Delete EffSyncExecuteStatement.java
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package com.btk5h.skriptdb.skript;
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import com.btk5h.skriptdb.SkriptDB;
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import com.btk5h.skriptdb.SkriptUtil;
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import com.zaxxer.hikari.HikariDataSource;
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import org.bukkit.Bukkit;
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import org.bukkit.event.Event;
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import org.eclipse.jdt.annotation.Nullable;
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import java.sql.Connection;
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import java.sql.PreparedStatement;
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import java.sql.ResultSetMetaData;
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import java.sql.SQLException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Locale;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import javax.sql.rowset.CachedRowSet;
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import ch.njol.skript.Skript;
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import ch.njol.skript.effects.Delay;
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import ch.njol.skript.lang.Expression;
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import ch.njol.skript.lang.SkriptParser;
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import ch.njol.skript.lang.TriggerItem;
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import ch.njol.skript.lang.Variable;
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import ch.njol.skript.lang.VariableString;
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import ch.njol.skript.variables.Variables;
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import ch.njol.util.Kleenean;
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/**
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* Executes a statement on a database and optionally stores the result in a variable. Expressions
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* embedded in the query will be escaped to avoid SQL injection.
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* <p>
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* If a single variable, such as `{test}`, is passed, the variable will be set to the number of
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* affected rows.
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* <p>
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* If a list variable, such as `{test::*}`, is passed, the query result will be mapped to the list
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* variable in the form `{test::<column name>::<row number>}`
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*
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* Specifying `synchronously` will make skript-db execute the query on the event thread, which is useful for async
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* events. Note that skript-db will ignore this flag if you attempt to run this on the main thread.
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*
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* @name Execute Statement
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* @pattern [synchronously] execute %string% (in|on) %datasource% [and store [[the] (output|result)[s]] (to|in)
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* [the] [var[iable]] %-objects%]
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* @example execute "select * from table" in {sql} and store the result in {output::*}
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* @example execute "select * where player=%{player}%" in {sql} and store the result in {output::*}
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* @since 0.1.0
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*/
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public class EffSyncExecuteStatement extends Delay {
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static {
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Skript.registerEffect(EffSyncExecuteStatement.class, new String[] { "sync[hronous[ly]] execute %string% (in|on) %datasource% [and store [[the] (output|result)[s]] (to|in) [the] [var[iable]] %-objects%]" });
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}
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static String lastError;
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private static final ExecutorService threadPool =
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Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
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private Expression<String> query;
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private Expression<HikariDataSource> dataSource;
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private VariableString var;
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private boolean isLocal;
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private boolean isList;
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private boolean isSyncOk;
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private void continueScriptExecution(Event e, String res) {
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lastError = res;
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if (getNext() != null) {
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TriggerItem.walk(getNext(), e);
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}
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}
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@Override
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protected void execute(Event e) {
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boolean isMainThread = Bukkit.isPrimaryThread();
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if (isSyncOk) {
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String result = syncExecuteStatement(e);
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continueScriptExecution(e, result);
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} else {
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CompletableFuture<String> sql =
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CompletableFuture.supplyAsync(() -> syncExecuteStatement(e), threadPool);
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sql.whenComplete((res, err) -> {
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if (err != null) {
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err.printStackTrace();
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}
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Bukkit.getScheduler().runTask(SkriptDB.getInstance(), () -> continueScriptExecution(e, res));
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});
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}
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}
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@Override
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protected TriggerItem walk(Event e) {
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debug(e, true);
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if (!isSyncOk) {
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SkriptUtil.delay(e);
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}
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execute(e);
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return null;
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}
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private String syncExecuteStatement(Event e) {
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HikariDataSource ds = dataSource.getSingle(e);
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if (ds == null) {
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return "Data source is not set";
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}
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try (Connection conn = ds.getConnection();
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PreparedStatement stmt = createStatement(e, conn)) {
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boolean hasResultSet = stmt.execute();
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if (var != null) {
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String baseVariable = var.toString(e)
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.toLowerCase(Locale.ENGLISH);
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if (isList) {
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baseVariable = baseVariable.substring(0, baseVariable.length() - 1);
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}
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if (hasResultSet) {
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CachedRowSet crs = SkriptDB.getRowSetFactory().createCachedRowSet();
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crs.populate(stmt.getResultSet());
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if (isList) {
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populateVariable(e, crs, baseVariable);
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} else {
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crs.last();
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setVariable(e, baseVariable, crs.getRow());
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}
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} else if (!isList) {
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setVariable(e, baseVariable, stmt.getUpdateCount());
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}
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}
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} catch (SQLException ex) {
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return ex.getMessage();
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}
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return null;
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}
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private PreparedStatement createStatement(Event e, Connection conn) throws SQLException {
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if (!(query instanceof VariableString)) {
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return conn.prepareStatement(query.getSingle(e));
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}
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if (((VariableString) query).isSimple()) {
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return conn.prepareStatement(SkriptUtil.getSimpleString(((VariableString) query)));
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}
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StringBuilder sb = new StringBuilder();
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List<Object> parameters = new ArrayList<>();
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Object[] objects = SkriptUtil.getTemplateString(((VariableString) query));
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for (int i = 0; i < objects.length; i++) {
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Object o = objects[i];
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if (o instanceof String) {
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sb.append(o);
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} else {
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Expression<?> expr = SkriptUtil.getExpressionFromInfo(o);
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String before = getString(objects, i - 1);
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String after = getString(objects, i + 1);
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boolean standaloneString = false;
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if (before != null && after != null) {
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if (before.endsWith("'") && after.endsWith("'")) {
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standaloneString = true;
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}
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}
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Object expressionValue = expr.getSingle(e);
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if (expr instanceof ExprUnsafe) {
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sb.append(expressionValue);
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if (standaloneString && expressionValue instanceof String) {
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String rawExpression = ((ExprUnsafe) expr).getRawExpression();
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Skript.warning(
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String.format("Unsafe may have been used unnecessarily. Try replacing 'unsafe %1$s' with %1$s",
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rawExpression));
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}
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} else {
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parameters.add(expressionValue);
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sb.append('?');
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if (standaloneString) {
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Skript.warning("Do not surround expressions with quotes!");
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}
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}
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}
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}
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PreparedStatement stmt = conn.prepareStatement(sb.toString());
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for (int i = 0; i < parameters.size(); i++) {
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stmt.setObject(i + 1, parameters.get(i));
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}
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return stmt;
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}
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private String getString(Object[] objects, int index) {
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if (index < 0 || index >= objects.length) {
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return null;
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}
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Object object = objects[index];
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if (object instanceof String) {
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return (String) object;
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}
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return null;
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}
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private void setVariable(Event e, String name, Object obj) {
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Variables.setVariable(name.toLowerCase(Locale.ENGLISH), obj, e, isLocal);
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}
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private void populateVariable(Event e, CachedRowSet crs, String baseVariable)
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throws SQLException {
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ResultSetMetaData meta = crs.getMetaData();
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int columnCount = meta.getColumnCount();
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for (int i = 1; i <= columnCount; i++) {
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String label = meta.getColumnLabel(i);
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setVariable(e, baseVariable + label, label);
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}
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int rowNumber = 1;
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while (crs.next()) {
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for (int i = 1; i <= columnCount; i++) {
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setVariable(e, baseVariable + meta.getColumnLabel(i).toLowerCase(Locale.ENGLISH)
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+ Variable.SEPARATOR + rowNumber, crs.getObject(i));
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}
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rowNumber++;
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}
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}
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@Override
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public String toString(@Nullable Event e, boolean debug) {
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return "execute " + query.toString(e, debug) + " in " + dataSource.toString(e, debug);
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}
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@SuppressWarnings("unchecked")
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@Override
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public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed,
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SkriptParser.ParseResult parseResult) {
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Expression<String> statementExpr = (Expression<String>) exprs[0];
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if (statementExpr instanceof VariableString || statementExpr instanceof ExprUnsafe) {
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query = statementExpr;
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} else {
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Skript.error("Database statements must be string literals. If you must use an expression, " +
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"you may use \"%unsafe (your expression)%\", but keep in mind, you may be vulnerable " +
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"to SQL injection attacks!");
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return false;
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}
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dataSource = (Expression<HikariDataSource>) exprs[1];
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Expression<?> expr = exprs[2];
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isSyncOk = true;
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if (expr instanceof Variable) {
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Variable<?> varExpr = (Variable<?>) expr;
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var = SkriptUtil.getVariableName(varExpr);
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isLocal = varExpr.isLocal();
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isList = varExpr.isList();
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} else if (expr != null) {
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Skript.error(expr + " is not a variable");
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return false;
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}
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return true;
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}
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}
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