package liquibase.sqlgenerator.core;
import liquibase.database.Database;
import liquibase.database.core.InformixDatabase;
import liquibase.database.core.MySQLDatabase;
import liquibase.exception.ValidationErrors;
import liquibase.sql.Sql;
import liquibase.sql.UnparsedSql;
import liquibase.sqlgenerator.SqlGenerator;
import liquibase.sqlgenerator.SqlGeneratorChain;
import liquibase.sqlgenerator.SqlGeneratorFactory;
import liquibase.statement.SqlStatement;
import liquibase.statement.core.TagDatabaseStatement;
import liquibase.statement.core.UpdateStatement;
public class TagDatabaseGenerator extends AbstractSqlGenerator<TagDatabaseStatement> {
public ValidationErrors validate(TagDatabaseStatement tagDatabaseStatement, Database database, SqlGeneratorChain sqlGeneratorChain) {
ValidationErrors validationErrors = new ValidationErrors();
validationErrors.checkRequiredField("tag", tagDatabaseStatement.getTag());
return validationErrors;
}
public Sql[] generateSql(TagDatabaseStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
String liquibaseSchema = null;
liquibaseSchema = database.getLiquibaseSchemaName();
UpdateStatement updateStatement = new UpdateStatement(liquibaseSchema, database.getDatabaseChangeLogTableName());
updateStatement.addNewColumnValue("TAG", statement.getTag());
if (database instanceof MySQLDatabase) {
try {
long version = Long.parseLong(database.getDatabaseProductVersion().substring(0, 1));
if (version < 5) {
return new Sql[]{
new UnparsedSql("UPDATE "+database.escapeTableName(database.getLiquibaseSchemaName(), database.getDatabaseChangeLogTableName())+" C LEFT JOIN (SELECT MAX(DATEEXECUTED) as MAXDATE FROM (SELECT DATEEXECUTED FROM `DATABASECHANGELOG`) AS X) D ON C.DATEEXECUTED = D.MAXDATE SET C.TAG = '" + statement.getTag() + "' WHERE D.MAXDATE IS NOT NULL")
};
}
} catch (Throwable e) {
; //assume it is version 5
}
updateStatement.setWhereClause("DATEEXECUTED = (SELECT MAX(DATEEXECUTED) FROM (SELECT DATEEXECUTED FROM " + database.escapeTableName(liquibaseSchema, database.getDatabaseChangeLogTableName()) + ") AS X)");
} else if (database instanceof InformixDatabase) {
return new Sql[]{
new UnparsedSql("SELECT MAX(dateexecuted) max_date FROM " + database.escapeTableName(liquibaseSchema, database.getDatabaseChangeLogTableName()) + " INTO TEMP max_date_temp WITH NO LOG"),
new UnparsedSql("UPDATE "+database.escapeTableName(liquibaseSchema, database.getDatabaseChangeLogTableName())+" SET TAG = '"+statement.getTag()+"' WHERE DATEEXECUTED = (SELECT max_date FROM max_date_temp);"),
new UnparsedSql("DROP TABLE max_date_temp;")
};
} else {
updateStatement.setWhereClause("DATEEXECUTED = (SELECT MAX(DATEEXECUTED) FROM " + database.escapeTableName(liquibaseSchema, database.getDatabaseChangeLogTableName()) + ")");
}
return SqlGeneratorFactory.getInstance().generateSql(updateStatement, database);
}
}