First basic untested implementation

Signed-off-by: Lixfel <agga-games@gmx.de>

src/de/steamwar/sql/Field.java

@@ -19,21 +19,58 @@
 
 package de.steamwar.sql;
 
-public class Field {
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Field<T> {
+
+    private static final Map<Class<?>, String> sqlTypeMapping = new HashMap<>();
+    private static final Map<Class<?>, SqlTypeParser<?>> sqlTypeParser = new HashMap<>();
+
+    public static <T> void addTypeMapping(Class<T> clazz, String sqlType, SqlTypeParser<T> parser) {
+        sqlTypeMapping.put(clazz, sqlType);
+        sqlTypeParser.put(clazz, parser);
+    }
+
+    static {
+        addTypeMapping(String.class, "TEXT", (rs, field) -> rs.getString(field.identifier()));
+        addTypeMapping(boolean.class, "INTEGER(1)", (rs, field) -> rs.getBoolean(field.identifier()));
+        addTypeMapping(byte.class, "INTEGER(1)", (rs, field) -> rs.getByte(field.identifier()));
+        addTypeMapping(short.class, "INTEGER(2)", (rs, field) -> rs.getShort(field.identifier()));
+        addTypeMapping(int.class, "INTEGER(4)", (rs, field) -> rs.getInt(field.identifier()));
+        addTypeMapping(long.class, "INTEGER(8)", (rs, field) -> rs.getLong(field.identifier()));
+        addTypeMapping(float.class, "REAL", (rs, field) -> rs.getFloat(field.identifier()));
+        addTypeMapping(double.class, "REAL", (rs, field) -> rs.getDouble(field.identifier()));
+    }
 
     private final String identifier;
-    private final Class<?> type;
+    private final Class<T> type;
 
-    public Field(String identifier, Class<?> type) {
+    private final SqlTypeParser<T> parser;
+    private final String sqlType;
+
+    public Field(String identifier, Class<T> type) {
         this.identifier = identifier;
         this.type = type;
+        this.parser = (SqlTypeParser<T>) sqlTypeParser.get(type);
+        this.sqlType = sqlTypeMapping.get(type);
     }
 
     public String identifier() {
         return identifier;
     }
 
-    public Class<?> type() {
+    public Class<T> type() {
         return type;
     }
+
+    public String sqlType() {
+        return sqlType;
+    }
+
+    public T parse(ResultSet rs) throws SQLException {
+        return parser.parse(rs, this);
+    }
 }

src/de/steamwar/sql/Row.java

@@ -24,12 +24,16 @@ public class Row {
     private final Table table;
     private Object[] values;
 
-    public Row(Table table, Object[] values) {
+    public Row(Table table, Object... values) {
         this.table = table;
         this.values = values;
     }
 
-    void update(Field field, Object value) {
+    private <T> T get(Field<T> field) {
+        return (T) values[table.getFieldId(field)];
+    }
 
+    void update(Field<?>[] fields, Object... values) {
+        table.update(values[table.keyId()], fields, values);
     }
 }

src/de/steamwar/sql/SqlTypeParser.java

@@ -0,0 +1,27 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2022  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.sql;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+public interface SqlTypeParser<T> {
+    T parse(ResultSet rs, Field<T> field) throws SQLException;
+}

src/de/steamwar/sql/Statement.java

@@ -47,7 +47,7 @@ public class Statement implements AutoCloseable {
                 throw new SecurityException("Could not load SQL connection", e);
             }
 
-            String url = "jdbc:mysql://" + properties.getProperty("host") + ":" + properties.getProperty("port") + "/" + properties.getProperty("database") + "?autoReconnect=true&useServerPrepStmts=true";
+            String url = "jdbc:mysql://" + properties.getProperty("host") + ":" + properties.getProperty("port") + "/" + properties.getProperty("database") + "?useServerPrepStmts=true";
             String user = properties.getProperty("user");
             String password = properties.getProperty("password");
 

src/de/steamwar/sql/Table.java

@@ -19,69 +19,96 @@
 
 package de.steamwar.sql;
 
+import java.sql.ResultSet;
+import java.sql.SQLException;
 import java.util.*;
-import java.util.logging.Level;
 import java.util.stream.Collectors;
 
 public class Table {
 
     private final String name;
-    private final Field key;
-    private final Field[] fields;
+    private final Field<?> key;
+    private final Field<?>[] fields;
+    private final Map<Field<?>, Integer> fieldIds = new HashMap<>();
+    private final int keyId;
 
-    private final Map<Field, Statement> selectBy = new HashMap<>();
+    private final Map<Field<?>, Statement> cachedSelect = new HashMap<>();
+    private final Map<Field<?>[], Statement> cachedInsert = new HashMap<>();
+    private final Map<Field<?>[], Statement> cachedUpdate = new HashMap<>();
 
-    public Table(String name, Field key, Field... fields) {
+    public Table(String name, Field<?> key, Field<?>... fields) {
         this.name = name;
         this.key = key;
         this.fields = fields;
-    }
-
-    public Row selectSingle(Field field, Object value) {
-        return select(rs -> {
-            if(!rs.next())
-                return null;
-
-            Object[] values = new Object[fields.length];
         for(int i = 0; i < fields.length; i++) {
-                values[i] = fields[i].type().cast(rs.getObject(i));
+            fieldIds.put(fields[i], i);
+        }
+        keyId = fieldIds.get(key);
     }
 
+    public Row selectSingle(Field<?> field, Object value) {
+        return select(rs -> {
             if(rs.next())
-                SQLConfig.impl.getLogger().log(Level.WARNING, "Statement returned more than one result " + selectBy.get(field).getSql() + " for value " + value);
-
-            return new Row(this, values);
+                return read(rs);
+            return null;
         }, field, value);
     }
 
-    public List<Row> selectMulti(Field field, Object value) {
+    public List<Row> selectMulti(Field<?> field, Object value) {
         return select(rs -> {
             List<Row> result = new ArrayList<>();
-            while(rs.next()) {
-                Object[] values = new Object[fields.length];
-                for(int i = 0; i < fields.length; i++) {
-                    values[i] = fields[i].type().cast(rs.getObject(i));
-                }
+            while(rs.next())
+                result.add(read(rs));
 
-                result.add(new Row(this, values));
-            }
             return result;
         }, field, value);
     }
 
-    public void create() {
-        //TODO and alter table
-    }
-
-    public Field getKey() {
-        return key;
-    }
-
-    private <T> T select(Statement.ResultSetUser<T> u, Field field, Object value) {
+    public void insert(Field<?>[] fields, Object... values) {
         Statement statement;
-        synchronized (selectBy) {
-            statement = selectBy.computeIfAbsent(field, f -> new Statement("SELECT " + Arrays.stream(fields).map(Field::identifier).collect(Collectors.joining(", ")) + " FROM " + name + " WHERE " + field.identifier() + " = ?"));
+        synchronized (cachedInsert) {
+            statement = cachedInsert.computeIfAbsent(fields, fs -> new Statement("INSERT INTO " + name + " (" + Arrays.stream(fs).map(Field::identifier).collect(Collectors.joining(", ")) + ") VALUES (" + Arrays.stream(fs).map(f -> "?").collect(Collectors.joining(", ")) + ")"));
+        }
+        statement.update(values);
+    }
+
+    public void update(Object keyvalue, Field<?>[] fields, Object... values) {
+        Statement statement;
+        synchronized (cachedUpdate) {
+            statement = cachedUpdate.computeIfAbsent(fields, fs -> new Statement("UPDATE " + name + " SET " + Arrays.stream(fs).map(f -> f.identifier() + " = ?").collect(Collectors.joining(", ")) + " WHERE " + key.identifier() + " = ?"));
+        }
+        statement.update(values, keyvalue);
+    }
+
+    public void create() {
+        //TODO syntax mysql/sqlite
+        try (Statement statement = new Statement("CREATE TABLE IF NOT EXISTS " + name + "(" + Arrays.stream(fields).map(field -> field.identifier() + " " + field.sqlType() + (field == key ? " PRIMARY KEY" : "")).collect(Collectors.joining(", ")) + ") STRICT")) {
+            statement.update();
+        }
+    }
+
+    public int keyId() {
+        return keyId;
+    }
+
+    public int getFieldId(Field<?> field) {
+        return fieldIds.get(field);
+    }
+
+    private <T> T select(Statement.ResultSetUser<T> u, Field<?> field, Object value) {
+        Statement statement;
+        synchronized (cachedSelect) {
+            statement = cachedSelect.computeIfAbsent(field, f -> new Statement("SELECT " + Arrays.stream(fields).map(Field::identifier).collect(Collectors.joining(", ")) + " FROM " + name + " WHERE " + field.identifier() + " = ?"));
         }
         return statement.select(u, value);
     }
+
+    private Row read(ResultSet rs) throws SQLException {
+        Object[] values = new Object[fields.length];
+        for(int i = 0; i < fields.length; i++) {
+            values[i] = fields[i].parse(rs);
+        }
+
+        return new Row(this, values);
+    }
 }