스프링 jpa & sqlite db 연동

1. dependency 추가

<!-- Maven -->
<dependency>
    <groupId>org.xerial</groupId>
    <artifactId>sqlite-jdbc</artifactId>
    <version>3.34.0</version>
</dependency>

• 버전은 체크 필요

2. hibernate에 SQLite를 위한 dialect 추가

• 파일이름은 config로 하는게 좋음
  참조로 JPA의 구현체인hibernate는 dialect를 이용해서 다양한 DB의 sql문법 차이를 개발자가 신경쓰지않도록 변환해줌

package com.example.demo.config;

import java.sql.Types;

import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.function.VarArgsSQLFunction;
import org.hibernate.type.StringType;

public class SQLDialect extends Dialect {
    public SQLDialect() {
        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.NULL, "null");
        registerColumnType(Types.BLOB, "blob");
        registerColumnType(Types.CLOB, "clob");
        registerColumnType(Types.BOOLEAN, "integer");

        registerFunction("concat", new VarArgsSQLFunction(StringType.INSTANCE, "", "||", ""));
        registerFunction("mod", new SQLFunctionTemplate(StringType.INSTANCE, "?1 % ?2"));
        registerFunction("substr", new StandardSQLFunction("substr", StringType.INSTANCE));
        registerFunction("substring", new StandardSQLFunction("substr", StringType.INSTANCE));
    }

    public boolean supportsIdentityColumns() {
        return true;
    }

    public boolean hasDataTypeInIdentityColumn() {
        return false; // As specify in NHibernate dialect
    }

    public String getIdentityColumnString() {
        // return "integer primary key autoincrement";
        return "integer";
    }

    public String getIdentitySelectString() {
        return "select last_insert_rowid()";
    }

    public boolean supportsLimit() {
        return true;
    }

    protected String getLimitString(String query, boolean hasOffset) {
        return new StringBuffer(query.length() + 20).append(query).append(hasOffset ? " limit ? offset ?" : " limit ?")
                .toString();
    }

    public boolean supportsTemporaryTables() {
        return true;
    }

    public String getCreateTemporaryTableString() {
        return "create temporary table if not exists";
    }

    public boolean dropTemporaryTableAfterUse() {
        return false;
    }

    public boolean supportsCurrentTimestampSelection() {
        return true;
    }

    public boolean isCurrentTimestampSelectStringCallable() {
        return false;
    }

    public String getCurrentTimestampSelectString() {
        return "select current_timestamp";
    }

    public boolean supportsUnionAll() {
        return true;
    }

    public boolean hasAlterTable() {
        return false; // As specify in NHibernate dialect
    }

    public boolean dropConstraints() {
        return false;
    }

    public String getAddColumnString() {
        return "add column";
    }

    public String getForUpdateString() {
        return "";
    }

    public boolean supportsOuterJoinForUpdate() {
        return false;
    }

    public String getDropForeignKeyString() {
        throw new UnsupportedOperationException("No drop foreign key syntax supported by SQLiteDialect");
    }

    public String getAddForeignKeyConstraintString(String constraintName, String[] foreignKey, String referencedTable,
            String[] primaryKey, boolean referencesPrimaryKey) {
        throw new UnsupportedOperationException("No add foreign key syntax supported by SQLiteDialect");
    }

    public String getAddPrimaryKeyConstraintString(String constraintName) {
        throw new UnsupportedOperationException("No add primary key syntax supported by SQLiteDialect");
    }

    public boolean supportsIfExistsBeforeTableName() {
        return true;
    }

    public boolean supportsCascadeDelete() {
        return false;
    }
}

출처: https://skagh.tistory.com/59 [재수강은없다:티스토리]

3. db 설정 추가

• sqlite dialect 지정
• ddl-auto(서버와 DB간의 데이터:테이블 형태 등, 동기화 방법에 대해 정의)
  운영 서버에서는 none 또는 validate를 이용하는것을 권장 - 이유는 찾아봐야
• data source url
• data source driver class name

//SQLite Dialect 지정

spring.jpa.database-platform=com.shinhan.dictionary.config.SQLDialect 

spring.jpa.hibernate.ddl-auto=update

spring.datasource.url=jdbc:sqlite:mydb.db
spring.datasource.driver-class-name=org.sqlite.JDBC
출처: https://skagh.tistory.com/59 [재수강은없다:티스토리]

4. application.properties 에 다음 추가

• .properties 파일은 src > main > resources에 존재함. 없으면 만들기

• datasource url은 아래 링크 보고 참고하기

• https://www.sqlitetutorial.net/sqlite-java/sqlite-jdbc-driver/

spring.jpa.database-platform=com.test.blog.config.SQLDialect
spring.jpa.hibernate.ddl-auto=update

spring.datasource.url=jdbc:sqlite:TBlog.db
spring.datasource.driver-class-name=org.sqlite.JDBC

spring.datasource.username=admin
spring.datasource.password=admin