sortedTables.add(referTableName);
}
if(!sortedTables.contains(table))
{
sortedTables.add(table);
}
}
else
{
if(!sortedTables.contains(referTableName))
{
sortedTables.add(index, referTableName);
}
else if(sortedTables.indexOf(referTableName) > index)
{
sortedTables.remove(referTableName);
sortedTables.add(index, referTableName);
}
}
}
if(!sortedTables.contains(table)) //If does list does not contain table, add it
{
sortedTables.add(table);
}
}
}
catch (SQLException throwables)
{
throwables.printStackTrace();
}
return sortedTables;
}
@Override
public List<String> getViewNames()
{
List<String> result = new ArrayList<>();
try {
DatabaseMetaData md = getConnection().getMetaData();
ResultSet rs = md.getTables(null, null, null, new String[]{"VIEW"}); //Gets views as tables
while (rs.next()) {
String tableName = rs.getString("TABLE_NAME");
result.add(tableName);
}
} catch (SQLException throwables) {
throwables.printStackTrace();
}
return result;
}
public String getDriverInfo()
{
String info = "";
try
{
DatabaseMetaData md = getConnection().getMetaData();
int majorDBVersion = md.getDatabaseMajorVersion();
int minorDBVersion = md.getDatabaseMinorVersion();
int majorJDBCVersion = md.getJDBCMajorVersion();
int minorJDBCVersion = md.getJDBCMinorVersion();
info = "-- Major database version: " + majorDBVersion + "\n-- Minor database version: " + minorDBVersion + "\n-- Major JDBC version: "
+ majorJDBCVersion + "\n-- Minor JDBC Version: " + minorJDBCVersion + "\n---\n";
}
catch (SQLException throwables)
{
throwables.printStackTrace();
}
return info;
}
@Override
public String getDDLForTable(String tableName)
{
StringBuilder sqlCreateStatement = new StringBuilder("DROP TABLE IF EXISTS \""+ tableName + "\";\n" + "CREATE TABLE " + '"' + tableName + '"' + " (\n"); //Create table statement
return getDDL(tableName, sqlCreateStatement);
}
@Override
public String getInsertsForTable(String tableName)
{
StringBuilder insert = new StringBuilder();
try {
Statement statement = getConnection().createStatement();
ResultSet rs = statement.executeQuery("SELECT * FROM " + tableName);
getInserts(tableName, insert, rs);
} catch (SQLException throwables) {
throwables.printStackTrace();
}
return insert.toString();
}
@Override
public String getDDLForView(String viewName)
{
String newViewName = "view_" + viewName;
StringBuilder sqlCreateStatement = new StringBuilder("DROP TABLE IF EXISTS \""+ newViewName + "\"; \nCREATE TABLE \"" + newViewName + "\" (\n"); //Create table statement for the view
return getDDL(viewName, sqlCreateStatement);
}
/**
* private method with common code in both getDDLForTable and getDDLForView
* @param tableName table being used for DDL
* @param sqlCreateStatement create table statement
* @return Create table/view statement
*/
private String getDDL(String tableName, StringBuilder sqlCreateStatement) {
boolean firstLine = true; //True if on the first line
try {
DatabaseMetaData md = getConnection().getMetaData();
ResultSet rs = md.getColumns(null, null, tableName, "%");
while (rs.next()) {
if (!firstLine) {
sqlCreateStatement.append(", \n");
}
firstLine = false;
String columnName = '"' + rs.getString("COLUMN_NAME") + '"'; //Gets column
String typeName = rs.getString("TYPE_NAME"); //gets data type
String isNullable = rs.getString("IS_NULLABLE"); //For not null values
String nullable;
if (isNullable.equalsIgnoreCase("n")) { //If no nulls allowed in column
nullable = " NOT NULL";
} else {
nullable = "";
}
sqlCreateStatement.append(" ").append(columnName).append(" ").append(typeName).append(nullable);
}
rs.close();
ResultSet primaryKeys = md.getPrimaryKeys(null, null, tableName);
firstLine = true;
boolean empty = true; //Used for when 2 fields in primary key
while (primaryKeys.next()) {
empty = false;
if (firstLine) {
sqlCreateStatement.append(",\n PRIMARY KEY (");
} else {
sqlCreateStatement.append(", ");
}
firstLine = false;
sqlCreateStatement.append('"').append(primaryKeys.getString("COLUMN_NAME")).append('"'); //Adds primary key attribute
}
if (!empty) {
sqlCreateStatement.append(")");
}
primaryKeys.close();
ResultSet foreignKeys = md.getImportedKeys(null, null, tableName); //Gets foreign keys
while (foreignKeys.next()) {
sqlCreateStatement.append(",\n");
String foreignTable = foreignKeys.getString("PKTABLE_NAME"); //Gets table foreign key references
String foreignColumn = foreignKeys.getString("PKCOLUMN_NAME"); //Gets column foreign key references
String foreignKey = foreignKeys.getString("FKCOLUMN_NAME"); //Gets foreign key in this table
sqlCreateStatement.append(" FOREIGN KEY ").append("(\"").append(foreignKey).append("\")").append(" REFERENCES \"").append(foreignTable).append("\"(\"").append(foreignColumn).append('"').append(')');
}
foreignKeys.close();
} catch (SQLException throwables) {
throwables.printStackTrace();
}
sqlCreateStatement.append("\n);\n");
return sqlCreateStatement.toString();
}
/**
* Gets inserts for the view table
* @param viewName view to get inserts for
* @return string of inserts for view
*/
public String getInsertsForView(String viewName)
{
StringBuilder insert = new StringBuilder();
try {
Statement statement = getConnection().createStatement();
ResultSet rs = statement.executeQuery("SELECT * FROM " + viewName); //SQL query to get inserts
viewName = "\"view_" + viewName + "\""; //Required view_ format
getInserts(viewName, insert, rs);
} catch (SQLException throwables) {
throwables.printStackTrace();
}
return insert.toString();
}
/**
* private method with common code for getting inserts for tables and views
* @param tableName table for which to get inserts
* @param insert statement to
* @param rs Result set used for iterating through inserts
* @throws SQLException sqlException
*/
private void getInserts(String tableName, StringBuilder insert, ResultSet rs) throws SQLException {
ResultSetMetaData md = rs.getMetaData();
String replacement;
int columns = md.getColumnCount();
while (rs.next()) {
insert.append("INSERT INTO ").append(tableName).append(" VALUES(");
for (int i = 1; i < columns + 1; i++) { //Iterates through all columns
if (i > 1) {
insert.append(", ");
}
if (md.getColumnTypeName(i).equalsIgnoreCase("integer")) {
insert.append(rs.getString(i)); //append the int
} else if(rs.getString(i) != null) { //Does not append if null
replacement = rs.getString(i).replace("'", "''"); //In case of '' in names
insert.append("'").append(replacement).append("'");
}
}
insert.append(");\n");
}
rs.close();
}
@Override
public String getDumpString()
{
String info = getDriverInfo();
List<String> views = getViewNames();
List<String> orderedTables = sortedTables();
StringBuilder tables = new StringBuilder();
StringBuilder inserts = new StringBuilder();
StringBuilder indexes = new StringBuilder();
StringBuilder viewTables = new StringBuilder();
StringBuilder viewInserts = new StringBuilder();
String comment = "\n-- Views: \n\n";
for (String tableName : orderedTables) //Iterates through all tables
{
tables.append(getDDLForTable(tableName));
tables.append("---\n");
inserts.append(getInsertsForTable(tableName));
indexes.append(getDatabaseIndexes());
}
for (String view : views) //Iterates through all views
{
viewTables.append(getDDLForView(view));
viewTables.append("---\n");
viewInserts.append(getInsertsForView(view));
}
String appendInserts = inserts.toString();
String appendIndexes = indexes.toString();
String appendViewInserts = viewInserts.toString();
appendInserts = appendInserts.replace(";", ";\n---");
appendIndexes = appendIndexes.replace(";", ";\n---");
appendViewInserts = appendViewInserts.replace(";", "\n---");
return info + tables.toString() + appendInserts + appendIndexes + comment + viewTables.toString() + appendViewInserts;
}
@Override
public void dumpToFileName(String fileName)
{
try
{
FileWriter myWriter = new FileWriter(fileName);
myWriter.write(getDumpString());
myWriter.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
@Override
public void dumpToSystemOut()
{
dumpToFileName("DBDump.sql");
System.out.println(getDumpString());
}
/**
* private method for finding order of index - Sqlite bug only returns null
* @param order asc or descending or null
* @return order to append for sql
*/
private String order(String order)
{
if(order == null)
{
return ""; //Return empty string
}
else if(order.equals("A"))
{
return "ASC";
}
else
{
return "DSC";
}
}
@Override
public String getDatabaseIndexes()
{
StringBuilder indexStatements = new StringBuilder();
try
{
List<String> tables = getTableNames();
for (String table : tables)
{
boolean index = false;
boolean firstLine = true;
StringBuilder statement = new StringBuilder();
DatabaseMetaData md = getConnection().getMetaData();
ResultSet rs = md.getIndexInfo(null, null, table, true, false); //Result set for index info
while(rs.next())
{
String getOrder = rs.getString("ASC_OR_DESC"); //Usually would get order for the index
String order = order(getOrder);
index = true;
String columnName = rs.getString("COLUMN_NAME");
if(firstLine)
{
String indexName = rs.getString("INDEX_NAME");
if(indexName.contains("sqlite_autoindex")) //Filters out sqlite autoindexes
{
index = false;
break;
}
statement.append("DROP INDEX IF EXISTS \"").append(indexName).append("\";\nCREATE INDEX '").append(indexName).append("' ON ").append(table).append(" (").append(columnName).append(order);
firstLine = false;
}
else
{
statement.append(",").append(columnName).append(order);
}
}
if(index)
{
statement.append(");\n");
}
indexStatements.append(statement);
}
} catch (SQLException throwables)
{
throwables.printStackTrace();
}
return indexStatements.toString();
}
}