Set SQLite pragma to make LIKE matching case sensitive

ChangeLog

@@ -1,4 +1,12 @@
-2917.071: 2.3
+2017.123: 2.4
+	- Update libmseed to 2.19.4.
+	- Update SQLite to 3.18.0.
+	- Add 'PRAGMA case_sensitive_like = ON' for SQLite synchronization.
+	This means that the LIKE queries are performed case sensitive as
+	the should be for the programs usage with the filename column.
+	Importantly, this allows the LIKE matching to use the column index.
+
+2017.071: 2.3
 	- Add -noup (no updates) option to refrain from searching for and
 	deleting existing rows in the database.
 	- Remove double quotes from keys and values of timeindex field

src/mseedindex.c

@@ -81,7 +81,7 @@
  *
  * Written by Chad Trabant, IRIS Data Management Center.
  *
- * modified 2017.071
+ * modified 2017.123
  ***************************************************************************/
 
 #define _GNU_SOURCE
@@ -106,7 +106,7 @@
 
 #include "md5.h"
 
-#define VERSION "2.3"
+#define VERSION "2.4"
 #define PACKAGE "mseedindex"
 
 static flag verbose = 0;
@@ -1087,6 +1087,18 @@ SyncSQLite (void)
     }
   }
 
+  /* Set LIKE operator to be case-sensitive as it should be with file names.
+   * More importantly, this allows the index on the filename column to be used with our LIKEs. */
+  rv = SQLiteExec (dbconn, NULL, NULL, &errmsg,
+                   "PRAGMA case_sensitive_like = ON",
+                   table, table);
+  if (rv != SQLITE_OK)
+  {
+    ms_log (2, "SQLite PRAGMA case_sensitive_like = ON failed: %s\n", (errmsg) ? errmsg : "");
+    sqlite3_free (errmsg);
+    return -1;
+  }
+
   /* Create table if it does not exist */
   rv = SQLiteExec (dbconn, NULL, NULL, &errmsg,
                    "CREATE TABLE IF NOT EXISTS %s "