example

crystal/examples/sqlite/all.cr

@@ -0,0 +1,51 @@
+require "sqlite3"
+db_file = "data.db"
+
+create_db(db_file)
+insert_data(db_file, "Foo", true, 19)
+
+def create_db(db_file)
+  if File.exists?(db_file)
+    return
+  end
+  begin
+    DB.open "sqlite3://#{db_file}" do |db|
+        db.exec "CREATE TABLE information (
+            id INTEGER PRIMARY KEY,
+            name TEXT,
+            isit BOOLEAN,
+            number INTEGER
+        )"
+    end
+  rescue err
+    puts "Exception #{err}"
+  end
+end
+
+def insert_data(db_file, name, isit, number)
+  args = [name, isit, number]
+  begin
+    DB.open "sqlite3://#{db_file}" do |db|
+        db.exec "INSERT INTO information
+                 (name, isit, number)
+                 VALUES (?, ?, ?)", args: args
+    end
+  rescue err
+    puts "Exception #{err}"
+  end
+end
+
+def get_max
+  return db.scalar "SELECT max(number) FROM information"
+end
+
+def get_data(db_file)
+    DB.open "sqlite3://#{db_file}" do |db|
+        db.exec "SELECT * FROM information"
+    end
+  rescue err
+    puts "Exception #{err}"
+end
+
+
+

crystal/examples/sqlite/in_memory.cr

@@ -0,0 +1,32 @@
+require "sqlite3"
+
+DB.open "sqlite3://%3Amemory%3A" do |db|
+    db.exec "CREATE TABLE data (
+        id INTEGER PRIMARY KEY,
+        name TEXT,
+        yesno BOOLEAN,
+        number INTEGER,
+        start DATETIME
+    )"
+    db.exec "INSERT INTO data (name, yesno, number, start) VALUES (?, ?, ?, ?)",
+        "Foo", true, 42, Time.utc
+    name = db.scalar "SELECT name FROM data"
+    puts name
+    puts typeof(name)
+    puts name.to_s + " and Bar"
+
+    number = db.scalar "SELECT number FROM data"
+    puts number
+    puts typeof(number)
+    puts number.to_s.to_i + 1
+
+    db.exec "INSERT INTO data (name, yesno, number, start) VALUES (?, ?, ?, ?)",
+        "Bar", false, 23, Time.utc
+    name = db.scalar "SELECT name FROM data"
+    puts name
+
+    count = db.scalar "SELECT COUNT(*) FROM data"
+    puts count
+    puts typeof(count)
+
+end

crystal/sqlite.md

@@ -2,7 +2,7 @@
 {id: sqlite}
 
 ## Try SQLite
-{id: try-sqlite}
+{id: sqlite-try}
 {i: SQLite}
 
 * You need to install the development package for libsqlite3
@@ -16,29 +16,40 @@ sudo apt-get install libsqlite3-dev
 
 
 ## Multi-counter with SQLite
-{id: multi-counter-sqlite}
+{id: sqlite-multi-counter}
 {i: SQLite}
 
 ![](examples/sqlite/multi_counter_sqlite.cr)
 
 Unhandled exception issue: https://github.com/crystal-lang/crystal-sqlite3/issues/52
 
 ## SQLite last_id last_insert_id
-{id: last-insert-id}
+{id: sqlite-last-insert-id}
 {i: last_id}
 {i: last_insert_id}
 
 ![](examples/sqlite/last_id.cr)
 
 ## SQLite UPDATE row_affected
-{id: update-row-affected}
+{id: sqlite-update-row-affected}
 
 ![](examples/sqlite/rows_affected.cr)
 
 ## SQLite exception handling (during INSERT)
-{id: exception-handling}
+{id: sqlite-exception-handling}
 
 * The internal exception handling should be enough, but apparently it is not
 * See [this](https://github.com/crystal-lang/crystal-sqlite3/issues/52) report
 
 ![](examples/sqlite/insert_exception.cr)
+
+## SQLite all
+{id: sqlite-all}
+
+![](examples/sqlite/all.cr)
+
+## SQLite in memory
+{id: sqlite-in-memory}
+
+![](examples/sqlite/in_memory.cr)
+