Database Templates

/**
 * Base class for all database-specific SQL templates
 */
public abstract class SQLTemplates {
    /**
     * Gets the SQL type name for a JDBC type code
     * @param code JDBC type code
     * @return SQL type name for this database
     */
    public String getTypeNameForCode(int code);
    
    /**
     * Checks if this database supports SQL arrays
     * @return true if arrays are supported
     */
    public boolean isArraysSupported();
    
    /**
     * Checks if LIMIT/OFFSET clauses are supported
     * @return true if LIMIT/OFFSET is supported
     */
    public boolean isLimitOffsetSupported();
    
    /**
     * Checks if batch operations are supported
     * @return true if batch operations are supported
     */
    public boolean isBatchSupported();
    
    /**
     * Gets the quote character for identifiers
     * @return Quote character (usually " or `)
     */
    public char getQuoteChar();
    
    /**
     * Checks if identifiers should be quoted
     * @return true if identifiers need quoting
     */
    public boolean isQuoteIdentifiers();
}

/**
 * PostgreSQL database templates with advanced feature support
 */
public class PostgreSQLTemplates extends SQLTemplates {
    /**
     * Creates PostgreSQL templates with default configuration
     */
    public PostgreSQLTemplates();
    
    /**
     * Creates PostgreSQL templates with custom quote character
     * @param quote Character to use for quoting identifiers
     */
    public PostgreSQLTemplates(char quote);
    
    /**
     * Creates a builder for configuring PostgreSQL templates
     * @return Template builder
     */
    public static Builder builder();
    
    /**
     * Builder for PostgreSQL template configuration
     */
    public static class Builder {
        public Builder quote(char quote);
        public Builder escape(char escape);
        public Builder printSchema();
        public Builder useSchema(String schema);
        public PostgreSQLTemplates build();
    }
}

// Default PostgreSQL templates
SQLTemplates templates = PostgreSQLTemplates.builder().build();

// PostgreSQL with custom configuration
SQLTemplates templates = PostgreSQLTemplates.builder()
    .quote('"')
    .printSchema()
    .useSchema("public")
    .build();

// Configuration with templates
Configuration config = new Configuration(templates);
SQLQueryFactory queryFactory = new SQLQueryFactory(config, dataSource);

/**
 * MySQL database templates with MySQL-specific optimizations
 */
public class MySQLTemplates extends SQLTemplates {
    /**
     * Creates MySQL templates with default configuration
     */
    public MySQLTemplates();
    
    /**
     * Creates MySQL templates with custom quote character
     * @param quote Character to use for quoting identifiers
     */
    public MySQLTemplates(char quote);
    
    /**
     * Creates a builder for configuring MySQL templates
     * @return Template builder
     */
    public static Builder builder();
}

/**
 * Oracle database templates with Oracle-specific features
 */
public class OracleTemplates extends SQLTemplates {
    /**
     * Creates Oracle templates with default configuration
     */
    public OracleTemplates();
    
    /**
     * Creates a builder for configuring Oracle templates
     * @return Template builder
     */
    public static Builder builder();
}

/**
 * Base SQL Server templates
 */
public class SQLServerTemplates extends SQLTemplates;

/**
 * SQL Server 2005 specific templates
 */
public class SQLServer2005Templates extends SQLServerTemplates;

/**
 * SQL Server 2008 specific templates with enhanced features
 */
public class SQLServer2008Templates extends SQLServer2005Templates;

/**
 * SQL Server 2012 templates with additional T-SQL features
 */
public class SQLServer2012Templates extends SQLServer2008Templates;

/**
 * H2 database templates
 */
public class H2Templates extends SQLTemplates;

/**
 * HSQLDB database templates
 */
public class HSQLDBTemplates extends SQLTemplates;

/**
 * Apache Derby templates
 */
public class DerbyTemplates extends SQLTemplates;

/**
 * IBM DB2 templates
 */
public class DB2Templates extends SQLTemplates;

/**
 * SQLite templates
 */
public class SQLiteTemplates extends SQLTemplates;

/**
 * Firebird database templates
 */
public class FirebirdTemplates extends SQLTemplates;

/**
 * CUBRID database templates
 */
public class CUBRIDTemplates extends SQLTemplates;

/**
 * Teradata database templates
 */
public class TeradataTemplates extends SQLTemplates;

/**
 * PostgreSQL-optimized query factory
 */
public class PostgreSQLQueryFactory extends AbstractSQLQueryFactory<PostgreSQLQuery<?>> {
    public PostgreSQLQueryFactory(Configuration configuration, DataSource dataSource);
    public PostgreSQLQuery<?> query();
}

/**
 * MySQL-optimized query factory
 */
public class MySQLQueryFactory extends AbstractSQLQueryFactory<MySQLQuery<?>> {
    public MySQLQueryFactory(Configuration configuration, DataSource dataSource);
    public MySQLQuery<?> query();
    public MySQLReplaceClause replace(RelationalPath<?> path);
}

/**
 * Oracle-optimized query factory
 */
public class OracleQueryFactory extends AbstractSQLQueryFactory<OracleQuery<?>> {
    public OracleQueryFactory(Configuration configuration, DataSource dataSource);
    public OracleQuery<?> query();
}

/**
 * SQL Server-optimized query factory
 */
public class SQLServerQueryFactory extends AbstractSQLQueryFactory<SQLServerQuery<?>> {
    public SQLServerQueryFactory(Configuration configuration, DataSource dataSource);
    public SQLServerQuery<?> query();
}

/**
 * PostgreSQL query with PostgreSQL-specific features
 */
public class PostgreSQLQuery<T> extends AbstractPostgreSQLQuery<T, PostgreSQLQuery<T>> {
    public PostgreSQLQuery(Connection conn, PostgreSQLTemplates templates);
    public PostgreSQLQuery<T> forShare();
    public PostgreSQLQuery<T> forUpdate();
}

/**
 * MySQL query with MySQL-specific features
 */
public class MySQLQuery<T> extends AbstractMySQLQuery<T, MySQLQuery<T>> {
    public MySQLQuery(Connection conn, MySQLTemplates templates);
    public MySQLQuery<T> straightJoin();
    public MySQLQuery<T> forUpdate();
}

/**
 * Oracle query with Oracle-specific features
 */
public class OracleQuery<T> extends AbstractOracleQuery<T, OracleQuery<T>> {
    public OracleQuery(Connection conn, OracleTemplates templates);
    public OracleQuery<T> hint(String hint);
    public OracleQuery<T> connectBy(Predicate cond);
}

/**
 * SQL Server query with T-SQL features
 */
public class SQLServerQuery<T> extends AbstractSQLServerQuery<T, SQLServerQuery<T>> {
    public SQLServerQuery(Connection conn, SQLServerTemplates templates);
    public SQLServerQuery<T> tableHints(SQLServerTableHints... hints);
    public SQLServerQuery<T> with(String... options);
}

/**
 * Registry for database-specific SQL templates
 */
public class SQLTemplatesRegistry {
    /**
     * Gets templates for a specific database based on connection metadata
     * @param connection Database connection
     * @return Appropriate SQL templates for the database
     */
    public static SQLTemplates getTemplates(Connection connection);
    
    /**
     * Gets templates by database product name
     * @param productName Database product name
     * @return Appropriate SQL templates
     */
    public static SQLTemplates getTemplates(String productName);
    
    /**
     * Registers custom templates for a database product
     * @param productName Database product name
     * @param templates SQL templates to register
     */
    public static void register(String productName, SQLTemplates templates);
}

// Automatic template detection
Connection connection = dataSource.getConnection();
SQLTemplates templates = SQLTemplatesRegistry.getTemplates(connection);
Configuration config = new Configuration(templates);

// Manual template selection by product name
SQLTemplates templates = SQLTemplatesRegistry.getTemplates("PostgreSQL");

// Register custom templates
class CustomPostgreSQLTemplates extends PostgreSQLTemplates {
    // Custom implementation
}

SQLTemplatesRegistry.register("PostgreSQL", new CustomPostgreSQLTemplates());

/**
 * MySQL-specific REPLACE operation
 */
public class MySQLReplaceClause extends AbstractSQLInsertClause<MySQLReplaceClause> {
    public MySQLReplaceClause(Connection conn, MySQLTemplates templates, RelationalPath<?> entity);
    public <T> MySQLReplaceClause set(Path<T> path, T value);
    public long execute();
}

/**
 * SQL Server table hints enumeration
 */
public enum SQLServerTableHints {
    NOLOCK, READUNCOMMITTED, UPDLOCK, REPEATABLEREAD, 
    SERIALIZABLE, READCOMMITTED, TABLOCK, TABLOCKX,
    PAGLOCK, ROWLOCK, NOWAIT, READPAST, XLOCK, SNAPSHOT
}

/**
 * Teradata-specific query band support
 */
public class SetQueryBandClause {
    public SetQueryBandClause for(String target);
    public SetQueryBandClause set(String key, String value);
    public void execute();
}

// MySQL REPLACE operation
MySQLQueryFactory mysqlFactory = new MySQLQueryFactory(config, dataSource);
mysqlFactory
    .replace(qUser)
    .set(qUser.name, "John Doe")  
    .set(qUser.email, "john@example.com")
    .execute();

// SQL Server with table hints
SQLServerQueryFactory sqlServerFactory = new SQLServerQueryFactory(config, dataSource);
List<User> users = sqlServerFactory
    .selectFrom(qUser)
    .tableHints(SQLServerTableHints.NOLOCK)
    .fetch();

// Oracle with hints
OracleQueryFactory oracleFactory = new OracleQueryFactory(config, dataSource);
List<User> users = oracleFactory
    .selectFrom(qUser)
    .hint("/*+ INDEX(user, user_email_idx) */")
    .fetch();

/**
 * Template builder pattern for configuration
 */
public static class TemplateBuilder {
    /**
     * Sets the quote character for identifiers
     * @param quote Quote character
     * @return Builder for method chaining
     */
    public TemplateBuilder quote(char quote);
    
    /**
     * Sets the escape character
     * @param escape Escape character
     * @return Builder for method chaining
     */
    public TemplateBuilder escape(char escape);
    
    /**
     * Enables schema printing in SQL
     * @return Builder for method chaining
     */
    public TemplateBuilder printSchema();
    
    /**
     * Sets default schema for operations
     * @param schema Schema name
     * @return Builder for method chaining
     */
    public TemplateBuilder useSchema(String schema);
    
    /**
     * Builds the configured templates
     * @return Configured SQL templates
     */
    public SQLTemplates build();
}

// Custom PostgreSQL configuration
PostgreSQLTemplates templates = PostgreSQLTemplates.builder()
    .quote('`')                    // Use backticks instead of quotes
    .printSchema()                 // Include schema in SQL
    .useSchema("app_schema")       // Default schema
    .build();

// H2 configuration for testing
H2Templates h2Templates = H2Templates.builder()
    .quote('"')
    .build();

// SQL Server with custom settings
SQLServerTemplates sqlServerTemplates = SQLServerTemplates.builder()
    .quote('[')                    // Use square brackets
    .escape(']')
    .build();