org.tentackle.sql.Backend Maven / Gradle / Ivy
/*
* Tentackle - https://tentackle.org
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.tentackle.sql;
import org.tentackle.sql.metadata.ColumnMetaData;
import org.tentackle.sql.metadata.DatabaseMetaDataTableHeader;
import org.tentackle.sql.metadata.IndexColumnMetaData;
import org.tentackle.sql.metadata.IndexMetaData;
import org.tentackle.sql.metadata.ModelMetaData;
import org.tentackle.sql.metadata.TableMetaData;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Collection;
import java.util.List;
import java.util.Set;
/**
* A database backend.
* Defines the backend specifics.
* There is only one instance per database type.
* Implementations must not maintain any state except for the whole of all connections to the
* specific kind of database.
*
* @author harald
*/
public interface Backend {
/** WHERE string. */
String SQL_WHERE = " WHERE ";
/** SELECT string. */
String SQL_SELECT = "SELECT ";
/** SELECT * FROM string. */
String SQL_SELECT_ALL_FROM = "SELECT * FROM ";
/** DELETE string. */
String SQL_DELETE = "DELETE ";
/** UPDATE string. */
String SQL_UPDATE = "UPDATE ";
/** INSERT INTO string. */
String SQL_INSERT_INTO = "INSERT INTO ";
/** opening bracket. */
String SQL_LEFT_PARENTHESIS = " (";
/** closing bracket. */
String SQL_RIGHT_PARENTHESIS = ") ";
/** (VALUES) string for insert. */
String SQL_INSERT_VALUES = SQL_RIGHT_PARENTHESIS + "VALUES" + SQL_LEFT_PARENTHESIS;
/** SET string. */
String SQL_SET = " SET ";
/** FROM string. */
String SQL_FROM = " FROM ";
/** AND string. */
String SQL_AND = " AND ";
/** OR string. */
String SQL_OR = " OR ";
/** NOT string. */
String SQL_NOT = "NOT ";
/** AND NOT string. */
String SQL_ANDNOT = SQL_AND + SQL_NOT;
/** OR NOT string. */
String SQL_ORNOT = SQL_OR + SQL_NOT;
/** comma separator. */
String SQL_COMMA = ",";
/** ? string. */
String SQL_PAR = "?";
/** Array parameter (?). */
String SQL_ARRAY_PAR = "(?)";
/** = operator string. */
String SQL_EQUAL = "=";
/** <> operator string. */
String SQL_NOTEQUAL = "<>";
/** < operator string. */
String SQL_LESS = "<";
/** > operator string. */
String SQL_GREATER = ">";
/** <= operator string. */
String SQL_LESSOREQUAL = "<=";
/** >= operator string. */
String SQL_GREATEROREQUAL = ">=";
/** LIKE operator string. */
String SQL_LIKE = " LIKE ";
/** NOT LIKE operator string. */
String SQL_NOTLIKE = " NOT LIKE ";
/** IN array operator string. */
String SQL_ARRAY_IN = "IN";
/** NOT IN array operator string. */
String SQL_ARRAY_NOT_IN = "NOT IN";
/** ANY array operator string. */
String SQL_ARRAY_ANY = "ANY";
/** ALL array operator string. */
String SQL_ARRAY_ALL = "ALL";
/** =0 string. */
String SQL_EQUAL_ZERO = SQL_EQUAL + "0";
/** <>0 string. */
String SQL_NOTEQUAL_ZERO = SQL_NOTEQUAL + "0";
/** Parameter ,? string. */
String SQL_COMMA_PAR = SQL_COMMA + SQL_PAR;
/** Parameter ?, string. */
String SQL_PAR_COMMA = SQL_PAR + SQL_COMMA;
/** Parameter =? string. */
String SQL_EQUAL_PAR = SQL_EQUAL + SQL_PAR;
/** Parameter =?, string. */
String SQL_EQUAL_PAR_COMMA = SQL_EQUAL + SQL_PAR + SQL_COMMA;
/** Parameter <>? string. */
String SQL_NOTEQUAL_PAR = SQL_NOTEQUAL + SQL_PAR;
/** Parameter >? string. */
String SQL_GREATER_PAR = SQL_GREATER + SQL_PAR;
/** Parameter ≥? string. */
String SQL_GREATEROREQUAL_PAR = SQL_GREATEROREQUAL + SQL_PAR;
/** Parameter <? string. */
String SQL_LESS_PAR = SQL_LESS + SQL_PAR;
/** Parameter <=? string. */
String SQL_LESSOREQUAL_PAR = SQL_LESSOREQUAL + SQL_PAR;
/** Parameter LIKE ? string. */
String SQL_LIKE_PAR = SQL_LIKE + SQL_PAR;
/** Parameter NOT LIKE ? string. */
String SQL_NOTLIKE_PAR = SQL_NOTLIKE + SQL_PAR;
/** Parameter IN array operator string. */
String SQL_ARRAY_IN_PAR = " " + SQL_ARRAY_IN + SQL_ARRAY_PAR;
/** Parameter NOT IN array operator string. */
String SQL_ARRAY_NOT_IN_PAR = " " + SQL_ARRAY_NOT_IN + SQL_ARRAY_PAR;
/** Parameter ANY array operator string. */
String SQL_ARRAY_ANY_PAR = SQL_ARRAY_ANY + SQL_ARRAY_PAR;
/** Parameter ALL array operator string. */
String SQL_ARRAY_ALL_PAR = SQL_ARRAY_ALL + SQL_ARRAY_PAR;
/** '*' all string. */
String SQL_ALLSTAR = "*";
/** +1 string. */
String SQL_PLUS_ONE = "+1";
/** "WHERE 1=1" allows AND to be added. */
String SQL_WHEREALL = SQL_WHERE + "1=1";
/** "WHERE 1=0" to select nothing. */
String SQL_WHERENOTHING = SQL_WHERE + "1=0";
/** SQL_WHEREALL + AND will be replaced by... SQL_WHERE. */
String SQL_WHEREAND = SQL_WHEREALL + SQL_AND;
/** SQL_WHEREALL + OR will be replaced by... SQL_WHERE. */
String SQL_WHEREOR = SQL_WHEREALL + SQL_OR;
/** IS NULL string. */
String SQL_ISNULL = " IS NULL";
/** IS NOT NULL string. */
String SQL_ISNOTNULL = " IS NOT NULL";
/** ORDER BY string. */
String SQL_ORDERBY = " ORDER BY ";
/** sort ASC string. */
String SQL_SORTASC = " ASC";
/** sort DESC string. */
String SQL_SORTDESC = " DESC";
/** GROUP BY string. */
String SQL_GROUPBY = " GROUP BY ";
/** MAX function name. */
String SQL_MAX = "MAX";
/** MAX function name. */
String SQL_MIN = "MIN";
/** SQL EXISTS clause with SELECT 1 and opening left parenthesis. */
String SQL_EXISTS = "EXISTS (SELECT 1 FROM ";
/** SQL ALTER TABLE intro. */
String SQL_ALTER_TABLE = "ALTER TABLE ";
/** SQL ALTER INDEX intro. */
String SQL_ALTER_INDEX = "ALTER INDEX ";
/** SQL ALTER COLUMN fragment. */
String SQL_ALTER_COLUMN = " ALTER COLUMN ";
/** SQL IF EXISTS fragment. */
String SQL_IF_EXISTS = "IF EXISTS ";
/**
* Checks whether the backend belongs to the given jdbc url.
* If multiple backend implementations are provided for the same database type,
* only one backend should match the URL. The others must be selected via name.
*
* @param url the jdbc url
* @return true if matches
*/
boolean isMatchingUrl(String url);
/**
* Checks whether the backend belongs to the given name.
*
* @param name the backend's name
* @return true if matches
*/
boolean isMatchingName(String name);
/**
* Gets the name of the backend.
*
* @return the name
*/
String getName();
/**
* Gets the JDBC driver class name.
*
* @return the class name
*/
String getDriverClassName();
/**
* Creates a jdbc connection.
*
* @param url the jdbc url
* @param username the username
* @param password the password
* @return the created connection
* @throws SQLException if connection could not be established
*/
Connection createConnection(String url, String username, char[] password) throws SQLException;
/**
* Gets the metadata from the backend.
*
* Important: the connection of the metadata is open!
*
* @param backendInfo the backend info
* @return the metadata, may be more than one if schemas set in backendInfo
* @throws SQLException if failed
*/
DatabaseMetaData[] getMetaData(BackendInfo backendInfo) throws SQLException;
/**
* Gets all table headers for a given metadata.
*
* @param metaData the database metadata
* @return the list of table headers
* @throws SQLException if failed
*/
List getTableHeaders(DatabaseMetaData metaData) throws SQLException;
/**
* Checks whether this is a temporary name.
* Returns whether an entity-, attribute- or index-name is temporary and should not
* be taken into account for migration or even used in the model.
* Depending on the backend, temporary names start with an underscore or some other
* lead string.
*
* @param name the name
* @return true temporary (invalid) name
*/
boolean isTemporaryName(String name);
/**
* Checks whether this a reserved table name for this backend.
* Applies only to tables. Not to be mixed up with {@link #getReservedWords()}.
* Useful to avoid conflicts with naming conventions for backend specific things,
* such as snapshots.
*
* @param name the table name
* @return true if reserved by backend
*/
boolean isReservedTableName(String name);
/**
* Checks whether this is a reserved schema name for this backend.
*
* @param name the schema name
* @return true if reserved by backend
*/
boolean isReservedSchemaName(String name);
/**
* Creates a select statement string from an inner sql string.
*
* {@code sqlBuilder} is anything as {@code FROM... WHERE... ORDER BY...}.
* It is decorated with a leading {@code SELECT} plus optional clauses
* like for the given parameters.
*
* @param sqlBuilder the sql builder, initially containing the inner sql without leading {@code SELECT}.
* @param writeLock true select should write lock
* @param limit the limit value, ≤ 0 if no limit clause
* @param offset the offset value, ≤ 0 if no offset clause
*/
void buildSelectSql(StringBuilder sqlBuilder, boolean writeLock, int limit, int offset);
/**
* Creates a select statement string from an inner sql string.
*
* {@code sqlBuilder} is anything as {@code FROM... WHERE... ORDER BY...}.
* It is decorated with a leading {@code SELECT} plus optional clauses
* like for the given parameters.
*
* @param sql the sql without leading {@code SELECT}.
* @param writeLock true select should write lock
* @param limit the limit value, ≤ 0 if no limit clause
* @param offset the offset value, ≤ 0 if no offset clause
* @return the select statement
*/
String buildSelectSql(String sql, boolean writeLock, int limit, int offset);
/**
* Sets optional parameters before applying the original parameters.
*
* @param stmt the prepared statement
* @param limit the limit value, ≤ 0 if no limit clause
* @param offset the offset value, ≤ 0 if no offset clause
* @return the next parameter index
*/
int setLeadingSelectParameters(BackendPreparedStatement stmt, int limit, int offset);
/**
* Sets optional parameters after applying the original parameters.
*
* @param stmt the prepared statement
* @param index the first parameter index
* @param limit the limit value, ≤ 0 if no limit clause
* @param offset the offset value, ≤ 0 if no offset clause
* @return the next parameter index
*/
int setTrailingSelectParameters(BackendPreparedStatement stmt, int index, int limit, int offset);
/**
* Gets the empty string.
* Some dbms (most famous: Oracle) handle empty strings as null.
* In such cases the empty string (e.g. Oracle) may consist of a single blank
* or whatever.
*
* @return the empty string (never null)
*/
String getEmptyString();
/**
* According to the JDBC-specs {@link java.sql.Connection#setAutoCommit}(true)
* should commit, but some backends require an extra {@link java.sql.Connection#commit}.
*
* @return true if the database needs an extra commit
*/
boolean sqlRequiresExtraCommit();
/**
* Determines whether the jdbc driver supports {@link java.sql.ResultSet#isClosed()}.
*
* @return true if the driver supports it
*/
boolean sqlResultSetIsClosedSupported();
/**
* Gets the keyword for the COALESCE function.
*
* @return the keyword
*/
String getCoalesceKeyword();
/**
* Determines whether backend allows expressions referring to tables being updated.
*
* @return true if allowed
*/
boolean allowsExpressionsReferringToTablesBeingUpdated();
/**
* True if backend provides transactionless sequences.
*
* @return true if database supports sequences
*/
boolean supportsSequences();
/**
* Gets the string before the table alias.
* In most databases the " AS " is optional and some
* don't accept it all.
*
* @return the as-string
*/
String sqlAsBeforeTableAlias();
/**
* Returns whether backend needs an alias for a subselect.
*
* @return true if subselect needs an alias.
*/
boolean needAliasForSubselect();
/**
* Creates the SQL string to retrieve the next id from a sequence.
*
* @param name the name of the sequence
* @return the SQL code
*/
String sqlNextFromSequene(String name);
/**
* Create comment sql code that is interpreted as a comment by the backend.
*
* @param text any text, single or multiline
* @return the comment, null if text was null
*/
String sqlComment(String text);
/**
* Creates a join clause.
*
* @param type the join type
* @param joinedTableName the joined tablename
* @param joinedTableAlias the joined table alias, null if none
* @param join the join expression
* @return the sql code
*/
String sqlJoin(JoinType type, String joinedTableName, String joinedTableAlias, String join);
/**
* Creates an sql function expression.
*
* Example:
*
* sqlFunction("max", CN_ID) --> "MAX(id)"
*
*
* @param functionName the function name, will be translated to uppercase
* @param expression the expression, may be null
* @return the sql code
*/
String sqlFunction(String functionName, String expression);
/**
* Checks whether we need a workaround for the (Ingres) setLong-Bug.
*
* @return true if workaround needed
*/
boolean needSetLongWorkaround();
/**
* Checks for the (postgres) bug that fetchsize is ignored if not within a new transaction.
*
* @return true if start tx
*/
boolean needTxForFetchsize();
/**
* Determines whether exception is a constraint violation.
*
* @param ex the exception
* @return true if constraint violation
*/
boolean isConstraintException(SQLException ex);
/**
* Determines whether exception is a communication error.
*
* @param ex the exception
* @return true if comlink down or alike
*/
boolean isCommunicationLinkException(SQLException ex);
/**
* Determines whether exception is transient and retrying the transaction may succeed.
* Typical transient exceptions are thrown when a deadlock is detected or when serialized transaction isolation is used.
*
* Other transient errors are not covered by this method (e.g. connection timeouts, etc...).
*
* @param ex the exception
* @return true if retrying the transaction may succeed
*/
boolean isTransientTransactionException(SQLException ex);
/**
* Returns the maximum size for a given SQL-type.
*
* @param sqlType the SQL-type
* @return the maximum size, 0 if unlimited, -1 if type without size
*/
int getMaxSize(SqlType sqlType);
/**
* Returns the maximum scale for a given SQL-type and size.
*
* @param sqlType the SQL-type
* @param size the size, 0 if unlimited
* @return the maximum scale, 0 if unlimited
*/
int getMaxScale(SqlType sqlType, int size);
/**
* Gets the default size if no size given in model.
*
* @param sqlType the SQL-type
* @return the default size, 0 if no default size
*/
int getDefaultSize(SqlType sqlType);
/**
* Gets the default schema name.
* Some backends store the objects in a default schema, if no explicit schema is given.
*
* @return the defailt schema, null if none
*/
String getDefaultSchema();
/**
* Gets the list of reserved words for this backend.
*
* @return the list of reserved words
*/
Set getReservedWords();
/**
* Asserts that given string is a valid name and usage.
*
* @param nameType the type/usage of the name
* @param name the name
* @throws BackendException if invalid name
*/
void assertValidName(SqlNameType nameType, String name);
/**
* Determines the unique id or name used by the backend for a given connection.
*
* Useful to figure out the corresponding {@code ManagedConnection} from the backend's logfiles.
*
* @param connection the jdbc connection
* @return the backend id, null if none
*/
String getBackendId(Connection connection);
/**
* Retrieves the metadata.
*
* @param metaData the meta data for the whole database
* @param schemas the optional schemas to filter tables, null if no filter
* @param tableNames the tables of the model
* @return the meta data, null if no such table
*/
ModelMetaData getModelMetaData(DatabaseMetaData[] metaData, String[] schemas, String... tableNames);
/**
* Creates a column meta data instance.
*
* @param tableMetaData the table meta data this column belongs to
* @return the meta data
*/
ColumnMetaData createColumnMetaData(TableMetaData tableMetaData);
/**
* Creates a meta data instance.
*
* @param metaData the whole meta data
* @param tableName the model's table name
* @return the meta data
*/
TableMetaData createTableMetaData(ModelMetaData metaData, String tableName);
/**
* Creates an index meta data instance.
*
* @param tableMetaData the table meta data this index belongs to
* @return the meta data
*/
IndexMetaData createIndexMetaData(TableMetaData tableMetaData);
/**
* Creates an index column meta data instance.
*
* @param indexMetaData the meta meta data this column belongs to
* @return the meta data
*/
IndexColumnMetaData createIndexColumnMetaData(IndexMetaData indexMetaData);
/**
* Converts the java SQL-type to the database type name.
*
* @param sqlType the java sql type
* @param size the column's size
* @return the corresponding type string
*/
String sqlTypeToString(SqlType sqlType, int size);
/**
* Converts an sqltype, size and scale to a database type declaration.
*
* @param sqlType the SQL type
* @param size the size
* @param scale the scale
* @return the type definition
*/
String columnTypeToString(SqlType sqlType, int size, int scale);
/**
* Converts an sqltype, size, scale, nullable and default value to a database type declaration.
*
* @param columnName the database column name
* @param sqlType the JDBC sql type
* @param size the optional size
* @param scale the optional scale
* @param nullable true if NULL, else NOT NULL
* @param defaultValue the optional default value
* @return the SQL code
*/
String columnTypeNullDefaultToString(String columnName, SqlType sqlType, int size, int scale,
boolean nullable, Object defaultValue);
/**
* Conberts a type and value to a literal string.
*
* @param sqlType the sql type
* @param value the value
* @return the constant
*/
String valueToLiteral(SqlType sqlType, Object value);
/**
* Generates the first line of a CREATE TABLE statement.
*
* @param tableName the tablename with optional schema separated by a dot
* @param comment optional comment, null if none
* @return the SQL code including the opening bracket
*/
String sqlCreateTableIntro(String tableName, String comment);
/**
* Generates the last line of a CREATE TABLE statement.
*
* @param tableName the tablename with optional schema separated by a dot
* @param comment optional comment, null if none
* @return the SQL code including the closing bracket
*/
String sqlCreateTableClosing(String tableName, String comment);
/**
* Generates SQL code to create the comment for a table.
*
* @param tableName the table name
* @param comment optional comment, null if none
* @return the SQL code, empty string if comment is created via {@link #sqlCreateTableIntro} or {@link #sqlCreateTableClosing}
*/
String sqlCreateTableComment(String tableName, String comment);
/**
* Generates SQL code to alter the comment for a table.
*
* @param tableName the table name
* @param comment optional comment, null to clear
* @return the SQL code
*/
String sqlAlterTableComment(String tableName, String comment);
/**
* Generates the attribute definition of a CREATE TABLE statement.
*
* @param columnName the database column name
* @param comment optional comment, null if none
* @param sqlType the JDBC sql type
* @param size the optional size
* @param scale the optional scale
* @param nullable true if NULL, else NOT NULL
* @param defaultValue the optional default value
* @param primaryKey true if this is a primary key
* @param withTrailingComma true if append a comma
* @return the SQL code
*/
String sqlCreateColumn(String columnName, String comment, SqlType sqlType, int size, int scale, boolean nullable,
Object defaultValue, boolean primaryKey, boolean withTrailingComma);
/**
* Checks whether the column's default corresponds to the model's default value.
*
* @param column the column to inspect
* @param sqlType the sql type
* @param defaultValue the model's default value
* @return true if same
*/
boolean isDefaultEqual(ColumnMetaData column, SqlType sqlType, Object defaultValue);
/**
* Determines the best migration strategy.
*
* @param column old column meta data
* @param columnName new column name
* @param comment new comment
* @param sqlType new sql type
* @param size new size
* @param scale new scale
* @param nullable new nullable
* @param defaultValue new default
* @return the strategies in order to achieve the migration
*/
MigrationStrategy[] getMigrationStrategy(ColumnMetaData column, String columnName, String comment, SqlType sqlType,
int size, int scale, boolean nullable, Object defaultValue);
/**
* Generate sql code to rename a table.
*
* @param tableName the old tablename (with leading schema, if any)
* @param newTableName the new tablename (without schema)
* @return the SQL code
*/
String sqlRenameTable(String tableName, String newTableName);
/**
* Generates sql code to rename a column.
*
* @param tableName the tablename
* @param oldColumnName the old column name
* @param newColumnName the new column name
* @return the SQL code, null if need full spec sqlRenameAndAlterColumnType below
*/
String sqlRenameColumn(String tableName, String oldColumnName, String newColumnName);
/**
* Generates sql code to rename an index.
*
* @param tableName the tablename
* @param oldIndexName the old column name
* @param newIndexName the new column name
* @return the SQL code, null if not supported by the backend and we need to drop and create
*/
String sqlRenameIndex(String tableName, String oldIndexName, String newIndexName);
/**
* Generates sql code to rename a column.
*
* @param tableName the tablename
* @param oldColumnName the old column name
* @param newColumnName the new column name
* @param comment optional comment, null if none
* @param sqlType the JDBC sql type
* @param size the optional size
* @param scale the optional scale
* @param nullable true if NULL, else NOT NULL
* @param defaultValue the optional default value
* @return the SQL code
*/
String sqlRenameAndAlterColumnType(String tableName, String oldColumnName, String newColumnName, String comment, SqlType sqlType,
int size, int scale, boolean nullable, Object defaultValue);
/**
* Generates sql code to add a column.
*
* @param tableName the tablename
* @param columnName the new column name
* @param comment optional comment, null if none
* @param sqlType the JDBC sql type
* @param size the optional size
* @param scale the optional scale
* @param nullable true if NULL, else NOT NULL
* @param defaultValue the optional default value
* @return the SQL code
*/
String sqlAddColumn(String tableName, String columnName, String comment, SqlType sqlType,
int size, int scale, boolean nullable, Object defaultValue);
/**
* Generates sql code to drop a column.
*
* @param tableName the tablename
* @param columnName the new column name
* @return the SQL code
*/
String sqlDropColumn(String tableName, String columnName);
/**
* Generates sql code to change the datatype of a column.
*
* @param tableName the tablename
* @param columnName the new column name
* @param comment optional comment, null if none
* @param sqlType the JDBC sql type
* @param size the optional size
* @param scale the optional scale
* @param nullable true if NULL, else NOT NULL
* @param defaultValue the optional default value
* @return the SQL code
*/
String sqlAlterColumnType(String tableName, String columnName, String comment, SqlType sqlType, int size, int scale, boolean nullable, Object defaultValue);
/**
* Generates code to update a column to a non-null value.
*
* @param tableName the tablename
* @param columnName the column name
* @param sqlType the sql type
* @param defaultValue the optional default value if defined in the model
* @return the SQL code
*/
String sqlUpdateToNotNull(String tableName, String columnName, SqlType sqlType, Object defaultValue);
/**
* Generates sql code to change the null-constraint of a column.
*
* @param tableName the tablename
* @param columnName the new column name
* @param nullable true if NULL, else NOT NULL
* @return the SQL code, null if need {@link #sqlAlterColumnType}
*/
String sqlAlterColumnNullConstraint(String tableName, String columnName, boolean nullable);
/**
* Generates sql code to change the default value a column.
*
* @param tableName the tablename
* @param columnName the new column name
* @param sqlType the JDBC sql type
* @param defaultValue the optional default value
* @return the SQL code, null if need {@link #sqlAlterColumnType}
*/
String sqlAlterColumnDefault(String tableName, String columnName, SqlType sqlType, Object defaultValue);
/**
* Generates SQL code to create the comment for an attribute.
*
* @param tableName the table name
* @param columnName the column name
* @param comment optional comment, null if none
* @return the SQL code, empty string if comment is created via {@link #sqlCreateColumn}
*/
String sqlCreateColumnComment(String tableName, String columnName, String comment);
/**
* Generates the CREATE INDEX statement.
*
* @param tableName the table name
* @param indexName the name of the index
* @param unique true if index is unique
* @param filterCondition the filter condition (null if none)
* @param columnNames the column names (with a leading '-' if descending). Simple function-based indexes are also supported.
* @return the SQL code
*/
String sqlCreateIndex(String tableName, String indexName, boolean unique, String filterCondition, String... columnNames);
/**
* Generates the DROP INDEX statement.
*
* @param schemaName the optional schema, null if none
* @param tableNameWithoutSchema the table name without the schema
* @param indexName the name of the index
* @return the SQL code
*/
String sqlDropIndex(String schemaName, String tableNameWithoutSchema, String indexName);
/**
* Generates the DROP TABLE statement.
*
* @param schemaName the optional schema, null if none
* @param tableNameWithoutSchema the table name without the schema
* @return the SQL code
*/
String sqlDropTable(String schemaName, String tableNameWithoutSchema);
/**
* Generates the ALTER TABLE statement to add a foreign key constraint.
*
* @param referencingTableName the referencing foreign table name
* @param referencingColumnName the referencing foreign column name
* @param referencedTableName the referenced primary table name
* @param referencedColumnName the referenced primary column name
* @param foreignKeyName the name of the foreign key
* @param composite true if referencing table is a component of the referenced table
* @return the SQL code
*/
String sqlCreateForeignKey(String referencingTableName, String referencingColumnName,
String referencedTableName, String referencedColumnName,
String foreignKeyName, boolean composite);
/**
* Generates the sql statement to drop a foreign key constraint.
*
* @param referencingTableName the referencing foreign table name
* @param foreignKeyName the name of the foreign key
* @return the SQL code
*/
String sqlDropForeignKey(String referencingTableName, String foreignKeyName);
/**
* Generates SQL code to alter the comment for an attribute.
*
* @param tableName the table name
* @param columnName the column name
* @param comment optional comment, null to clear
* @return the SQL code, null if use {@link #sqlRenameAndAlterColumnType} instead
*/
String sqlAlterColumnComment(String tableName, String columnName, String comment);
/**
* Generate SQL code for joining a table to an existing select.
*
* @param type the join type
* @param addColumns true if columns of joined table should be added to the result set
* @param select the original select statement
* @param joinSelect the select to join with the original sql or just a tablename
* @param joinSelectIdAlias extra id alias to add to the joined select, null if none
* @param joinAlias the alias of the joined select
* @param join the join clause
*/
void sqlJoinSelects(JoinType type, boolean addColumns, StringBuilder select,
String joinSelect, String joinSelectIdAlias, String joinAlias, String join);
/**
* Generate SQL code for joining a table to an existing select.
*
* @param type the join type
* @param addColumns true if columns of joined table should be added to the result set
* @param select the original select statement
* @param joinSelect the select to join with the original sql or just a tablename
* @param joinSelectIdAlias extra id alias to add to the joined select, null if none
* @param joinAlias the alias of the joined select
* @param join the join clause
* @return the select statement
*/
String sqlJoinSelects(JoinType type, boolean addColumns, String select,
String joinSelect, String joinSelectIdAlias, String joinAlias, String join);
/**
* Converts the JDBC data type integer to a tentackle backend SqlTypes.
*
* There may be more than one sqltype returned!
*
* @param jdbcType the jdbc data type
* @param size the column size
* @param scale the column's scale
* @return the SqlTypes, empty array if no mapping available or no exact match (not generated by TT)
* @see java.sql.Types
*/
SqlType[] jdbcTypeToSqlType(int jdbcType, int size, int scale);
/**
* Gets the table meta data for a given table name.
*
* @param modelMetaData the model the table belongs to
* @param tableName the model's table name
* @return the table data
*/
TableMetaData getTableMetaData(ModelMetaData modelMetaData, String tableName);
/**
* Converts a string to a string enclosed in single quotes.
*
* @param str the string
* @return the quoted string
*/
String toQuotedString(String str);
/**
* Optimize SQL code.
* Replace WHERE 1=1 AND/OR to WHERE.
* Any remaining WHERE 1=1 will be removed too.
* If you don't want your statements getting optimized, use lowercase for those keywords.
*
* @param sql the original sql code
* @return the optimized sql code
*/
String optimizeSql(String sql);
/**
* Returns whether the backend supports releasing savepoints explicitly.
* If not, the savepoints are released when the transaction finishs.
*
* @return true if release is supported, else false
*/
boolean isReleaseSavepointSupported();
/**
* Returns whether the backend support CLOB types.
* If not, it will be emulated as VARCHAR with the maximum possible size.
*
* @return true if supported, false if treat as varchar
*/
boolean isClobSupported();
/**
* Returns whether function based indexes are supported.
*
* @return true if supported
*/
boolean isFunctionBasedIndexSupported();
/**
* Returns whether backend supports filtered indexes.
*
* @return true if supported, false if model will raise an error if filtered index is used
*/
boolean isFilteredIndexSupported();
/**
* Some database support drop index/constraint/column IF EXISTS.
* This may be useful if migration scripts are generated against non-production databases
* that contain test indexes etc...
* Notice, that those temporary DDL changes should better use the temporary prefix (see {@link #isTemporaryName(String)} in
* order to be ignored by the migrator.
*
* @param dropIfExists true if use IF EXISTS if the backend supports it
*/
void setDropIfExistsEnabled(boolean dropIfExists);
/**
* Returns whether backend should add IF EXISTS for generated DROPs.
*
* @return true if IF EXISTS is turned on and supported, false if not supported or turned off
*/
boolean isDropIfExistsEnabled();
/**
* Converts a backend specific type name to an internal name used by driver specific methods.
*
* @param sqlTypeName the original type used in SQL scripts
* @return the JDBC internal name
*/
String toInternalType(String sqlTypeName);
/**
* Returns whether the backend supports given array operator.
*
* @param operator the array operator
* @return true if supported
*/
boolean isArrayOperatorSupported(String operator);
/**
* Sets an array parameter in a prepared statement.
*
* @param statement the prepared statement
* @param pos the parameter position (starting at 1)
* @param type the element's SQL type
* @param elements the elements to be converted to an array parameter
* @param operator the array operator
*/
void setArray(PreparedStatement statement, int pos, SqlType type, Collection elements, String operator) throws SQLException;
}