SQLite with Spring Boot

Added custom dialect for SQLite database.

Simplify spring-data-rest Configuration

Now uses profiles so that learners don't need to uncomment code in
order for demonstrations to work.

Issue: BAEL-2213

spring-data-rest/pom.xml

@@ -33,6 +33,15 @@
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-autoconfigure</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.xerial</groupId>
+            <artifactId>sqlite-jdbc</artifactId>
+            <version>${sqlite.version}</version>
+        </dependency>
         <!-- <dependency> <groupId>org.hsqldb</groupId> <artifactId>hsqldb</artifactId> <version>${hsqldb.version}</version> </dependency> <dependency> <groupId>org.apache.derby</groupId> 
             <artifactId>derby</artifactId> <version>${derby.version}</version> </dependency> <dependency> <groupId>org.xerial</groupId> <artifactId>sqlite-jdbc</artifactId> <version>${sqlite.version}</version> 
             </dependency> -->
@@ -43,6 +52,8 @@
     </build>
 
     <properties>
+        <start-class>com.baeldung.SpringDataRestApplication</start-class>
+        <sqlite.version>3.25.2</sqlite.version>
         <spring-boot.version>2.1.0.RELEASE</spring-boot.version>
     </properties>
 

spring-data-rest/src/main/java/com/baeldung/config/DbConfig.java

@@ -7,6 +7,7 @@ import javax.sql.DataSource;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Profile;
 import org.springframework.context.annotation.PropertySource;
 import org.springframework.core.env.Environment;
 import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
@@ -14,11 +15,12 @@ import org.springframework.jdbc.datasource.DriverManagerDataSource;
 import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
 import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
 
-//@Configuration
+@Configuration
 @EnableJpaRepositories(basePackages = "com.baeldung.repositories")
 // @PropertySource("persistence-h2.properties")
 // @PropertySource("persistence-hsqldb.properties")
 // @PropertySource("persistence-derby.properties")
+//@PropertySource("persistence-sqlite.properties")
 public class DbConfig {
 
     @Autowired
@@ -59,3 +61,25 @@ public class DbConfig {
     }
 
 }
+
+@Configuration
+@Profile("h2")
+@PropertySource("persistence-h2.properties")
+class H2Config {}
+
+@Configuration
+@Profile("hsqldb")
+@PropertySource("persistence-hsqldb.properties")
+class HsqldbConfig {}
+
+
+@Configuration
+@Profile("derby")
+@PropertySource("persistence-derby.properties")
+class DerbyConfig {}
+
+
+@Configuration
+@Profile("sqlite")
+@PropertySource("persistence-sqlite.properties")
+class SqliteConfig {}

spring-data-rest/src/main/java/com/baeldung/dialect/SQLiteDialect.java

@@ -0,0 +1,78 @@
+package com.baeldung.dialect;
+
+import org.hibernate.dialect.Dialect;
+import org.hibernate.dialect.identity.IdentityColumnSupport;
+
+import java.sql.Types;
+
+public class SQLiteDialect extends Dialect {
+
+    public SQLiteDialect() {
+        registerColumnType(Types.BIT, "integer");
+        registerColumnType(Types.TINYINT, "tinyint");
+        registerColumnType(Types.SMALLINT, "smallint");
+        registerColumnType(Types.INTEGER, "integer");
+        registerColumnType(Types.BIGINT, "bigint");
+        registerColumnType(Types.FLOAT, "float");
+        registerColumnType(Types.REAL, "real");
+        registerColumnType(Types.DOUBLE, "double");
+        registerColumnType(Types.NUMERIC, "numeric");
+        registerColumnType(Types.DECIMAL, "decimal");
+        registerColumnType(Types.CHAR, "char");
+        registerColumnType(Types.VARCHAR, "varchar");
+        registerColumnType(Types.LONGVARCHAR, "longvarchar");
+        registerColumnType(Types.DATE, "date");
+        registerColumnType(Types.TIME, "time");
+        registerColumnType(Types.TIMESTAMP, "timestamp");
+        registerColumnType(Types.BINARY, "blob");
+        registerColumnType(Types.VARBINARY, "blob");
+        registerColumnType(Types.LONGVARBINARY, "blob");
+        registerColumnType(Types.BLOB, "blob");
+        registerColumnType(Types.CLOB, "clob");
+        registerColumnType(Types.BOOLEAN, "integer");
+    }
+
+    public IdentityColumnSupport getIdentityColumnSupport() {
+        return new SQLiteIdentityColumnSupport();
+    }
+
+    public boolean hasAlterTable() {
+        return false;
+    }
+
+    public boolean dropConstraints() {
+        return false;
+    }
+
+    public String getDropForeignKeyString() {
+        return "";
+    }
+
+    public String getAddForeignKeyConstraintString(String constraintName, String[] foreignKey, String referencedTable, String[] primaryKey, boolean referencesPrimaryKey) {
+        return "";
+    }
+
+    public String getAddPrimaryKeyConstraintString(String constraintName) {
+        return "";
+    }
+
+    public String getForUpdateString() {
+        return "";
+    }
+
+    public String getAddColumnString() {
+        return "add column";
+    }
+
+    public boolean supportsOuterJoinForUpdate() {
+        return false;
+    }
+
+    public boolean supportsIfExistsBeforeTableName() {
+        return true;
+    }
+
+    public boolean supportsCascadeDelete() {
+        return false;
+    }
+}

spring-data-rest/src/main/java/com/baeldung/dialect/SQLiteIdentityColumnSupport.java

@@ -0,0 +1,22 @@
+package com.baeldung.dialect;
+
+import org.hibernate.MappingException;
+import org.hibernate.dialect.identity.IdentityColumnSupportImpl;
+
+public class SQLiteIdentityColumnSupport extends IdentityColumnSupportImpl {
+
+    @Override
+    public boolean supportsIdentityColumns() {
+        return true;
+    }
+
+    @Override
+    public String getIdentitySelectString(String table, String column, int type) throws MappingException {
+        return "select last_insert_rowid()";
+    }
+
+    @Override
+    public String getIdentityColumnString(int type) throws MappingException {
+        return "integer";
+    }
+}

spring-data-rest/src/main/resources/application.properties

@@ -0,0 +1 @@
+spring.profiles.default=h2

spring-data-rest/src/main/resources/persistence-sqlite.properties

@@ -1,4 +1,7 @@
 driverClassName=org.sqlite.JDBC
-url=jdbc:sqlite:memory:myDb
+url=jdbc:sqlite:memory:myDb?cache=shared
 username=sa
-password=sa
+password=sa
+hibernate.dialect=com.baeldung.dialect.SQLiteDialect
+hibernate.hbm2ddl.auto=create-drop
+hibernate.show_sql=true