Add DUMP DATABASE command to export database as SQL script

build.sh

@@ -103,6 +103,7 @@ cat \
 	src/76usedatabase.js	\
 	src/77declare.js		\
 	src/78show.js			\
+	src/79dump.js			\
 	src/79set.js			\
 	src/80console.js		\
 	src/81commit.js			\

src/79dump.js

@@ -0,0 +1,104 @@
+// DUMP DATABASE databaseid
+// or DUMP (for current database)
+
+yy.DumpDatabase = function (params) {
+	return Object.assign(this, params);
+};
+
+yy.DumpDatabase.prototype.toString = function () {
+	var s = 'DUMP';
+	if (this.databaseid) {
+		s += ' DATABASE ' + this.databaseid;
+	}
+	return s;
+};
+
+yy.DumpDatabase.prototype.execute = function (databaseid, params, cb) {
+	var dbid = this.databaseid || databaseid;
+	var db = alasql.databases[dbid];
+
+	if (!db) {
+		throw new Error("Database '" + dbid + "' does not exist");
+	}
+
+	var sql = '';
+
+	// Iterate through all tables in the database
+	for (var tableid in db.tables) {
+		var table = db.tables[tableid];
+
+		// Generate CREATE TABLE statement
+		sql += 'CREATE TABLE ' + tableid + ' (';
+		var ss = [];
+
+		if (table.columns && table.columns.length > 0) {
+			table.columns.forEach(function (col) {
+				var a = col.columnid + ' ' + (col.dbtypeid || col.typeid || 'STRING');
+				if (col.dbsize) a += '(' + col.dbsize + ')';
+				if (col.primarykey) a += ' PRIMARY KEY';
+				// TODO: Add more column properties like NOT NULL, DEFAULT, etc.
+				ss.push(a);
+			});
+			sql += ss.join(', ');
+		}
+
+		sql += ');\n';
+
+		// Generate INSERT statements for table data
+		if (table.data && table.data.length > 0) {
+			var columns = table.columns || [];
+
+			// If no columns defined, infer from first data row
+			if (columns.length === 0 && table.data.length > 0) {
+				columns = Object.keys(table.data[0]).map(function (columnid) {
+					return {columnid: columnid};
+				});
+			}
+
+			// Generate INSERT statements
+			for (var i = 0; i < table.data.length; i++) {
+				sql += 'INSERT INTO ' + tableid + '(';
+				sql += columns
+					.map(function (col) {
+						return col.columnid;
+					})
+					.join(',');
+				sql += ') VALUES (';
+				sql += columns
+					.map(function (col) {
+						var val = table.data[i][col.columnid];
+						// Handle null, undefined, and NaN values
+						if (
+							val === null ||
+							val === undefined ||
+							(typeof val === 'number' && Number.isNaN(val))
+						) {
+							return 'NULL';
+						}
+						// Check if value should be escaped as a string
+						var shouldEscape =
+							(col.typeid &&
+								(col.typeid === 'STRING' ||
+									col.typeid === 'VARCHAR' ||
+									col.typeid === 'NVARCHAR' ||
+									col.typeid === 'CHAR' ||
+									col.typeid === 'NCHAR')) ||
+							typeof val == 'string';
+						if (shouldEscape) {
+							val = "'" + escapeqq(val) + "'";
+						}
+						return val;
+					})
+					.join(',');
+				sql += ');\n';
+			}
+		}
+
+		sql += '\n';
+	}
+
+	if (cb) {
+		return cb(sql);
+	}
+	return sql;
+};

src/alasqlparser.jison

@@ -120,6 +120,7 @@ DATABASE(S)?									return 'DATABASE'
 'DISTINCT'                                      return 'DISTINCT'
 /* DOUBLE\s+PRECISION								return 'LITERAL' */
 'DROP'											return 'DROP'
+'DUMP'											return 'DUMP'
 'ECHO'											return 'ECHO'
 'EDGE'											return 'EDGE'
 'END'											return 'END'
@@ -420,6 +421,7 @@ Statement
 	| DropIndex
 	| DropTable
 	| DropView
+	| DumpDatabase
 	| If
 	| Insert
 	| Merge
@@ -2279,6 +2281,13 @@ UseDatabase
 		{ $$ = new yy.UseDatabase({databaseid: $2 });}
 	;
 
+DumpDatabase
+	: DUMP DATABASE Literal
+		{ $$ = new yy.DumpDatabase({databaseid: $3 });}
+	| DUMP
+		{ $$ = new yy.DumpDatabase();}
+	;
+
 DropDatabase
 	: DROP DATABASE IfExists Literal
 		{ $$ = new yy.DropDatabase({databaseid: $4 }); yy.extend($$,$3); }