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package com.iciql.dialect;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import com.iciql.IciqlException;
import com.iciql.SQLDialect;
import com.iciql.SQLStatement;
import com.iciql.TableDefinition.IndexDefinition;
import com.iciql.util.StringUtils;
/**
* Default implementation of an SQL dialect. Does not support merge nor index
* creation.
*/
public class DefaultSQLDialect implements SQLDialect {
float databaseVersion;
String productName;
String productVersion;
@Override
public String toString() {
return getClass().getName() + ": " + productName + " " + productVersion;
}
@Override
public void configureDialect(Connection conn) {
loadIdentity(conn);
}
protected void loadIdentity(Connection conn) {
try {
DatabaseMetaData data = conn.getMetaData();
databaseVersion = Float.parseFloat(data.getDatabaseMajorVersion() + "."
+ data.getDatabaseMinorVersion());
productName = data.getDatabaseProductName();
productVersion = data.getDatabaseProductVersion();
} catch (SQLException e) {
throw new IciqlException(e);
}
}
@Override
public boolean supportsMemoryTables() {
return false;
}
@Override
public boolean supportsMerge() {
return false;
}
@Override
public boolean supportsLimitOffset() {
return true;
}
@Override
public String prepareTableName(String schema, String table) {
if (StringUtils.isNullOrEmpty(schema)) {
return table;
}
return schema + "." + table;
}
@Override
public String prepareColumnName(String name) {
return name;
}
@Override
public String prepareCreateIndex(String schema, String table, IndexDefinition index) {
throw new IciqlException("Dialect does not support index creation!");
}
@Override
public void appendLimit(SQLStatement stat, long limit) {
stat.appendSQL(" LIMIT " + limit);
}
@Override
public void appendOffset(SQLStatement stat, long offset) {
stat.appendSQL(" OFFSET " + offset);
}
}
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