JDBC logging and safety improvements (#1117)

* Use `PreparedStatement` instead of `Statement` for queries.

* Add SQL injection validation. Phase 1

* Add strict validation parameter to SQL reading functions

Introduces a new `strictValidation` parameter to SQL reading methods, defaulting to `true`, to ensure table names and queries follow a valid format. If disabled, a warning is logged, granting users flexibility while maintaining safety by default.

* Improve SQL injection prevention and validation mechanisms

* Format code and apply `@Ignore` to ignored tests

* Format code and apply `@Ignore` to ignored tests

* Support Unicode table names in SQL operations

Added handling and tests for tables with Unicode names in `readSqlTable`. Updated the table name validation regex to support Unicode letters, enhancing compatibility with diverse database naming conventions.

* Fixing linter

Author: zaleslaw

dataframe-jdbc/api/dataframe-jdbc.api

@@ -54,26 +54,26 @@ public final class org/jetbrains/kotlinx/dataframe/io/ReadJdbcKt {
 	public static final fun readAllSqlTables (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;)Ljava/util/Map;
 	public static synthetic fun readAllSqlTables$default (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Ljava/sql/Connection;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ILjava/lang/Object;)Ljava/util/Map;
 	public static synthetic fun readAllSqlTables$default (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ILjava/lang/Object;)Ljava/util/Map;
-	public static final fun readDataFrame (Ljava/sql/Connection;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
+	public static final fun readDataFrame (Ljava/sql/Connection;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;Z)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
 	public static final fun readDataFrame (Ljava/sql/ResultSet;Ljava/sql/Connection;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
 	public static final fun readDataFrame (Ljava/sql/ResultSet;Lorg/jetbrains/kotlinx/dataframe/io/db/DbType;IZ)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
-	public static final fun readDataFrame (Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
-	public static synthetic fun readDataFrame$default (Ljava/sql/Connection;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
+	public static final fun readDataFrame (Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;Z)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
+	public static synthetic fun readDataFrame$default (Ljava/sql/Connection;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ZILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
 	public static synthetic fun readDataFrame$default (Ljava/sql/ResultSet;Ljava/sql/Connection;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
 	public static synthetic fun readDataFrame$default (Ljava/sql/ResultSet;Lorg/jetbrains/kotlinx/dataframe/io/db/DbType;IZILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
-	public static synthetic fun readDataFrame$default (Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
+	public static synthetic fun readDataFrame$default (Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ZILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
 	public static final fun readResultSet (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Ljava/sql/ResultSet;Ljava/sql/Connection;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
 	public static final fun readResultSet (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Ljava/sql/ResultSet;Lorg/jetbrains/kotlinx/dataframe/io/db/DbType;IZ)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
 	public static synthetic fun readResultSet$default (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Ljava/sql/ResultSet;Ljava/sql/Connection;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
 	public static synthetic fun readResultSet$default (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Ljava/sql/ResultSet;Lorg/jetbrains/kotlinx/dataframe/io/db/DbType;IZILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
-	public static final fun readSqlQuery (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Ljava/sql/Connection;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
-	public static final fun readSqlQuery (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
-	public static synthetic fun readSqlQuery$default (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Ljava/sql/Connection;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
-	public static synthetic fun readSqlQuery$default (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
-	public static final fun readSqlTable (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Ljava/sql/Connection;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
-	public static final fun readSqlTable (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
-	public static synthetic fun readSqlTable$default (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Ljava/sql/Connection;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
-	public static synthetic fun readSqlTable$default (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
+	public static final fun readSqlQuery (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Ljava/sql/Connection;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;Z)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
+	public static final fun readSqlQuery (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;Z)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
+	public static synthetic fun readSqlQuery$default (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Ljava/sql/Connection;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ZILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
+	public static synthetic fun readSqlQuery$default (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ZILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
+	public static final fun readSqlTable (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Ljava/sql/Connection;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;Z)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
+	public static final fun readSqlTable (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;Z)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
+	public static synthetic fun readSqlTable$default (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Ljava/sql/Connection;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ZILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
+	public static synthetic fun readSqlTable$default (Lorg/jetbrains/kotlinx/dataframe/DataFrame$Companion;Lorg/jetbrains/kotlinx/dataframe/io/DbConnectionConfig;Ljava/lang/String;IZLorg/jetbrains/kotlinx/dataframe/io/db/DbType;ZILjava/lang/Object;)Lorg/jetbrains/kotlinx/dataframe/DataFrame;
 }
 
 public final class org/jetbrains/kotlinx/dataframe/io/TableColumnMetadata {

dataframe-jdbc/src/main/kotlin/org/jetbrains/kotlinx/dataframe/io/db/util.kt

@@ -25,8 +25,8 @@ public fun extractDBTypeFromConnection(connection: Connection): DbType {
         // works only for H2 version 2
         val modeQuery = "SELECT SETTING_VALUE FROM INFORMATION_SCHEMA.SETTINGS WHERE SETTING_NAME = 'MODE'"
         var mode = ""
-        connection.createStatement().use { st ->
-            st.executeQuery(modeQuery).use { rs ->
+        connection.prepareStatement(modeQuery).use { st ->
+            st.executeQuery().use { rs ->
                 if (rs.next()) {
                     mode = rs.getString("SETTING_VALUE")
                     logger.debug { "Fetched H2 DB mode: $mode" }