add support for fts tables to qlite

qlite/src/database.vala

@@ -90,6 +90,11 @@ public class Database {
         return new QueryBuilder(this).select(columns);
     }
 
+    internal MatchQueryBuilder match_query(Table table) {
+        ensure_init();
+        return new MatchQueryBuilder(this, table);
+    }
+
     public InsertBuilder insert() {
         ensure_init();
         return new InsertBuilder(this);

qlite/src/query_builder.vala

@@ -10,12 +10,15 @@ public class QueryBuilder : StatementBuilder {
     private Column[] columns = {};
 
     // FROM [...]
-    private Table? table;
-    private string? table_name;
+    protected Table? table;
+    protected string? table_name;
+
+    // JOIN [...]
+    private string joins = "";
 
     // WHERE [...]
-    private string selection = "1";
-    private StatementBuilder.AbstractField[] selection_args = {};
+    protected string selection = "1";
+    internal StatementBuilder.AbstractField[] selection_args = {};
 
     // ORDER BY [...]
     private OrderingTerm[]? order_by_terms = {};
@@ -50,18 +53,23 @@ public class QueryBuilder : StatementBuilder {
         return this;
     }
 
-    public QueryBuilder from(Table table) {
+    public virtual QueryBuilder from(Table table) {
         if (this.table_name != null) error("cannot use from() multiple times.");
         this.table = table;
         this.table_name = table.name;
         return this;
     }
 
-    public QueryBuilder from_name(string table) {
+    public virtual QueryBuilder from_name(string table) {
         this.table_name = table;
         return this;
     }
 
+    public QueryBuilder join(string table, string on) {
+        joins += @"JOIN $table ON $on";
+        return this;
+    }
+
     public QueryBuilder where(string selection, string[] selection_args = {}) {
         if (this.selection != "1") error("selection was already done, but where() was called.");
         this.selection = selection;
@@ -74,17 +82,17 @@ public class QueryBuilder : StatementBuilder {
     public QueryBuilder with<T>(Column<T> column, string comp, T value) {
         if ((column.unique || column.primary_key) && comp == "=") single_result = true;
         selection_args += new Field<T>(column, value);
-        selection = @"($selection) AND $(column.name) $comp ?";
+        selection = @"($selection) AND $table_name.$(column.name) $comp ?";
         return this;
     }
 
     public QueryBuilder with_null<T>(Column<T> column) {
-        selection = @"($selection) AND $(column.name) ISNULL";
+        selection = @"($selection) AND $table_name.$(column.name) ISNULL";
         return this;
     }
 
     public QueryBuilder without_null<T>(Column<T> column) {
-        selection = @"($selection) AND $(column.name) NOT NULL";
+        selection = @"($selection) AND $table_name.$(column.name) NOT NULL";
         return this;
     }
 
@@ -135,7 +143,7 @@ public class QueryBuilder : StatementBuilder {
     }
 
     internal override Statement prepare() {
-        Statement stmt = db.prepare(@"SELECT $column_selector $(table_name == null ? "" : @"FROM $((!) table_name)") WHERE $selection $(OrderingTerm.all_to_string(order_by_terms)) $(limit_val > 0 ? @" LIMIT $limit_val OFFSET $offset_val" : "")");
+        Statement stmt = db.prepare(@"SELECT $column_selector $(table_name == null ? "" : @"FROM $((!) table_name)") $joins WHERE $selection $(OrderingTerm.all_to_string(order_by_terms)) $(limit_val > 0 ? @" LIMIT $limit_val OFFSET $offset_val" : "")");
         for (int i = 0; i < selection_args.length; i++) {
             selection_args[i].bind(stmt, i+1);
         }
@@ -177,4 +185,21 @@ public class QueryBuilder : StatementBuilder {
     }
 }
 
+public class MatchQueryBuilder : QueryBuilder {
+    internal MatchQueryBuilder(Database db, Table table) {
+        base(db);
+        if (table.fts_columns == null) error("MATCH query on non FTS table");
+        from(table);
+        join(@"_fts_$table_name", @"_fts_$table_name.docid = $table_name.rowid");
+    }
+
+    public MatchQueryBuilder match(Column<string> column, string match) {
+        if (table == null) error("MATCH must occur after FROM statement");
+        if (!(column in table.fts_columns)) error("MATCH selection on non FTS column");
+        selection_args += new StatementBuilder.StringField(match);
+        selection = @"($selection) AND _fts_$table_name.$(column.name) MATCH ?";
+        return this;
+    }
+}
+
 }

qlite/src/table.vala

@@ -8,6 +8,8 @@ public class Table {
     protected Column[]? columns;
     private string constraints = "";
     private string[] post_statements = {};
+    private string[] create_statements = {};
+    internal Column[]? fts_columns;
 
     public Table(Database db, string name) {
         this.db = db;
@@ -19,6 +21,33 @@ public class Table {
         this.constraints = constraints;
     }
 
+    public void fts(Column[] columns) {
+        if (fts_columns != null) error("Only one FTS index may be used per table.");
+        fts_columns = columns;
+        string cs = "";
+        string cnames = "";
+        string cnews = "";
+        foreach (Column c in columns) {
+            cs += @", $c";
+            cnames += @", $(c.name)";
+            cnews += @", new.$(c.name)";
+        }
+        add_create_statement(@"CREATE VIRTUAL TABLE IF NOT EXISTS _fts_$name USING fts4(tokenize=unicode61, content=\"$name\"$cs)");
+        add_post_statement(@"CREATE TRIGGER IF NOT EXISTS _fts_bu_$(name) BEFORE UPDATE ON $name BEGIN DELETE FROM _fts_$name WHERE docid=old.rowid; END");
+        add_post_statement(@"CREATE TRIGGER IF NOT EXISTS _fts_bd_$(name) BEFORE DELETE ON $name BEGIN DELETE FROM _fts_$name WHERE docid=old.rowid; END");
+        add_post_statement(@"CREATE TRIGGER IF NOT EXISTS _fts_au_$(name) AFTER UPDATE ON $name BEGIN INSERT INTO _fts_$name(docid$cnames) VALUES(new.rowid$cnews); END");
+        add_post_statement(@"CREATE TRIGGER IF NOT EXISTS _fts_ai_$(name) AFTER INSERT ON $name BEGIN INSERT INTO _fts_$name(docid$cnames) VALUES(new.rowid$cnews); END");
+    }
+
+    public void fts_rebuild() {
+        if (fts_columns == null) error("FTS not available on this table.");
+        try {
+            db.exec(@"INSERT INTO _fts_$name(_fts_$name) VALUES('rebuild');");
+        } catch (Error e) {
+            error("Qlite Error: Rebuilding FTS index");
+        }
+    }
+
     public void unique(Column[] columns, string? on_conflict = null) {
         constraints += ", UNIQUE (";
         bool first = true;
@@ -37,6 +66,10 @@ public class Table {
         post_statements += stmt;
     }
 
+    public void add_create_statement(string stmt) {
+        create_statements += stmt;
+    }
+
     public void index(string index_name, Column[] columns, bool unique = false) {
         string stmt = @"CREATE $(unique ? "UNIQUE" : "") INDEX IF NOT EXISTS $index_name ON $name (";
         bool first = true;
@@ -58,6 +91,15 @@ public class Table {
         return db.select(columns).from(this);
     }
 
+    private MatchQueryBuilder match_query() {
+        ensure_init();
+        return db.match_query(this);
+    }
+
+    public MatchQueryBuilder match(Column<string> column, string query) {
+        return match_query().match(column, query);
+    }
+
     public InsertBuilder insert() {
         ensure_init();
         return db.insert().into(this);
@@ -107,6 +149,13 @@ public class Table {
         } catch (Error e) {
             error("Qlite Error: Create table at version");
         }
+        foreach (string stmt in create_statements) {
+            try {
+                db.exec(stmt);
+            } catch (Error e) {
+                error("Qlite Error: Create table at version");
+            }
+        }
     }
 
     public void add_columns_for_version(long old_version, long new_version) {