SL3Connection: Add a way to prepare statements

FossilOrigin-Name: c64a1aa6faddaa64012516ff343bdadd114618fb7e3164beafdd9a00e38333ea

src/SL3Connection.m

@@ -21,6 +21,7 @@
  */
 
 #import "SL3Connection.h"
+#import "SL3PreparedStatement.h"
 
 #import "SL3OpenFailedException.h"
 
@@ -69,4 +70,11 @@
 
 	[super dealloc];
 }
+
+- (SL3PreparedStatement *)prepareStatement: (OFConstantString *)SQL
+{
+	return [[[SL3PreparedStatement alloc]
+	    sl3_initWithConnection: self
+		      SQLStatement: SQL] autorelease];
+}
 @end