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/*
* Copyright 2004-2011 H2 Group.
* Copyright 2011 James Moger.
* Copyright 2012 Frédéric Gaillard.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.iciql;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.MessageFormat;
import java.text.SimpleDateFormat;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import com.iciql.Iciql.ConstraintDeleteType;
import com.iciql.Iciql.ConstraintUpdateType;
import com.iciql.Iciql.DataTypeAdapter;
import com.iciql.Iciql.Mode;
import com.iciql.TableDefinition.ConstraintForeignKeyDefinition;
import com.iciql.TableDefinition.ConstraintUniqueDefinition;
import com.iciql.TableDefinition.FieldDefinition;
import com.iciql.TableDefinition.IndexDefinition;
import com.iciql.util.IciqlLogger;
import com.iciql.util.StatementBuilder;
import com.iciql.util.StringUtils;
import com.iciql.util.Utils;
/**
* Default implementation of an SQL dialect.
*/
public class SQLDialectDefault implements SQLDialect {
final String LITERAL = "'";
float databaseVersion;
int databaseMajorVersion;
int databaseMinorVersion;
String databaseName;
String productVersion;
Mode mode;
Map<Class<? extends DataTypeAdapter<?>>, DataTypeAdapter<?>> typeAdapters;
public SQLDialectDefault() {
typeAdapters = new ConcurrentHashMap<Class<? extends DataTypeAdapter<?>>, DataTypeAdapter<?>>();
}
@Override
public String toString() {
return getClass().getName() + ": " + databaseName + " " + productVersion;
}
@Override
public void configureDialect(Db db) {
Connection conn = db.getConnection();
DatabaseMetaData data = null;
try {
data = conn.getMetaData();
databaseName = data.getDatabaseProductName();
databaseMajorVersion = data.getDatabaseMajorVersion();
databaseMinorVersion = data.getDatabaseMinorVersion();
databaseVersion = Float.parseFloat(databaseMajorVersion + "."
+ databaseMinorVersion);
productVersion = data.getDatabaseProductVersion();
} catch (SQLException e) {
throw new IciqlException(e, "failed to retrieve database metadata!");
}
mode = db.getMode();
}
@Override
public boolean supportsSavePoints() {
return true;
}
/**
* Allows subclasses to change the type of a column for a CREATE statement.
*
* @param sqlType
* @return the SQL type or a preferred alternative
*/
@Override
public String convertSqlType(String sqlType) {
return sqlType;
}
@Override
public Class<? extends java.util.Date> getDateTimeClass() {
return java.util.Date.class;
}
@Override
public String prepareTableName(String schemaName, String tableName) {
if (StringUtils.isNullOrEmpty(schemaName)) {
return tableName;
}
return schemaName + "." + tableName;
}
@Override
public String prepareColumnName(String name) {
return name;
}
@Override
public <T> void prepareDropTable(SQLStatement stat, TableDefinition<T> def) {
StatementBuilder buff = new StatementBuilder("DROP TABLE IF EXISTS "
+ prepareTableName(def.schemaName, def.tableName));
stat.setSQL(buff.toString());
return;
}
protected <T> String prepareCreateTable(TableDefinition<T> def) {
return "CREATE TABLE";
}
@Override
public <T> void prepareCreateTable(SQLStatement stat, TableDefinition<T> def) {
StatementBuilder buff = new StatementBuilder();
buff.append(prepareCreateTable(def));
buff.append(" ");
buff.append(prepareTableName(def.schemaName, def.tableName)).append('(');
boolean hasIdentityColumn = false;
for (FieldDefinition field : def.fields) {
buff.appendExceptFirst(", ");
buff.append(prepareColumnName(field.columnName)).append(' ');
String dataType = field.dataType;
if (dataType.equals("VARCHAR")) {
// check to see if we should use VARCHAR or CLOB
if (field.length <= 0) {
dataType = "CLOB";
}
buff.append(convertSqlType(dataType));
if (field.length > 0) {
buff.append('(').append(field.length).append(')');
}
} else if (dataType.equals("DECIMAL")) {
// DECIMAL(precision,scale)
buff.append(convertSqlType(dataType));
if (field.length > 0) {
buff.append('(').append(field.length);
if (field.scale > 0) {
buff.append(',').append(field.scale);
}
buff.append(')');
}
} else {
// other
hasIdentityColumn |= prepareColumnDefinition(buff, convertSqlType(dataType),
field.isAutoIncrement, field.isPrimaryKey);
}
// default values
if (!field.isAutoIncrement && !field.isPrimaryKey) {
String dv = field.defaultValue;
if (!StringUtils.isNullOrEmpty(dv)) {
if (ModelUtils.isProperlyFormattedDefaultValue(dv)
&& ModelUtils.isValidDefaultValue(field.field.getType(), dv)) {
buff.append(" DEFAULT " + dv);
}
}
}
if (!field.nullable) {
buff.append(" NOT NULL");
}
}
// if table does not have identity column then specify primary key
if (!hasIdentityColumn) {
if (def.primaryKeyColumnNames != null && def.primaryKeyColumnNames.size() > 0) {
buff.append(", PRIMARY KEY(");
buff.resetCount();
for (String n : def.primaryKeyColumnNames) {
buff.appendExceptFirst(", ");
buff.append(prepareColumnName(n));
}
buff.append(')');
}
}
// create unique constraints
if (def.constraintsUnique.size() > 0) {
buff.append(", ");
buff.resetCount();
for (ConstraintUniqueDefinition constraint : def.constraintsUnique) {
buff.append("CONSTRAINT ");
buff.append(constraint.constraintName);
buff.append(" UNIQUE ");
buff.append(" (");
for (String col : constraint.uniqueColumns) {
buff.appendExceptFirst(", ");
buff.append(prepareColumnName(col));
}
buff.append(") ");
}
}
// create foreign key constraints
if (def.constraintsForeignKey.size() > 0) {
buff.append(", ");
buff.resetCount();
for (ConstraintForeignKeyDefinition constraint : def.constraintsForeignKey) {
buff.appendExceptFirst(", ");
buff.append(String.format("CONSTRAINT %s FOREIGN KEY(%s) REFERENCES %s(%s)",
constraint.constraintName,
constraint.foreignColumns.get(0),
constraint.referenceTable,
constraint.referenceColumns.get(0)));
if (constraint.deleteType != ConstraintDeleteType.UNSET) {
buff.append(" ON DELETE ");
switch (constraint.deleteType) {
case CASCADE:
buff.append("CASCADE ");
break;
case RESTRICT:
buff.append("RESTRICT ");
break;
case SET_NULL:
buff.append("SET NULL ");
break;
case NO_ACTION:
buff.append("NO ACTION ");
break;
case SET_DEFAULT:
buff.append("SET DEFAULT ");
break;
}
}
if (constraint.updateType != ConstraintUpdateType.UNSET) {
buff.append(" ON UPDATE ");
switch (constraint.updateType) {
case CASCADE:
buff.append("CASCADE ");
break;
case RESTRICT:
buff.append("RESTRICT ");
break;
case SET_NULL:
buff.append("SET NULL ");
break;
case NO_ACTION:
buff.append("NO ACTION ");
break;
case SET_DEFAULT:
buff.append("SET DEFAULT ");
break;
}
}
switch (constraint.deferrabilityType) {
case DEFERRABLE_INITIALLY_DEFERRED:
buff.append("DEFERRABLE INITIALLY DEFERRED ");
break;
case DEFERRABLE_INITIALLY_IMMEDIATE:
buff.append("DEFERRABLE INITIALLY IMMEDIATE ");
break;
case NOT_DEFERRABLE:
buff.append("NOT DEFERRABLE ");
break;
case UNSET:
break;
}
}
}
buff.append(')');
stat.setSQL(buff.toString());
}
@Override
public <T> void prepareDropView(SQLStatement stat, TableDefinition<T> def) {
StatementBuilder buff = new StatementBuilder("DROP VIEW "
+ prepareTableName(def.schemaName, def.tableName));
stat.setSQL(buff.toString());
return;
}
protected <T> String prepareCreateView(TableDefinition<T> def) {
return "CREATE VIEW";
}
@Override
public <T> void prepareCreateView(SQLStatement stat, TableDefinition<T> def) {
StatementBuilder buff = new StatementBuilder();
buff.append(" FROM ");
buff.append(prepareTableName(def.schemaName, def.viewTableName));
StatementBuilder where = new StatementBuilder();
for (FieldDefinition field : def.fields) {
if (!StringUtils.isNullOrEmpty(field.constraint)) {
where.appendExceptFirst(", ");
String col = prepareColumnName(field.columnName);
String constraint = field.constraint.replace("{0}", col).replace("this", col);
where.append(constraint);
}
}
if (where.length() > 0) {
buff.append(" WHERE ");
buff.append(where.toString());
}
prepareCreateView(stat, def, buff.toString());
}
@Override
public <T> void prepareCreateView(SQLStatement stat, TableDefinition<T> def, String fromWhere) {
StatementBuilder buff = new StatementBuilder();
buff.append(prepareCreateView(def));
buff.append(" ");
buff.append(prepareTableName(def.schemaName, def.tableName));
buff.append(" AS SELECT ");
for (FieldDefinition field : def.fields) {
buff.appendExceptFirst(", ");
buff.append(prepareColumnName(field.columnName));
}
buff.append(fromWhere);
stat.setSQL(buff.toString());
}
protected boolean isIntegerType(String dataType) {
if ("INT".equals(dataType)) {
return true;
} else if ("INTEGER".equals(dataType)) {
return true;
} else if ("TINYINT".equals(dataType)) {
return true;
} else if ("SMALLINT".equals(dataType)) {
return true;
} else if ("MEDIUMINT".equals(dataType)) {
return true;
} else if ("BIGINT".equals(dataType)) {
return true;
}
return false;
}
protected boolean prepareColumnDefinition(StatementBuilder buff, String dataType,
boolean isAutoIncrement, boolean isPrimaryKey) {
buff.append(dataType);
if (isAutoIncrement) {
buff.append(" AUTO_INCREMENT");
}
return false;
}
@Override
public void prepareCreateIndex(SQLStatement stat, String schemaName, String tableName,
IndexDefinition index) {
StatementBuilder buff = new StatementBuilder();
buff.append("CREATE ");
switch (index.type) {
case UNIQUE:
buff.append("UNIQUE ");
break;
case UNIQUE_HASH:
buff.append("UNIQUE ");
break;
default:
IciqlLogger.warn("{0} does not support hash indexes", getClass().getSimpleName());
}
buff.append("INDEX ");
buff.append(index.indexName);
buff.append(" ON ");
// FIXME maybe we can use schemaName ?
// buff.append(prepareTableName(schemaName, tableName));
buff.append(tableName);
buff.append("(");
for (String col : index.columnNames) {
buff.appendExceptFirst(", ");
buff.append(prepareColumnName(col));
}
buff.append(") ");
stat.setSQL(buff.toString().trim());
}
/**
* PostgreSQL and Derby do not support the SQL2003 MERGE syntax, but we can
* use a trick to insert a row if it does not exist and call update() in
* Db.merge() if the affected row count is 0.
* <p>
* Databases that do support a MERGE syntax should override this method.
* <p>
* http://stackoverflow.com/questions/407688
*/
@Override
public <T> void prepareMerge(SQLStatement stat, String schemaName, String tableName,
TableDefinition<T> def, Object obj) {
StatementBuilder buff = new StatementBuilder("INSERT INTO ");
buff.append(prepareTableName(schemaName, tableName));
buff.append(" (");
buff.resetCount();
for (FieldDefinition field : def.fields) {
buff.appendExceptFirst(", ");
buff.append(prepareColumnName(field.columnName));
}
buff.append(") (SELECT ");
buff.resetCount();
for (FieldDefinition field : def.fields) {
buff.appendExceptFirst(", ");
buff.append('?');
Object value = def.getValue(obj, field);
Object parameter = serialize(value, field.typeAdapter);
stat.addParameter(parameter);
}
buff.append(" FROM ");
buff.append(prepareTableName(schemaName, tableName));
buff.append(" WHERE ");
buff.resetCount();
for (FieldDefinition field : def.fields) {
if (field.isPrimaryKey) {
buff.appendExceptFirst(" AND ");
buff.append(MessageFormat.format("{0} = ?", prepareColumnName(field.columnName)));
Object value = def.getValue(obj, field);
Object parameter = serialize(value, field.typeAdapter);
stat.addParameter(parameter);
}
}
buff.append(" HAVING count(*)=0)");
stat.setSQL(buff.toString());
}
@Override
public void appendLimitOffset(SQLStatement stat, long limit, long offset) {
if (limit > 0) {
stat.appendSQL(" LIMIT " + limit);
}
if (offset > 0) {
stat.appendSQL(" OFFSET " + offset);
}
}
@Override
public void registerAdapter(DataTypeAdapter<?> typeAdapter) {
typeAdapters.put((Class<? extends DataTypeAdapter<?>>) typeAdapter.getClass(), typeAdapter);
}
@Override
public DataTypeAdapter<?> getAdapter(Class<? extends DataTypeAdapter<?>> typeAdapter) {
DataTypeAdapter<?> dta = typeAdapters.get(typeAdapter);
if (dta == null) {
dta = Utils.newObject(typeAdapter);
typeAdapters.put(typeAdapter, dta);
}
dta.setMode(mode);
return dta;
}
@SuppressWarnings("unchecked")
@Override
public <T> Object serialize(T value, Class<? extends DataTypeAdapter<?>> typeAdapter) {
if (typeAdapter == null) {
// pass-through
return value;
}
DataTypeAdapter<T> dta = (DataTypeAdapter<T>) getAdapter(typeAdapter);
return dta.serialize(value);
}
@Override
public Object deserialize(ResultSet rs, int columnIndex, Class<?> targetType, Class<? extends DataTypeAdapter<?>> typeAdapter) {
if (typeAdapter == null) {
// standard object deserialization
Object value = null;
try {
// use internal Iciql type conversion
Object o = rs.getObject(columnIndex);
if (Clob.class.isAssignableFrom(o.getClass())) {
value = Utils.convert(o, String.class);
} else if (Blob.class.isAssignableFrom(o.getClass())) {
value = Utils.convert(o, byte[].class);
} else {
value = Utils.convert(o, targetType);
}
} catch (SQLException e) {
throw new IciqlException(e, "Can not convert the value at column {0} to {1}",
columnIndex, targetType.getName());
}
return value;
} else {
// custom object deserialization with a DataTypeAdapter
DataTypeAdapter<?> dta = getAdapter(typeAdapter);
Object object = null;
try {
object = rs.getObject(columnIndex);
} catch (SQLException e) {
throw new IciqlException(e, "Can not convert the value at column {0} to {1}",
columnIndex, targetType.getName());
}
Object value = dta.deserialize(object);
return value;
}
}
@Override
public String prepareStringParameter(Object o) {
if (o instanceof String) {
return LITERAL + o.toString().replace(LITERAL, "''") + LITERAL;
} else if (o instanceof Character) {
return LITERAL + o.toString() + LITERAL;
} else if (o instanceof java.sql.Time) {
return LITERAL + new SimpleDateFormat("HH:mm:ss").format(o) + LITERAL;
} else if (o instanceof java.sql.Date) {
return LITERAL + new SimpleDateFormat("yyyy-MM-dd").format(o) + LITERAL;
} else if (o instanceof java.util.Date) {
return LITERAL + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(o) + LITERAL;
}
return o.toString();
}
}
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